~~Table~~UNITED ofSTATES ~~Contents~~SECURITIES AND EXCHANGE COMMISSION

~~UNITED~~Washington, ~~STATES SECURITIES~~D.C. ~~AND EXCHANGE COMMISSION~~20549

~~Washington,~~FORM ~~D.C. 20549~~6-K

~~FORM~~REPORT 6OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-K 16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

~~REPORT~~Commission OFfile ~~FOREIGN~~number ~~PRIVATE ISSUER PURSUANT TO RULE 13a~~0-~~16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934~~ 28608

~~Commission~~PETSEC ~~file~~ENERGY ~~number 0-28608~~LTD

~~PETSEC~~(Translation ~~ENERGY~~of ~~LTD~~ registrant’s name into English)

LEVEL 13, 1 ALFRED STREET, SYDNEY, NSW 2000, AUSTRALIA (~~Translation~~Address of ~~registrant’s~~principal ~~name~~executive ~~into English~~offices)

~~LEVEL~~Indicate ~~13,~~by 1check ~~ALFRED~~mark ~~STREET,~~whether ~~SYDNEY,~~the ~~NSW~~registrant ~~2000,~~files ~~AUSTRALIA~~or will file annual reports under ~~(Address~~cover of ~~principal~~Form ~~executive~~20-F ~~offices)~~or Form 40-F. Form 20-F þ Form 40-F o

Indicate by check mark whether the registrant ~~files~~by orfurnishing ~~will~~the ~~file~~information ~~annual~~contained ~~reports~~in ~~under cover~~this of Form ~~20-F~~is oralso ~~Form~~thereby 40furnishing the information to the Commission pursuant to Rule 12g3-F.2(b) under ~~Form~~the ~~20-F~~Securities þExchange ~~Form~~Act ~~40-F~~of 1934. Yes o No þ

~~Indicate by check mark whether the registrant by furnishing the information contained in this~~1 ~~Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934. Yes o No þ~~

~~Table~~ Certain statements in this report regarding future expectations and plans of ~~Contents~~the Company may be regarded as “forward-looking statements” within the meaning of Section 27A of the USA Securities Act of 1933 and Section 21E of the USA Securities Exchange Act of 1934. Although the Company believes that its expectations and plans are based upon reasonable assumptions, it can give no assurance that its goals will be met. Actual results may vary significantly from those anticipated due to many factors, including oil and gas prices, operating hazards, drilling risks, environmental risks and uncertainties in interpreting engineering and other data relating to oil and gas reservoirs, as well as other risks discussed in the Company’s SEC filings.

~~Certain~~The ~~statements~~following inrelease ~~this~~was ~~report~~filed ~~regarding~~with ~~future expectations and plans of~~ the ~~Company may~~Australian beStock ~~regarded as “forward-looking statements” within the meaning of Section 27A of the USA Securities Act of 1933 and Section 21E of the USA Securities~~ Exchange ~~Act~~on ~~of 1934. Although~~ the ~~Company~~ ~~believes~~date ~~that its expectations and plans are based upon reasonable assumptions, it can give no assurance that its goals will be met~~indicated. ~~Actual results may vary significantly from those~~ anticipated due to many factors, including oil and gas prices, operating hazards, drilling risks, environmental risks and uncertainties in interpreting engineering and other data relating to oil and gas reservoirs, as well as other risks discussed in the Company’s SEC filings.

~~The~~PETSEC ~~following~~ENERGY ~~release~~LTD ACN ~~was~~000 ~~filed~~602 ~~with the Australian Stock Exchange on the date indicated.~~700

2REPORT FOR QUARTER ENDED 31 DECEMBER 2005

~~TABLE~~The OFDecember ~~CONTENTS~~quarter has been a significant one for Petsec Energy with the commissioning of its third offshore platform in the Gulf of Mexico, USA – at Main Pass 19 and commencement of a four-well drilling programme on Main Pass 19\18, the first two wells of which have resulted in commercial gas discoveries.

~~Condensed~~The ~~Consolidated~~Company ~~Interim~~is ~~Financial~~well ~~Statements~~placed ~~Commentary on results~~ for ~~announcement~~further ~~Directors~~growth ~~Report~~in production and ~~Condensed~~reserves Consolidated Interim Financial Statements For the period ended 30 June 2005 DIRECTORS REPORT Condensed consolidated interim income statement Condensed consolidated interim balance sheet Condensed consolidated interim statement of changes in ~~equity~~2006 ~~Condensed~~as ~~consolidated~~recent discoveries ~~interim~~are ~~statement~~brought ofinto ~~cash~~production ~~flows~~and ~~Notes~~a toplanned ~~the~~expanded ~~condensed~~drilling ~~consolidated~~programme ~~interim financial statements Directors’ Declaration SIGNATURES~~proceeds.

~~Table of Contents~~HIGHLIGHTS

~~Petsec~~DEVELOPMENT ~~Energy~~– ~~Ltd~~Main Pass 19 Platform installed

~~ACN~~Development ~~000~~of ~~602~~the ~~700~~Main Pass 19 gas field in the Gulf of Mexico, USA was completed with the installation and commissioning of the Main Pass 19 platform during December — the company’s third offshore production facility in the Gulf of Mexico, USA. Production from the new gas field commenced early January 2006 and is currently producing at a rate in excess of 10 million cubic feet of gas a day net to Petsec Energy.

~~Appendix 4D &~~EXPLORATION

~~Condensed~~- ~~Consolidated~~New ~~Interim~~Gas ~~Financial~~Discoveries ~~Statements~~at Main Pass 19

~~For~~The ~~the~~first ~~period~~two ~~ended~~wells 30of ~~June~~a four-well drilling programme which commenced in December, made commercial gas discoveries. The programme is testing 3D seismic mapped potential of approximately 15-18 ~~2005~~billion cubic feet equivalent (“Bcfe”) of gas net to Petsec Energy.

~~(Current~~- ~~period:~~Moonshine ~~Six~~3D ~~months~~seismic ~~ended~~data ~~30 June 2005; previous corresponding period: Six months ended 30 June 2004)~~delivered.

~~Results~~Processed ~~for~~data ~~announcement~~was toreceived in the ~~market~~quarter. Data quality is high and interpretation has commenced.

~~Continued~~PRODUCTION ~~strong~~& ~~growth has resulted in more than doubling of production, revenues and~~CASHFLOW operating cash flows and profits for the first half of financial year 2005 compared to the previous corresponding period. For the current period the consolidated entity recorded a profit after tax of US$7.7 million on EBITDAX of US$27.8 million.

Highlights

•		Production for 2005 year was 6.5 Bcfe up 14% from 5.6 Bcfe for the 2004 year.

•		EBITDAX from normal operations for 2005 was US$38.3 million (A$50.4 million) up 49% from US$25.8 million (A$35.1 million) in 2004. After expensing ineffective gas hedges, 2005 EBITDAX was US$33.7 million (A$44.3 million).

• Total revenues for the first half of the year of US$31.8 million. • Net oil & gas revenues after royalties of US$31.6 million from net production of 4.6 billion cubic feet of gas equivalent (“Bcfe”) at an average price received of US$6.82 per thousand cubic feet of gas equivalent (“Mcfe”). • EBITDAX of US$27.8 million, representing a cash operating profit margin of US$6.00 per Mcfe. • Net operating cash flows of US$24.3 million and net cash invested in exploration and production development activities of US$18.4 million. • Cash at balance date of US$15.6 million. • Profit of US$7. 2 ~~million before tax, and US$7.7 million after tax or 6.4 US cents per share, after the write-off of US$8.4 million in costs associated with drilling at Price Lake in Louisiana.~~

	Six months		Six months		Increase/
	ended		ended		(decrease)
Table	Jun 2005		Jun 2004		%
Net production (MMcfe)		4,637		2,153		115.4
Results in US$
Total revenues (US$m)		31.8		12.0		165.0
Net revenues after royalties (US$m)		31.6		11.9		165.5
EBITDAX (US$m)		27.8		8.8		215.9
Net Profit before Tax (US$m)		7.2		0.5
Net Profit after Tax (US$m)		7.7		0.2
Basic earnings per share (US cents)		6.4		0.1
USD/AUD average exchange rate		0.7731		0.7322
Results in A$
Total revenues (A$m)		41.2		16.4		151.2
Net revenues after royalties (A$m)		40.9		16.3		150.9
EBITDAX (A$m)		36.0		12.0		200.0
Net Profit before Tax (A$m)		9.3		0.7
Net Profit after Tax(A$m)		10.0		0.3
Basic earnings per share (AUD cents)		8.3		0.1

•		Gas Production for the December quarter (& late September quarter) was significantly impacted by Hurricanes Rita and Katrina, which damaged and shut-in third party sales pipeline facilities on the Louisiana coast which caused the Company’s production to be shut-in for much of the quarter.

•		Production for the December quarter was 376 million cubic feet equivalent (“MMcfe”), down from 1,441 MMcfe in the September quarter (also impacted by Hurricanes) and 2,295 MMcfe in the June quarter.

•		Current production is approximately 30 MMcfe/day net to Petsec Energy (announced on 18 January 2006) from Vermilion 258, West Cameron 352/343 and Main Pass 19 gas fields.

3FINANCIAL PERFORMANCE

~~Table~~Net ofproduction ~~Contents~~for the year ended 31 December 2005 was 6,454 MMcfe (up 14% on the prior year) and earnings before interest, tax, DD&A and exploration expenses (“EBITDAX”) from normal operations (before derivative loss on ineffective forward hedge contracts) was US$38.3 million, up 49% from the prior year. This result was achieved despite hurricane-related production shut-ins from September through December 2005.

~~Commentary~~These on results were achieved with an average gas sales price of US$7.04 /Mcfe for ~~announcement~~the year, up from US$5.77/Mcfe for the 2004 year. Due to hurricane-related interruptions, all production in December quarter was effectively sold at hedged prices which averaged US$8.13/Mcfe rather than the higher spot prices which applied during this period.

~~General~~Production for the December quarter of 376 MMcfe was lower than the previous quarter (1,441 MMcfe) due to hurricane related shut-in of production.

~~The~~For ~~Appendix 4D results for announcement and~~ the ~~accompanying~~December ~~condensed~~quarter, ~~consolidated~~EBITDAX ~~interim financial~~from ~~statements~~normal ~~are~~operations ~~the~~was ~~first~~US$2.0 million, ~~Petsec~~and ~~Energy~~EBITDAX ~~Ltd~~was ~~reports~~a loss toof beUS$0.2 million ~~prepared~~after inexpensing ~~accordance~~ineffective ~~with Australian~~natural ~~equivalents~~gas tohedges ~~International~~of ~~Financial~~US$2.2 million ~~Reporting Standards~~ (~~“AIFRS”) and are presented~~i.e. inthe ~~United~~difference ~~States~~between ~~dollars~~hedged ~~[see~~and ~~notes~~produced 1volumes ~~and~~multiplied 11by of the ~~condensed~~difference ~~consolidated~~in ~~interim~~the ~~financial~~hedged ~~statements~~gas ~~for~~price ~~further~~and ~~explanation of~~ the ~~Company’s~~market ~~transition~~settlement toprice), ~~AIFRS].~~as ~~Comparatives~~is ~~for~~required ~~the half-year~~under ~~ended~~Australian 30equivalents ~~June 2004~~to International ~~have~~Financial ~~been~~Reporting ~~restated~~Standards ~~for~~ (“AIFRS”). ~~The transition to AIFRS had no impact on~~ ~~cash flows.~~

	Six months			Six months			Increase/
	ended			ended			(decrease)
Table	Jun 2005			Jun 2004			%
Net Production (MMcfe)		4,637			2,153			115.4
Unit revenue/cost analysis per Mcfe (US$)
Average net sales price/Mcfe (US$)		6.82			5.51			23.8
Other revenue/Mcfe (US$)		0.05			0.06
Lease operating expense (incl. prod’n taxes)/Mcfe (US$)		(0.25	)		(0.39	)		35.9
G,G&A expenses/Mcfe (US$)		(0.62	)		(1.09	)		43.1
EBITDAX/Mcfe (US$)		6.00			4.09			46.7
D,D&A/Mcfe (US$)		(2.64	)		(3.02	)

~~Production/Prices~~Cash at the end of the quarter was the equivalent of US$10.1 million (A$13.8 million), up from US$9.0 million (A$11.9 million).

~~Production for the current period of 4.6 Bcfe was 115.4% higher than the previous corresponding~~Hedging ~~period of 2.2 Bcfe, primarily due to the significant contribution to production from the Vermilion 258 field in the Gulf of Mexico, USA, which was brought into production in late July 2004.~~

~~Gas~~Due ~~Prices~~to hurricane-related shut-ins, hedged volumes exceeded produced volumes for the quarter by 668,000 MMbtu. The cost of these ineffective hedges for the quarter of US$2.2 million has been expensed during the period.

~~Gas~~A ~~prices~~combination ~~received, averaged US$6.82/Mcfe, representing an increase~~ of ~~23.8%~~gas onproduction in the ~~previous corresponding~~Gulf ~~period~~returning ~~price~~to ofnormal ~~US$5.51/Mcfe.~~levels ~~The~~as ~~current~~hurricane ~~Henry~~damage ~~Hub spot price~~ is ~~approximately~~ ~~[US$9.56/Mcf]~~repaired and ~~the~~warmer ~~NYMEX~~than ~~12 month~~normal ~~forward~~US ~~strip~~winter ~~price~~temperatures ishas ~~trading~~reduced atgas ~~approximately~~prices [to levels of US$9~~.58~~ to $10/Mcf].

~~Revenues~~Hedging currently in place for the 2006 year is 10,000 MMbtu/day for the first quarter and 6,000 MMBtu/day for the remainder of the year at an average price of US$8.20/MMBtu.

~~US dollar revenues net of royalties of US$ 31.6 million for the period were 165.5% higher than for~~OPERATIONS ~~the previous corresponding period (US$11.9 million), reflecting closely the increase in production.~~

~~Royalties paid~~USA

The increase in production and revenues is not reflected in royalties paid expense due to a change in late 2004 in the way the Minerals Management Services (“MMS”) earns its share of production revenue from wholly owned operating leases in the Gulf of Mexico~~. Previously~~, ~~the~~Offshore ~~MMS obtained its~~Louisiana royalty share from gross revenue proceeds whereas now it is entitled to its share of production (16.7%) prior to the oil and natural gas entering the sales line. For Petsec, this currently involves the Vermilion 258 lease only and the impact on the financials is that the Company’s net share of production is recorded directly as revenue and no associated royalty expense is recognised.

~~Expenses~~Hurricanes ~~from~~Katrina ~~ordinary~~and ~~activities~~Rita

~~The~~Hurricanes ~~pre-tax~~Katrina ~~profit~~and ofRita ~~US$7.2 million~~caused ~~was~~widespread ~~achieved~~damage ~~after~~to ~~lease~~production ~~operating~~facilities ~~costs~~in ofthe ~~US$1.2 million~~Gulf of ~~(US$0.25/Mcfe),~~Mexico ~~geological,~~during ~~geophysical~~August and ~~administrative~~September 2005. ~~expenses~~Although ofPetsec’s ~~US$2.9 million~~offshore platforms suffered only ~~(US$0.62/Mcfe),~~minor ~~depreciation~~damage, ~~depletion~~extensive ~~and~~damage ~~amortisation~~to ~~(“D,~~third ~~D&A”)~~party ofdownstream ~~US$12.3 million~~sales pipelines meant that these ~~[(US$2.67/Mcfe)]~~facilities (and ~~dry~~thus ~~hole~~Petsec ~~costs~~Energy’s ~~and~~platforms) ~~impairment~~were ~~expense~~shut-in for most of ~~US$8~~the December quarter.~~4 million.~~

~~The~~Vermilion ~~dry~~244, ~~hole~~246, ~~costs~~257, ~~and~~258, ~~impairment~~259 Petsec: ~~expense~~100% ofworking ~~US$8~~interest (83.~~4 million~~33% ~~relate~~net torevenue ~~a provision made against the~~interest) ~~Company’s~~Operator: ~~share~~Petsec ~~of the total lease and exploration costs incurred to-date in respect of the Price~~Energy ~~Lake field.~~

4The Vermilion 244, 246, 257, 258 and 259 leases are located approximately 114 kilometres (70 miles) south of Vermilion Parish, offshore Louisiana, in approximately 130 feet of water. The leases are proximal to the Vermilion 245 and 265 fields which have produced approximately 680 Bcfe of gas.

~~Table~~Petsec drilled the Vermilion 258 G-1 and G-2 discovery wells in December 2003 and January 2004, establishing estimated recoverable gas of ~~Contents~~the order of 21 Bcfe. Development of the field began in January 2004 with a three-pile platform and pipeline being installed within six months and production commencing in July 2004.

~~Profit~~Two further wells, the G-3 and G-7 development wells were drilled in October 2004 from the Vermilion 258 platform.

~~Profit~~Net ~~before~~production ~~tax~~from ~~was~~Vermilion ~~US$7.2 million~~for ~~and~~the ~~after~~quarter ~~tax~~was ~~US$7.7 million.~~335 ~~This~~MMcfe ~~compares~~of ~~to US$0~~gas.5m ~~and US$0.2m,~~The ~~respectively,~~field was shut-in for much of the ~~previous~~quarter ~~corresponding~~as ~~period~~a consequence of Hurricanes Katrina and Rita.

~~The~~Prospects ~~current~~with ~~period profit after tax amount was derived after recognition of~~ a ~~net~~target ~~income~~potential ~~tax benefit~~ of ~~US$0.5m~~40 ~~comprising;~~Bcfe ~~(a) US$3.2 million tax benefit~~ in ~~respect~~the ofVermilion ~~previously~~257 ~~unrecognised U.S.~~and ~~tax~~258 ~~loss~~leases, ~~carryforwards~~have ~~brought to account as recovery is considered probable based on analysis~~been ~~performed~~identified atwith ~~the~~3D ~~half-year, offset by (b) current period income tax expense of US$2~~seismic.~~7 million~~ ~~[for further~~These ~~details~~prospects ofare ~~tax~~expected ~~treatment~~to ~~refer~~be todrilled ~~note~~in ~~11(c)]~~2006.

~~Dividend~~West Cameron 343 Petsec: 100% -75% working interest (82.33% — 61.75% net revenue interest)

~~Petsec~~West ~~does~~Cameron ~~not~~352 Petsec: ~~propose~~56.25% ~~the~~working ~~payment~~interest of(46.125% anet ~~dividend~~revenue ininterest) Operator: ~~respect~~Petsec ~~of the half-year ended 30 June 2005.~~Energy

~~Cash~~Net ~~flow~~production from West Cameron in December quarter was 41 MMcfe of gas. The field was shut-in for much of the quarter due to Hurricanes Katrina and Rita.

~~Net~~Main ~~operating~~Pass ~~cash~~19 Petsec: ~~flow~~55% ofworking ~~US$24.3 million~~interest ~~represents an increase of 155~~(45.883% onnet ~~2004~~revenue ~~reflecting~~interest) ~~strong~~Operator: ~~growth~~Petsec ~~in production and revenues.~~Energy

~~Capital Expenditures~~ 4

InThe ~~the~~Main ~~first~~Pass ~~half~~19 lease of ~~2005~~4,995 acres was acquired in June 2004 at a cost to Petsec of US$180.4 95 million. ~~was~~The ~~invested~~lease inis ~~exploration,~~approximately ~~evaluation~~128 ~~and~~kilometres ~~development~~(80 miles) south-east of New Orleans in ~~expenditure~~eight metres (27 feet) of water.

~~During~~A three-well drilling programme in April through to June 2005 discovered estimated recoverable gas of 13 Bcfe net to Petsec. The results met pre-drilling expectations and demonstrated further exploration potential in the ~~period,~~lease and the ~~Company:~~adjacent Main Pass 18 lease.

•Development ~~Completed a successful three well drilling programme on the Main Pass 19 lease~~ and ~~commenced~~commissioning ~~the refurbishment and construction~~ of ~~a platform, pipeline and production facilities. • Acquired~~ the Main Pass ~~18 and 103 leases at the March 2005 MMS lease sale. These leases are adjacent to Main Pass~~ 19. •gas ~~Commenced~~field 3Dwas ~~seismic~~successfully ~~survey~~completed ~~programme~~during the ~~over~~quarter, ~~240~~with ~~square~~gas ~~kilometres~~production ~~(94~~commencing ~~square~~on ~~miles)~~11th ~~in St James Parish, onshore Louisiana~~January 2006. •Initial ~~Successfully~~production ~~completed~~from ~~remedial work to overcome initial mechanical difficulties on~~ the three ~~Vermilion~~wells ~~258~~has ~~G-3~~met ~~well,~~expectations ~~the~~and ~~well~~is ~~now~~currently producing ~~approximately 5.5 MMcf per day. • Participated~~ in ~~feasibility~~excess ~~studies and the development~~ of ~~an Oil Development Plan for the~~ 10 ~~million~~MMcf/day ~~barrel~~net ~~12.8~~to Petsec ~~West oil field, which is nearing completion~~Energy.

~~Cash~~A onfour-well ~~Hand~~drilling programme commenced in December 2005 to test 3D seismic mapped potential of 15-18 Bcfe of gas net to Petsec Energy. The first two wells, the G-7 and G-4, are commercial gas discoveries, meeting pre-drill expectations. The last well in the programme will test targets in the Main Pass 18 lease.

~~Cash~~Main onPass ~~hand~~18 at& ~~the~~103 Petsec: ~~end~~100% ofworking ~~the~~interest ~~period~~(83.33% ~~was~~net ~~US$15.6 million.~~revenue interest) Operator: Petsec Energy

5Petsec acquired the Main Pass 18 and 103 leases at the March 2005 MMS lease sale. These two leases are adjacent to Main Pass 19. All three were part of a large oil and gas field discovered by Mobil in the late 1960’s.

~~Table~~The last well of ~~Contents~~the above four-well programme (the G-6), will test targets in Main Pass 18.

~~Estimated~~USA ~~Reserves~~Onshore ~~(Net revenue interest)~~Louisiana

	Petsec
	Estimated Recoverable
	Bcfe
USA
Reserves at 1 January 2005		21.9
Net additions in first half 2005		13.1
Revisions		(3.9	)
Production in first half 2005		(4.6	)
USA Reserves at 30 June 2005		26.5
China *
Beibu Gulf 12-8 West, Reserves at 30 June 2005		7.5
Total Reserves at 30 June 2005		34.0

Moonshine Project
Petsec: 50% working interest (36% — 37.5% net revenue interest)
Operator: Petsec Energy

*		China – Petsec Estimates for a 12.5% net revenue interest after CNOOC back-in.
		12.8 West oil field – 1.25 million bbls recoverable i.e. equivalent to 7.5 Bcfe.
		12.8 East / 6.12.1 oil field – potentially recoverable 1.5 — 3.125 million bbl, subject to further feasibility studies and not included in reserves total.

Petsec entered into a joint venture agreement in December 2004 to acquire exploration rights, including participation in a 3D seismic survey programme, over 240 square kilometres (94 square miles) in St James Parish, onshore Louisiana. This is an area equivalent in size to approximately 12 offshore Gulf of Mexico leases. The project area abuts the south bank of the Mississippi River at College Point approximately 80 kilometres (50 miles) west of New Orleans.

6The area has not previously been subject to 3D seismic testing and is highly prospective for both shallow and deep reserves. The survey area is proximal to six fields which have produced approximately 340 Bcf of gas and 7.3 million barrels of oil from numerous sand horizons.

~~Table~~Petsec Energy’s partners in the Moonshine Project are US companies: Dominion Exploration and Production (a subsidiary of ~~Contents~~Dominion Resources Inc), Cox and Perkins Exploration Inc., The Gray Exploration Company and GLS LLC.

~~Directors~~The ~~Report~~field ~~and~~acquisition ~~Condensed~~of ~~Consolidated~~240 ~~Interim~~square ~~Financial~~kilometres ~~Statements~~of 3D seismic data was completed during the ~~For~~September quarter and processed data was delivered in the ~~period~~December ~~ended~~quarter. 30Data ~~June 2005~~quality is good and interpretation has commenced. Drilling of prospects generated from interpretation of the 3D seismic data is expected to commence in the second half of 2006.

Contents	Page
Directors’ report		5
Condensed consolidated interim financial statements		7

CHINA

~~This~~Beibu ~~interim~~Gulf ~~financial~~Block ~~report~~22/12 Petsec: ~~does~~25% ~~not~~working ~~include~~interest ~~all the notes of the type normally included in an annual financial report~~(12.5 ~~Accordingly,~~% ~~this~~net ~~report~~revenue isinterest toshould beChina ~~read~~National inOffshore ~~conjunction with the annual~~Oil ~~report~~Corporation ~~for the year ended 31 December~~(CNOOC) ~~2004 and any public announcements made by Petsec Energy Ltd during the interim reporting period~~ back-in ~~accordance~~for ~~with the continuous disclosure requirements of~~51%) ~~the~~Operator: ~~Corporations~~Roc ~~Act~~Oil ~~2001.~~Limited

~~PETSEC~~Beibu ~~ENERGY~~Gulf ~~LTD~~Block 22/12 is located approximately 60 kilometres off the southern coast of China, north-west of Hainan Island in shallow water, 25 to 40 metres deep. Four oil discoveries (12.2.1, 12.3.1, 12.8.1, and 12.8.2) were made on the lease in the early 1980’s and 1990’s. These discoveries contain an estimated 45.6 million barrels of recoverable oil, (per independent consultants July 2003). The substantial Wei 12.1, 11.4 and 10.3/3N oilfields and two recent large

7 5

~~Table~~discoveries of ~~Contents~~the 11.1 and 11.1 North fields, operated by CNOOC, are located nearby to the north and west with production via a pipeline to the Weizhou Island oil processing facilities, 10 kilometres to the north of 22/12. These CNOOC fields each contain an estimated 40 to 100 million barrels of recoverable oil.

~~DIRECTORS~~Petsec ~~REPORT~~earned a 25% interest in the contract area in March 2002 by participating in the drilling of the Wei 6.12.1 well which discovered nine metres of net oil pay, estimated to contain 2.6 to 10 million barrels of recoverable oil.

~~Your~~A ~~directors~~3D ~~submit~~seismic ~~their~~survey ~~report~~was ~~for~~acquired over the ~~six~~450 ~~months~~square ~~ended~~kilometre 30(175 ~~June 2005~~square miles) block in late 2002. Interpretation of the survey in 2003 clearly defined the existing oil discoveries as well as a significant number of drill prospects.

~~DIRECTORS~~Three wells were drilled during 2004 one of which, the Wei 12.8.3 well drilled in the second quarter, resulted in a successful appraisal of the Wei 12.8 East oil field. In September 2004 the joint venture elected to enter the third exploration phase of the petroleum contract and commit to a feasibility study for development of the Wei 12.8 East and West fields, estimated to contain some 20 to 25 million barrels of recoverable oil.

~~The~~Successful ~~names~~pre-feasibility ofstudies, conducted jointly by CNOOC and the ~~company’s~~joint ~~directors~~venture, were completed in ~~office~~January 2005. ~~during~~Consequently the ~~half-year~~joint ~~and~~venture ~~until~~agreed to undertake a feasibility study, again jointly with CNOOC. If successful, this will lead to the ~~date~~lodging of ~~this~~an Overall ~~report~~Development ~~are~~Programme as(ODP) which ~~below~~contemplates the development of the 12.8 ~~These~~West ~~directors~~field (approximately ~~were~~10 million barrels of recoverable oil, 1.25 million barrels net to Petsec) in 2006 ~~office~~with ~~for~~anticipated ~~this~~start ~~entire~~of ~~period~~production ~~unless~~in ~~otherwise~~2007. ~~stated~~This may be followed by the development of the East field (approximately 10 to 15 million barrels of recoverable oil) possibly in 2007.

~~Terrence~~The N.feasibility ~~Fern~~study ~~(Chairman~~is ~~and~~addressing ~~Managing~~the ~~Director) David~~use Aof a lightweight platform at 12.8 ~~Mortimer~~West, piping ~~Peter~~liquids Eto the 12.1.1 ~~Power~~platform for processing and piping the oil through CNOOC’s existing pipeline to Weizhou Island for sale.

~~OPERATING~~The ~~RESULTS~~feasibility study was completed in the quarter and commercial discussions for economic access to CNOOC’s production and sales facilities continue.

The ~~company~~joint ~~experienced~~venture ~~significant~~expects ~~increases~~to indrill ~~both~~the ~~revenue~~6.12 ~~and~~South ~~profits~~prospect ~~during~~in ~~the half-year~~March 2006. ~~Net~~The ~~oil~~prospect ~~and~~has ~~gas~~3D seismic ~~revenue~~mapped ~~after~~potential ~~royalties~~of ~~for~~10 ~~the~~to ~~half-year was US$31.6~~20 million barrels of oil recoverable (~~2004: US$11~~1.925 to 2.5 million) bbls ~~representing~~net anto ~~increase~~Petsec ofEnergy) ~~167%,~~and ~~driven~~is bylocated ~~production~~immediately ~~from~~south of the ~~company’s~~6.12.1 ~~newly developed~~oil ~~Vermilion~~discovery ~~258~~made ~~gas~~by the ~~field~~joint ~~and~~venture ~~higher~~in ~~gas prices~~2002.

~~Consolidated~~MARCH ~~net~~2006 ~~profit after income tax for the half-year was US$7.7 million compared to US$0.2~~QUARTER: ~~million in the prior corresponding period, reflecting the above mentioned growth in production and~~EXPLORATION higher gas prices. This increase in profit was recorded after the write-off of US$8.4 million in costs associated with drilling at Price Lake in Louisiana and a net income tax benefit of US$0.5 million comprising; (a) US$3.2 million tax benefit in respect of previously unrecognised U.S. tax loss carryforwards brought to account as recovery is considered probable based on analysis performed at the half-year, offset by (b) current period income tax expense of US$2.7 million.

~~The gas price continued to increase over the period with an average price received for the~~USA ~~half-year of US$6.82/Mcfe up 24 % from the average of US$5.51/Mcfe achieved for the prior corresponding half-year.~~

~~REVIEW~~Main OFPass ~~OPERATIONS~~19 and 18

~~During~~A ~~the~~four-well ~~period,~~drilling ~~the~~programme ~~company~~to ~~continued~~test ~~its~~a ~~oil~~total ~~and~~of 15-18 Bcfe of gas ~~exploration~~(net ~~and~~to ~~production~~Petsec ~~activities~~Energy) incommenced ~~the~~during ~~Gulf~~December. ofCommercial ~~Mexico~~gas ~~region~~discoveries ofwere made in the ~~USA~~first two wells, the G-4 and G-7, reported in ~~Beibu~~January 2006. ~~Gulf~~The ~~off~~G-5 well is drilling ahead, and the ~~southern~~G-6, ~~coast~~which ofwill be ~~China~~drilled into Main Pass 18, is expected to spud in late February.

~~Gulf~~Moonshine ~~of Mexico – USA~~Project

~~Production~~Interpretation of the newly acquired 3D seismic data continues. Drilling is expected to begin in the second half of 2006.

~~Total production for the half-year was 4.6 Bcfe up 115% from 2.2 Bcfe in the prior corresponding~~CHINA half-year. This increase resulted from the commencement of production from the Vermilion 258 gas field in July 2004 which supplemented production from the company’s existing West Cameron 343/352 gas field.

~~PETSEC~~Block ~~ENERGY LTD~~22/12

8The joint venture expects to drill an exploration well on the 6.12 South prospect in March 2006. The prospect size is of the order of 10 to 20 million barrels of recoverable oil (1.25 to 2.5 million barrels net to Petsec Energy) and is located immediately south of the 6.12.1 oil discovery made by the joint venture in 2002.

~~Table of Contents~~ 6

~~Directors’ Report (continued)~~DEVELOPMENT

~~Exploration~~USA — Main Pass 19

~~During~~The ~~the~~Main ~~half-year,~~Pass ~~three~~19 ~~wells~~platform ~~were~~was ~~drilled~~set onin ~~Main~~December ~~Pass~~and 19gas inproduction ~~the~~commenced ~~Gulf~~on of11 ~~Mexico,~~January 2006. A ~~offshore~~four-well ~~USA and~~programme ~~two~~is ~~wells~~currently ~~were~~being drilled atfrom ~~Price~~the ~~Lake,~~Main ~~Louisiana~~Pass 19 platform.

~~The~~CHINA ~~three~~— ~~Main~~Block ~~Pass 19 wells were all successful, discovering an estimated 13 billion cubic feet~~22/12 equivalent (Bcfe) of recoverable gas net to Petsec Energy. The wells have been completed and production is expected to commence in the last quarter of 2005 when the production platform and pipeline have been commissioned.

~~The~~Discussions ~~two~~continue ~~wells~~with atrelevant ~~Price~~government ~~Lake~~authorities ~~intersected minor gas~~ in ~~the~~China ~~shallow~~on ~~section~~commercial aspects of ~~each well but failed to~~the ~~discover~~development of the ~~primary objective deep potential~~12.8 ~~The~~West ~~wells~~oil ~~were completed for production~~field. ~~Mechanical~~ ~~difficulties caused significant cost overruns.~~

~~Petsec~~Dated: ~~and~~31 ~~the operator have now withdrawn from this project in consideration of a release from a~~January 2006 ~~commitment to drill a third well. All costs associated with this project have been expensed.~~

At Moonshine, onshore Louisiana, a 3-D seismic survey programme over 240 square kilometres (94 square miles) is nearing completion and processed data is expected to be available in the last quarter of this year.


For further information, please contact:
Mr. Craig Jones		Mr. Ross A. Keogh
General Manager- Corporate		President
Petsec Energy Ltd		Petsec Energy Inc.
Level 13 , 1 Alfred Street		3861 Ambassador Caffery Parkway , Suite 500
Sydney NSW 2000		Lafayette, LA 70503, USA
Tel: 612 9247 4605 Fax 612 9251 2410		Tel: 1 (337) 989 1942 Fax: 1 (337) 989 7271

~~Lease~~Certain ~~Acquisitions~~statements in this report regarding future expectations and plans of the Company may be regarded as “forward-looking statements”. Although the Company believes that its expectations and plans are based upon reasonable assumptions, it can give no assurance that its goals will be met. Actual results may vary significantly from those anticipated due to many factors, including oil and gas prices, operating hazards, drilling risks, environmental risks and uncertainties in interpreting engineering and other data relating to oil and gas reservoirs, as well as other risks.

~~During the period the company acquired two new leases, Main Pass 18 and 103 in the Gulf of Mexico at a total cost of US$2.1~~ ~~million. These leases are adjacent to Main Pass 19 on which a net 13 Bcfe~~7 ~~was discovered by the Company in the half-year.~~

~~China, Beibu Gulf~~ 8

~~Petsec~~TABLE ~~has~~OF a 25% joint venture interest in Block 22/12, a 450 square kilometre (175 square mile) area located approximately 60 kilometres off the southern coast of China. Activities over this period have focussed on a feasibility study which is being conducted by the joint venture and by China National Offshore Oil Company (CNOOC), which is now nearing completion. If successful, this will lead to the lodging of an oil development plan (ODP) during the third quarter which contemplates the development of the 12.8 West field (approximately 10 MMbls of recoverable oil, 1.25 MMbls net to Petsec) in 2006 with anticipated start of production in early 2007. CONTENTS

~~ROUNDING~~ SIGNATURES

~~The amounts contained in the half-year financial report have been rounded to the nearest $1,000~~SIGNATURES ~~(where applicable) under the option available to the company under ASIC Class Order 98/0100. The company is an entity to which the Class Order applies.~~

A Pursuant ~~copy~~to of the ~~auditors’~~requirements ~~independence~~of ~~declaration~~the asSecurities ~~required~~Exchange ~~under~~Act ~~Section 307C~~ of 1934, the ~~Corporations Act~~registrant ishas ~~included~~duly caused ~~with~~this ~~the~~report ~~directors’~~to ~~report~~be signed on ~~page~~its 42behalf by the undersigned, thereunto duly authorized.

Signed in accordance with a resolution of the directors.


	Petsec Energy Ltd
Date: February 9, 2006	By:	Mr. Craig H. Jones

		/s/ Craig H. Jones
		Craig H. Jones General Manager - Corporate

~~D.A. Mortimer Director Dated 23 August~~ ~~2005~~9

PETSEC ENERGY LTD

Condensed consolidated interim income statement For the six months ended 30 June 2005

			Six months to
				30 June		30 June
				2005		2004
	Notes			US$’000		US$’000
Revenues from sale of oil & gas and royalties				32,696		14,584
Royalties paid				(1,080	)	(2,728	)
Net revenues after royalties				31,616		11,856
Other income				225		161
Total revenues				31,841		12,017
Lease operating expenses				(1,150	)	(844	)
Geological, geophysical and administrative expenses				(2,867	)	(2,354	)
EBITDAX (1)				27,824		8,819
Depreciation, depletion and amortisation				(12,255	)	(6,498	)
Exploration expenditure				—		(160	)
Dry hole and impairment expense		2		(8,421	)	(1,270	)
Major maintenance expense		2		—		(568	)
EBIT (2)				7,148		323
Financial income				145		215
Financial expenses				(66	)	(17	)
Net financial income				79		198
Profit before tax				7,227		521
Income tax benefit/(expense)				457		(358	)
Profit for the period				7,684		163
				US		US
				Cents		Cents
Basic earnings per share		3		6.4		0.1
Diluted earnings per share		3		6.3		0.1

(1)		Earnings before interest, tax, depreciation, depletion, amortisation and exploration (including dry hole and impairment expense and major maintenance expense).
(2)		Earning before interest and tax.

PETSEC ENERGY LTD

Condensed consolidated interim balance sheet As at 30 June 2005

			30 Jun 2005			31 Dec 2004
	Notes		US$’000			US$’000
ASSETS
Current assets
Cash and cash equivalents				15,570			9,517
Trade and other receivables				8,972			6,959
Prepayments				1,504			2,016
Total current assets				26,046			18,492
Non-current assets
Other investments				496			543
Property, plant and equipment				134			166
Exploration, evaluation and development expenditure — Tangible				30,535			32,645
Exploration and evaluation expenditure — Intangible				9,927			5,407
Intangible assets				66			79
Deferred tax assets				14,265			12,964
Other financial assets				22			35
Total non-current assets				55,445			51,839
Total assets				81,491			70,331
LIABILITIES
Current liabilities
Trade and other payables				13,680			10,337
Interest-bearing loans and borrowings				297			1,175
Employee benefits				25			37
Fair value of derivative financial instruments				1,066			—
Total current liabilities				15,068			11,549
Non-current liabilities
Employee benefits				248			267
Rehabilitation provision				974			811
Deferred tax liabilities				5,496			5,239
Fair value of derivative financial instruments				143			—
Total non-current liabilities				6,861			6,317
Total liabilities				21,929			17,866
Net assets				59,562			52,465
EQUITY
Issued capital		4		116,354			116,193
Reserves				7,090			7,838
Accumulated losses				(63,882	)		(71,566	)
Total equity				59,562			52,465

PETSEC ENERGY LTD

Condensed consolidated interim statement of changes in equity For the six months ended 30 June 2005

	Six months to
		30 June		30 June
		2005		2004
		US$’000		US$’000
Total equity at the beginning of the period		52,465		24,887
Available-for-sale financial assets, net of tax		(21	)	—
Cash flow hedges, net of tax		(752	)	—
Exchange differences on translation of Australian operations		(22	)	(901	)
Net loss recognised directly in equity		(795	)	(901	)
Profit for the period		7,684		163
Total recognised income and expense for the period		6,889		(738	)
Share-based compensation		47		49
Transactions with equity holders in their capacity as equity holders:
Contributions of equity, net of transaction costs		161		9,082
Total equity at the end of the period		59,562		33,280
Total recognised income and expense for the period is attributable to:
Members of Petsec Energy Ltd		6,889		(738	)

PETSEC ENERGY LTD

Condensed consolidated interim statement of cash flows For the six months ended 30 June 2005

	Six months to
		30 June		30 June
		2005		2004
		US$’000		US$’000
Cash flows from operating activities
Cash receipts from customers		33,001		15,530
Cash payments to suppliers and employers		(8,814	)	(6,209	)
Interest received		146		215
Dividend received		62		—
Interest paid		(23	)	(5	)
Income taxes paid		(100	)	—
Net cash from operating activities		24,272		9,531
Cash flows from investing activities
Payments for property, plant and equipment		(12	)	(227	)
Payments for exploration, evaluation and development expenditure		(18,418	)	(14,179	)
Payments for investments		—		(128	)
Distributions from investments		93		—
Net cash (outflow) from investing activities		(18,337	)	(14,534	)
Cash flows from financing activities
Proceeds from issue of share capital		161		1,829
Net cash from financing activities		161		1,829
Net increase/(decrease) in cash and cash equivalents		6,096		(3,174	)
Cash and cash equivalents at 1 January		9,517		12,462
Effects of exchange rate changes on cash held		(43	)	(548	)
Cash and cash equivalents at 30 June		15,570		8,740

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements For the six months ended 30 June 2005

1. Significant accounting policies

Petsec Energy Ltd (the “Company”) is a company domiciled in Australia. The condensed consolidated interim financial report of the Company for the six months ended 30 June 2005, comprise the Company and its subsidiaries (together referred to as the “consolidated entity”).

The condensed consolidated interim financial report was authorised for issue by the directors on 23 August 2005.

(a) Statement of compliance

The condensed consolidated interim financial report is a general purpose financial report which has been prepared in accordance with Australian Accounting Standards, Urgent Issues Group Interpretations adopted by the Australian Accounting Standards Board (“AASB”) and the Corporations Act 2001. International Financial Reporting Standards (“IFRSs”) form the basis of Australian Accounting Standards adopted by the AASB, being Australian equivalents to IFRS (“AIFRS”). The interim financial report of the consolidated entity also complies with IFRS and interpretations adopted by the International Accounting Standards Board.

This interim financial report does not include all the notes of the type normally included in an annual financial report. Accordingly, this report is to be read in conjunction with the annual report for the year ended 31 December 2004 and any public announcements made by Petsec Energy Ltd and its controlled entities during the interim reporting period in accordance with the continuous disclosure requirements of the Corporations Act 2001.

This interim financial report is the first Petsec Energy Ltd condensed consolidated interim financial report to be prepared in accordance with AIFRS. AASB 1 First-time adoption of Australian Equivalent to International Financial Reporting Standards has been applied in preparing these financial statements.

Financial statements of Petsec Energy Ltd until 31 December 2004 had been prepared in accordance with previous Australian Generally Accepted Accounting Principles (AGAAP). AGAAP differs in certain respects from AIFRS. When preparing the Petsec Energy Ltd interim financial report for the six months ended 30 June 2005, management has amended certain accounting, valuation and consolidation methods applied in the previous AGAAP financial statements to comply with AIFRS (refer note 11 for further information).

This condensed consolidated interim financial report has been prepared on the basis of AIFRSs in issue that are effective or available for early adoption at the consolidated entity’s first AIFRS annual reporting date, 31 December 2005. Based on these AIFRSs, the Board of Directors have made assumptions about the accounting policies expected to be adopted (accounting policies) when the first AIFRS annual financial report is prepared for the year ending 31 December 2005. The consolidated entity has elected to early adopt the following standards:

• AASB 119 Employee Benefits (Dec 2004); • Amendments to AASB 1 First-time Adoption of Australian Equivalents to International Financial Reporting Standards (July 2004), AASB 101 Presentation of Financial Statements and AASB 124 Related Party Disclosures made in AASB 2004-3 Amendments to Australian Accounting Standards; • Amendments to AASB 139 Financial Instruments: Recognition and Measurement made in AASB 2005-1 Amendments to Australian Accounting Standard; • Amendments to AASB 119 Employee Benefits (Dec 2004) made in AASB 2005-3 Amendments to Australian Accounting Standards;

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued)

For the six months ended 30 June 2005

1. Significant accounting policies (continued)

(a) Statement of compliance (continued)

• Amendments to AASB 139 Financial Instruments: Recognition and Measurement, AASB 132 Financial Instruments: Disclosure and Presentation, and AASB 1 First-time Adoption of Australian Equivalents to International Financial Reporting Standards made in AASB 2005-4 Amendments to Australian Accounting Standards; • Amendments to AASB 1 First-time Adoption of Australian Equivalents to International Financial Reporting Standards and AASB 139 Instruments: Recognition and Measurement made in AASB 2005-5 Amendments to Australian Accounting Standards; • Amendments to AASB 3 Business Combinations made in AASB 2005-6 Amendments to Australian Accounting Standards.

With the exception of financial instruments, the comparative figures were restated to reflect these adjustments. The consolidated entity has taken the exemption available under AASB 1 to only apply AASB 132 Financial Instruments: Disclosure and Presentation and AASB 139 Financial Instruments: Recognition and Measurement from 1 January 2005.

The Australian Accounting Standards and UIG Interpretations that will be effective or available for voluntary early adoption in the annual financial statements for the period ended 31 December 2005 are still subject to change therefore cannot be determined with certainty. Accordingly, the accounting policies for that annual period that are relevant to this interim financial information will be determined only when the first AIFRS financial statements are prepared at 31 December 2005.

The preparation of the condensed consolidated interim financial report in accordance with AASB 134 resulted in changes to the accounting policies as compared with the most recent annual financial statements prepared under previous GAAP. Unless otherwise indicated, the accounting policies set out below have been applied consistently to all periods presented in these condensed consolidated interim financial statements. They also have been applied in preparing an opening AIFRS balance sheet at 1 January 2004 for the purposes of the transition to AIFRSs, as required by AASB 1. The impact of the transition from previous GAAP to AIFRSs is explained in note 11.

(b) Basis of preparation

The financial report is presented in United States dollars which is the consolidated entity’s choice of presentation currency.

The financial report is prepared on the historical cost basis except that the following assets and liabilities are stated at their fair value: derivative financial instruments and financial assets classified as available-for-sale.

The Company is of a kind referred to in ASIC Class Order 98/100 dated 10 July 1998 and in accordance with that Class Order, amounts in the financial report have been rounded off to the nearest thousand dollars, unless otherwise stated.

The preparation of an interim financial report in conformity with AASB 134 Interim Financial Reporting requires management to make judgements, estimates and assumptions that affect the application of policies and reported amounts of assets and liabilities, income and expenses. These estimates and associated assumptions are based on historical experience and various other factors that are believed to be reasonable under the circumstances, the results of which form the basis of making the judgements about carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates. These accounting policies have been consistently applied by each entity in the consolidated entity.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

1. Significant accounting policies (continued)

(b) Basis of preparation (continued)

The estimates and underlying assumptions are reviewed on an ongoing basis. Revisions to accounting estimates are recognised in the period in which the estimate is revised if the revision affects only that period, or in the period of the revision and future periods if the revision affects both current and future periods.

Except for the change in accounting policy (refer note 12), the accounting policies set out below have been applied consistently to all periods presented in the consolidated financial report and in preparing an opening AIFRS balance sheet at 1 January 2004 for the purposes of the transition to Australian Accounting Standards – AIFRS. Where relevant, the accounting policy applied to the comparative period presented has also been disclosed.

The accounting policies have been consistently applied by each entity in the consolidated entity.

(i) Subsidiaries

Subsidiaries are entities controlled by the Company. Control exists when the Company has the power, directly or indirectly, to govern the financial and operating policies of an entity so as to obtain benefits from its activities. In assessing control, potential voting rights that presently are exercisable or convertible are taken into account. The financial statements of subsidiaries are included in the condensed consolidated interim financial report from the date that control commences until the date that control ceases.

(ii) Joint ventures

Joint ventures are those entities over whose activities the consolidated entity has joint control, established by contractual agreement.

Jointly controlled operations and assets

The interest of the consolidated entity in unincorporated joint ventures and jointly controlled assets are brought to account by recognising in its financial statements the assets it controls and the liabilities that it incurs, and the expenses it incurs and its share of income that it earns from the sale of goods or services by the joint venture.

(iii) Transactions eliminated on consolidation

Intra-group balances and any unrealised gains and losses or income and expenses arising from intra-group transactions, are eliminated in preparing the condensed consolidated interim financial statements.

Unrealised losses are eliminated in the same way as unrealised gains, but only to the extent that there is no evidence of impairment.

(d) Foreign currency

(i) Functional and presentation currency

Items included in the financial statements of each of the consolidated entity’s subsidiaries are measured using the currency of the primary economic environment in which the subsidiary operates (“the functional currency”). The functional currency of the Company and its Australian subsidiaries is Australian dollars (A$) and the functional currency of the Company’s overseas subsidiaries is United States dollars (US$).

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

1. Significant accounting policies (continued)

(d) Foreign currency (continued)

The consolidated financial statements are presented in United States dollars. The consolidated entity believes the US dollar is the best measure of performance for Petsec Energy Ltd because oil and gas, the consolidated entity’s dominant sources of revenue, are priced in US dollars and the consolidated entity’s main operations are based in the USA and China with most of the costs incurred in US dollars.

The results and financial position of the consolidated entity are translated into the presentation currency as follows:

§ assets and liabilities for each balance sheet presented are translated at the closing rate at the date of that balance sheet; § income and expenses for each income statement are translated at average exchange rates (unless this is not a reasonable approximation of the cumulative effect of the rates prevailing on the transaction dates, in which case income and expenses are translated at the dates of the transactions); and § all resulting exchange differences are recognised as a separate component of equity.

(ii) Transactions and balances

Foreign currency transactions are translated at the exchange rates prevailing at the date of the transaction. Monetary assets and liabilities denominated in foreign currencies at the balance sheet date are translated to the respective functional currency at the foreign exchange rate ruling at that date. Foreign exchange gains and losses resulting from the settlement of such transactions and from the translation at year-end exchange rates of monetary assets and liabilities denominated in foreign currencies are recognised in the income statement, except when deferred in equity as qualifying cash flow hedges and qualifying net investment hedges.

Non-monetary assets and liabilities that are measured in terms of historical cost in a foreign currency are translated using the exchange rate at the date of the transaction. Translation differences on non-monetary items, such as equities held at fair value through profit or loss, are reported as part of the fair value gain or loss. Translation differences on non-monetary items, such as equities classified as available-for-sale financial assets, are included in the fair value reserve in equity.

The assets and liabilities of foreign operations, including goodwill and fair value adjustments arising on consolidation, generally are translated to the respective functional currency at foreign exchange rates ruling at the balance sheet date.

(iii) Group companies

On consolidation, exchange differences arising from the translation of any net investment in foreign entities, and of borrowings and other currency instruments designated as hedges of such investments, are taken to a reserve within equity. When a foreign operation is sold, a proportionate share of such exchange differences are recognised in the income statement as part of the gain or loss on sale.

The assets and liabilities of Australian dollar functional currency entities are translated to US dollars at foreign exchange rates ruling at reporting date. The revenues and expenses of Australian dollar functional currency entities are translated at rates approximating to the foreign exchange rates ruling at the dates of the transactions. Exchange differences arising on translation are recognised within a separate component of equity until disposal or partial disposal of the foreign operation.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

1. Significant accounting policies (continued)

(e) Derivative financial instruments and hedging activities

Current period policy

The consolidated entity is exposed to changes in interest rates, foreign exchange rates and commodity prices from its operations. From time to time, the consolidated entity enters into derivative financial instruments to manage a portion of its oil and gas price risks. Derivative financial instruments are not held for speculative purposes.

Derivative financial instruments are initially recognised at cost on the date a derivative contract is entered into and are subsequently remeasured to their fair value. The method of recognising the resulting gain or loss depends on whether the derivative is designated as a hedging instrument, and if so, the nature of the item being hedged. The consolidated entity designates certain derivatives as either; (1) hedges of the fair value if recognised assets or liabilities or a firm commitment (fair value hedge); or (2) hedges of highly probable forecast transactions (cash flow hedges).

The consolidated entity documents at the inception of the transaction the relationship between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking various hedge transactions. The consolidated entity also documents its assessment, both at hedge inception and on an ongoing basis, of whether the derivatives that are used in hedging transactions have been and will continue to be highly effective in offsetting changes in fair values or cash flows of hedged items.

(i) Fair value

Changes in the fair value of derivative financial instruments that are designated and qualify as fair value hedges are recorded in the income statement, together with any changes in the fair value of the hedged asset or liability that are attributable to the hedged risk.

(ii) Cash flow hedge

The effective portion of changes in the fair value of derivative financial instruments that are designated and qualify as cash flow hedges is recognised in equity in the hedging reserve. The gain or loss relating to the ineffective portion is recognised immediately in the income statement.

Amounts accumulated in equity are recycled in the income statement in the periods when the hedged item will affect profit or loss (for instance when the forecast sale that is hedged takes place). However, when the forecast transaction that is hedged results in the recognition of a non-financial asset or a non-financial liability, the gains and losses previously deferred in equity are transferred from equity and included in the measurement of the initial cost or carrying amount of the non-financial asset or liability.

When a hedging instrument expires or is sold, terminated or exercised, or when a hedge no longer meets the criteria for hedge accounting, any cumulative gain or loss existing in equity at that time remains in equity and is recognised when the forecast transaction is ultimately recognised in the income statement. When a forecast transaction is no longer expected to occur, the cumulative unrealised gain or loss that was reported in equity is immediately recognised in the income statement.

(iii) Derivative financial instruments that do not qualify for hedge accounting

Certain derivative financial instruments do not qualify for hedge accounting. Changes in the fair value of any derivative financial instrument that does not qualify for hedge accounting are recognised immediately in the income statement.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

1. Significant accounting policies (continued)

(e) Derivative financial instruments and hedging activities (continued)

Comparative period policy

The consolidated entity is exposed to changes in interest rates, foreign exchange rates and commodity prices from its operations.

The consolidated entity enters into derivative financial instruments to manage a portion of its oil and gas price risks. All gains or losses on hedge transactions are brought to account in the statement of financial performance in the same period that the underlying production occurs. Derivative instruments are not held for speculative purposes.

The quantitative effect of the change in accounting policy is set out in note 12.

(f) Exploration, evaluation and development expenditure – Tangible

Exploration, evaluation and development costs are accumulated in respect of each separate area of interest.

Exploration and evaluation assets relating to an area of interest are measured at cost at recognition, but are carried forward only to the extent that they are expected to be recouped through successful development and exploitation, or sale of the area, or where exploration and evaluation activities have not yet reached a stage which permits a reasonable assessment of the existence of economically recoverable reserves and active and significant exploration operations are continuing. Exploration and evaluation assets are assessed for impairment when facts and circumstances suggest that the carrying amount of an exploration and evaluation asset may exceed its recoverable amount. In the event that indicators of impairment are present, an impairment loss is recorded based on the higher of an asset’s fair value less costs to sell and value in use [see note 1(h)].

Development costs related to an area of interest are carried forward to the extent that they are expected to be recouped either through the sale or successful exploitation of the area of interest.

When an area of interest is abandoned or the directors decide that it is not commercial, any accumulated costs in respect of that area are written off in the financial period the decision is made.

(g) Property, plant and equipment

(i) Owned assets

Items of property, plant and equipment are stated at cost less accumulated depreciation (see below) and any impairment losses [see note 1(h)]. The cost of self-constructed assets and acquired assets includes the cost of materials, direct labour and the initial estimate, where relevant, of the costs of dismantling and removing the items and restoring the site on which they are located.

The components of major assets that have materially different useful lives, are effectively accounted for as separate assets, and are separately depreciated.

(ii) Leased assets

Leases in terms of which the consolidated entity assumes substantially all the risks and rewards of ownership are classified as finance leases. Lease payments are accounted for as described in accounting policy (r).

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

1. Significant accounting policies (continued)

(g) Property, plant and equipment (continued)

(iii) Subsequent costs

The consolidated entity recognises in the carrying amount of an item of property, plant and equipment the cost of replacing part of such an item when that cost is incurred if it is probable that the future economic benefits embodied within the item will flow to the consolidated entity and the cost of the item can be measured reliably. All other costs are recognised in the income statement as an expense as incurred.

(iv) Depreciation and amortisation

All assets, including intangibles, have limited useful lives and are depreciated/amortised using the straight line method over their estimated useful lives, taking into account estimated residual values, with the exception of carried forward exploration, evaluation and development expenditure in the production phase which is amortised on a units of production method based on the ratio of actual production to remaining proved reserves (1P) as estimated by independent petroleum engineers, and finance lease assets which are amortised over the term of the relevant lease, or where it is likely the consolidated entity will obtain ownership of the asset, the life of the asset.

Assets are depreciated or amortised from the date of acquisition or, in respect of internally constructed assets, from the time an asset is completed and held ready for use.

Amortisation is not charged on costs carried forward in respect of areas of interest in the development phase until commercial production commences.

Depreciation and amortisation rates and methods are reviewed annually for appropriateness. When changes are made, adjustments are reflected prospectively in current and future periods only. Depreciation and amortisation are expensed, except to the extent that they are included in the carrying amount of another asset as an allocation of production overheads.

The residual value, if not insignificant, is reassessed annually.

The estimated useful lives or the amortisation method used for each class of asset in the current and comparative period are as follows:

	2005	2004
Exploration, evaluation and development expenditure
Exploration, evaluation and development expenditure in the production phase	Units of production	Units of production
Intangible assets
Software	3 – 5 years	3 – 5 years
Property, plant and equipment
Furniture and fittings	5 – 8 years	5 – 8 years
Office equipment	3 – 4 years	3 – 4 years
Leasehold improvements	5 – 7 years	5 – 7 years

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

1. Significant accounting policies (continued)

(h) Impairment of assets

Assets that have an indefinite useful life are not subject to amortisation and are systematically tested annually for impairment at each balance sheet date. Assets that are subject to amortisation are reviewed for impairment whenever events of changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is recognised for the amount by which the asset’s carrying amount exceeds its recoverable amount. The recoverable amount is the higher of an asset’s fair value less costs to sell and value in use. For the purpose of assessing impairment, assets are grouped at the lowest levels for which there are separately identifiable cash flows (cash-generating units). For the consolidated entity, cash-generating units are the lowest level separately assessed as an area of interest.

Reversals of impairment

An impairment loss in respect of an investment in an equity instrument classified as available-for-sale [see note 1(k)] is not reversed through profit or loss.

In respect of other assets, an impairment loss is reversed through the income statement if there has been a change in the estimates used to determine the recoverable amount. An impairment loss is reversed only to the extent that the asset’s carrying amount does not exceed the carrying amount that would have been determined, net of depreciation or amortisation, if no impairment loss had been recognised.

(i) Exploration and evaluation – Intangible assets

Intangible assets that are acquired by the consolidated entity are stated at cost less impairment losses [see note 1(h)]. These costs include lease acquisition costs, delay rentals and seismic costs for unproved areas where exploration rights have been obtained.

(j) Calculation of recoverable amounts

In assessing value in use, the estimated future cash flows are discounted to their present value using a pre-tax discount rate that reflects current market assessments of the time value of money and the risks specific to the asset.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

1. Significant accounting policies (continued)

(k) Investments

Current period policy

All investments are initially recognised at cost, being the fair value of the consideration given and including acquisition charges associated with the investment, and are classified as non-current assets.

After initial recognition, investments, which are classified as held for trading and available-for-sale, are measured at fair value. Gains or losses on investments held for trading are recognised in the income statement.

Gains or losses on available-for-sale investments are recognised as a separate component of equity until the investment is sold, collected or otherwise disposed of, or until the investment is determined to be impaired, at which time the cumulative gain or loss previously reported in equity is included in the income statement. Where these investments are interest-bearing, interest calculated using the effective interest method is recognised in the income statement.

For investments that are actively traded in organised financial markets, fair value is determined by reference to Stock Exchange quoted market bid prices at the close of business on the balance sheet date.

For investments where there is no quoted market price, fair value is determined by reference to the current market value of another instrument which is substantially the same or is calculated based on the expected cash flows of the underlying net asset base of the investment.

Purchases and sales of financial assets that require delivery of assets within the time frame generally established by regulation or convention in the market place are recognised on the trade date i.e. the date that the Group commits to purchase the asset.

Comparative period policy

Investments in other listed entities are measured at the lower of cost and fair value, being the current quoted market prices.

Investments in other unlisted entities are carried at the lower of cost and estimated recoverable amount.

The quantitative effect of the change in accounting policy is set out in note 12.

(l) Trade and other receivables

Trade receivables, which generally have 30-60 day terms, are recognised and carried at original invoice amount less an allowance for any uncollectible amounts.

An estimate for doubtful debts is made when collection of the full amount is no longer probable. Bad debts are written off when identified.

(m) Cash and cash equivalents

Cash and cash equivalents in the balance sheet comprise cash at bank and in hand and short-term deposits with an original maturity of three months or less.

For the purposes of the Condensed Consolidated Interim Statement of Cash Flows, cash and cash equivalents consist of cash and cash equivalents as defined above, net of outstanding bank overdrafts.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

1. Significant accounting policies (continued)

(n) Interest-bearing loans and borrowings

Current period policy

All loans and borrowings are initially recognised at cost, being the fair value of the consideration received net of issue costs associated with the borrowing.

After initial recognition, interest-bearing loans and borrowings are subsequently measured at amortised cost using the effective interest method. Amortised cost is calculated by taking into account any issue costs, and any discount or premium on settlement.

Gains and losses are recognised in the income statement when the liabilities are derecognised as well as through the amortisation process.

Comparative period policy

Interest-bearing liabilities are recognised at their principal amount. Interest expense is accrued at the contracted rate.

(o) Borrowing costs

Borrowing costs comprise interest payable on borrowings calculated using the effective interest rate method, lease finance charges and amortisation of discounts or premiums relating to borrowings. Borrowing costs are expensed as incurred unless they relate to qualifying assets.

(p) Provisions

A provision is recognised in the balance sheet when the consolidated entity has a present legal or constructive obligation as a result of a past event, and it is probable that an outflow of economic benefits will be required to settle the obligation. If the effect of the time value of money is material, provisions are determined by discounting the expected future cash flows at a pre-tax rate that reflects current market assessments of the time value of money and, where appropriate, the risks specific to the liability.

Where discounting is used, the increase in the provision due to the passage of time is recognised as a finance cost.

(i) Rehabilitation

The consolidated entity recognises a provision for the legal obligation associated with the retirement of a long-lived assets that results from the acquisition, construction, development, and (or) the normal operation of oil and natural gas properties.

(q) Employee benefits and director benefits

(i) Wages and salaries, annual leave and sick leave

Liabilities for wages and salaries and annual leave expected to be settled within 12 months of the reporting date are recognised in other payables in respect of employees’ services up to the reporting date and are measured at the amounts expected to be paid when liabilities are settled. Liabilities for non-accumulating sick leave are recognised when the leave is taken and measured at the rates paid or payable.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

1. Significant accounting policies (continued)

(q) Employee benefits and director benefits (continued)

(ii) Long service leave

The provision for employee benefits to long service leave represents the present value of the estimated future cash outflows to be made resulting from employees’ services provided to reporting date.

The provision is calculated using expected future increases in wage and salary rates including related on-costs and expected settlement dates based on turnover history and is discounted using the rates attaching to national government bonds at reporting date which most closely match the terms of maturity of the related liabilities.

(iii) Defined contribution plans

The Company and other controlled entities contribute to several defined contribution pension plans. Obligations for contributions to defined contribution pension plans are recognised as an expense in the income statement as incurred.

(iv) Employee incentive plans

A liability is recognised for employee incentive plans for U.S. employees based on a percentage of operating profits.

(v) Share-based compensation transactions

Share-based compensation benefits are provided to employees of the consolidated entity, including directors via the Company’s Employee Option Plan and Employee Share Plan.

The fair value of options granted under the Company’s Employee Option Plan is recognised as an employee benefit expense with a corresponding increase in equity. The fair value is measured at grant date and recognised over the period during which the employees become unconditionally entitled to the options.

The fair value at grant date is independently determined using a Black-Scholes option pricing model that takes into account the exercise price, the term of the option, the vesting and performance criteria, the impact of dilution, the non-tradeable nature of the option, the share price at grant date and expected price volatility of the underlying share, the expected dividend yield and the risk-free interest rate for the term of the option.

The fair value of the options granted excludes the impact of any non-market vesting conditions (for example, profitability and sales growth targets). Non-marketing vesting conditions are included in assumptions about the number of options that are expected to become exercisable. At each balance sheet date, the entity revises its estimate of the number of options that are expected to become exercisable. The employee benefit expense recognised each period takes into account the most recent estimate.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

1. Significant accounting policies (continued)

(r) Leases

Finance leases, which transfer to the consolidated entity substantially all the risks and benefits incidental to ownership of the leased item, are capitalised at the inception of the lease at the fair value of the leased property or, if lower, at the present value of the minimum lease payments.

Lease payments are apportioned between the finance charges and reduction of the lease liability so as to achieve a constant rate of interest on the remaining balance of the liability. Finance charges are charged directly against income.

Capitalised leased assets are depreciated over the shorter of the estimated useful life of the asset or the lease term.

Leases where the lessor retains substantially all the risks and benefits of ownership of the asset are classified as operating leases.

Operating lease payments are recognised as an expense in the income statement on a straight-line basis over the lease term.

(s) Revenue recognition

Revenue is recognised to the extent that it is probable that the economic benefits will flow to the consolidated entity and the revenue can be reliably measured. The following specific recognition criteria must also be met before revenue is recognised:

Sale of oil and gas

Revenues are recognised when the product is in the form in which it is to be delivered and an actual physical quantity has been provided or allocated to a purchaser pursuant to a contract. Revenue from oil and gas sales is measured at the fair value of the consideration receivable.

Revenue from oil and gas royalties is recognised on an accrual basis in accordance with the terms of underlying royalty agreements. Revenue from oil and gas royalties is measured at the fair value of the consideration receivable.

Interest

Revenue is recognised as the interest accrues (using the effective interest method, which is the rate that exactly discounts estimated future cash receipts through the expected life of the financial instrument).

Sale of non-current assets

The gross proceeds of non-current asset sales, net of carrying value of non-current assets sold including incidental costs, are recognised as other income at the date control of the asset passes to the buyer, usually when an unconditional contract of sale is signed.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

1. Significant accounting policies (continued)

(t) Income tax

Income tax on the profit or loss for the periods presented comprises current and deferred tax. Income tax is recognised in the income statement except to the extent that it relates to items recognised directly in equity, in which case it is recognised in equity.

Current tax is the expected tax payable on the taxable income for the year, using tax rates enacted or substantially enacted at the balance sheet date, and any adjustment to tax payable in respect of previous years.

Deferred tax is provided using the balance sheet liability method, providing for temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for taxation purposes. The following temporary differences are not provided for: goodwill not deductible for tax purposes, the initial recognition of assets or liabilities that affect neither accounting nor taxable profit, and differences relating to investments in subsidiaries to the extent that they will probably not reverse in the foreseeable future. The amount of deferred tax provided is based on the expected manner of realisation or settlement of the carrying amount of assets and liabilities, using tax rates enacted or substantively enacted at the balance sheet date.

A deferred tax asset is recognised only to the extent that it is probable that future taxable profits will be available against which the asset can be utilised. Deferred tax assets are reduced to the extent that it is no longer probable that the related tax benefit will be realised.

Tax consolidation -UIG interpretation 1052

The Company is the head entity in a tax-consolidated group comprising the Company and all of its Australian wholly owned subsidiaries. The implementation date for the tax-consolidated group was 1 July 2002.

The current and deferred tax amounts for the tax-consolidated group are allocated among the entities in the group such that each entity in the tax-consolidated group measures its current and deferred taxes as if it continued to be a separately taxable entity in its own right. Deferred tax assets and deferred tax liabilities are measured by reference to the carrying amounts of the assets and liabilities in the respective entity’s balance sheet and their tax values applying under tax consolidation.

Any current tax liabilities (or assets) and deferred tax assets arising from unused tax losses assumed by the head entity from the subsidiaries in the tax consolidated group are recognised in conjunction with any tax funding arrangement amounts (refer below). Any difference between these amounts is recognised by the Company as an equity contribution to or distribution from the subsidiary. Distributions firstly reduce the carrying amount of the investment in the subsidiary and are then recognised as revenue.

The Company recognises deferred tax assets arising from unused tax losses of the tax-consolidated group to the extent that it is probable that future taxable profits of the tax-consolidated group will be available against which the asset can be utilised. Any subsequent period adjustments to deferred tax assets arising from unused tax losses assumed from subsidiaries are recognised by the head entity only.

PETSEC ENERGY LTD

(t) Income tax (continued)

Tax consolidation —UIG interpretation 1052 (continued)

The members of the tax-consolidated group have entered into a tax funding arrangement which sets out the funding obligations of members of the tax-consolidated group in respect of tax amounts. The tax funding arrangements require payments to/from the head entity equal to the current tax liability (asset) assumed by the head entity and any tax-loss deferred tax asset assumed by the head entity. The members of the tax-consolidated group have also entered into a valid Tax Sharing Agreement under the tax consolidation legislation which sets out the allocation of income tax liabilities between the entities should the head entity default on its tax payment obligations and the treatment of entities leaving the tax consolidated group.

(u) Goods and services tax

Revenues, expenses and assets are recognised net of the amount of goods and services tax (“GST”), except where the amount of GST incurred on a purchase of goods and services is not recoverable from the taxation authority, in which case the GST is recognised as part of the cost of acquisition of the asset or as part of the expense item as applicable.

Receivables and payables are stated with the amount of GST included. The net amount of GST recoverable from, or payable to, the taxation authority is included as part of receivables or payables in the balance sheet.

Cash flows are included in the Condensed Consolidated Statement of Cash Flows on a gross basis and the GST component of cash flows arising from investing and financing activities, which is recoverable from, or payable to, the taxation authority are classified as operating cash flows.

(v) Segment reporting

A segment is a distinguishable component of the consolidated entity that is engaged in providing products or services within a particular economic environment (geographical segment), which is subject to risks and rewards that are different from those of other segments.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

2. Profit for the period

	Six months
	2005		2004
	US$’000		US$’000
Profit for the period includes the following items that are unusual because of their nature, size or incidence:
Expenses
Profit before income tax includes the following specific expenses:
Dry hole and impairment expense (1)		8,421		1,270
Major maintenance expense		—		568
		8,421		1,838

(1) During the current period, the consolidated entity expensed all costs incurred to-date in respect of its share of the Price Lake field, onshore Louisiana. Two wells, which commenced drilling in September 2004 and December 2004, respectively, encountered hydrocarbon-bearing sands and were completed for production during the first half of 2005. The reserves discovered, however, subsequently proved to be uneconomic and as a result, the wells were determined to be dry holes.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

3. Earnings per share

The Company has only one type of security, being ordinary shares, included in the basic earnings per share calculation.

An additional 2,998,000 options outstanding under the Employee Option Plan have been classified as potential ordinary shares and are included in diluted earnings per share for ordinary shares only.

During the half year, 670,000 options were converted to ordinary shares.

Subsequent to 30 June 2005, 580,000 options have been exercised.

Further details of these securities are contained in Note 4 (Issued Capital).

	Six months
	2005		2004
	US$’000		US$’000
Profit attributable to ordinary shareholders
For the six months ended 30 June 2005
Net profit		7,684		163
Earnings used to calculate basic and diluted earnings per share		7,684		163

	Six months
	2005		2004
	No. of shares		No. of shares
Weighted average number of shares
For the six months ended 30 June 2005
Number for basic earnings per share
Ordinary shares		119,416,018		118,447,000
Number for diluted earnings per share
Ordinary share number		119,416,018		118,447,000
Effect of employee options on issue		1,918,950		2,556,906
		121,334,968		121,003,906

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

4. Issued Capital

	Jun 2005		Dec 2004
	US$’000		US$’000
Ordinary shares
Issued and fully paid		116,354		116,193

	No. of shares
	in thousands		US$’000
Movements in ordinary shares on issue
Issued ordinary shares at 1 January 2005		119,223		116,193
Issued during year for cash on exercise of share options		670		161
Issued ordinary shares at 30 June 2005		119,893		116,354

At 30 June 2005, there were the following unexercised employee options to purchase the Company’s ordinary shares:

		Number of shares		Exercise price
Date of grant	Expiry date	under option		of options
3 June 2002	1 June 2007		2,375,000		A$0.30
1 April 2003	1 December 2007		138,000		A$0.40
1 April 2003	1 April 2008		75,000		A$0.40
25 August 2003	31 December 2007		150,000		A$0.82
16 January 2004	30 November 2008		15,000		A$0.83
8 March 2004	1 March 2009		15,000		A$1.25
16 September 2004	30 June 2009		150,000		A$1.00
31 October 2004	31 July 2009		50,000		A$1.25
25 February 2005	31 December 2009		15,000		A$1.15
28 June 2005	1 June 2010		15,000		A$1.10
			2,998,000

The options become exercisable at various dates and after various share price hurdles of the Company have been reached.

During the half year, 30,000 options were granted (2004: 30,000), 670,000 options were exercised and converted to ordinary shares (2004: 611,000) and no options were cancelled (2004: Nil).

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

5.		Segment reporting
		Segment information is presented in the condensed consolidated interim financial statements in respect of the consolidated entity’s geographic segments, which are the primary basis of segment reporting.
		Segment results include items directly attributable to a segment as well as those that can be allocated on a reasonable basis. Unallocated items comprise mainly income-earning assets and revenue and deferred tax balances. Segment acquisition of property, plant & equipment, intangibles and exploration, evaluation and development assets is the total cost incurred during the period to acquire segment assets that are expected to be used for more than one period.
		In presenting information on the basis of geographical segments, segment revenue and assets are based on the geographical location of operations.

Primary reporting format	Australia						USA						China						Consolidated
Geographic segments	30 Jun 2005			30 Jun 2004			30 Jun 2005			30 Jun 2004			30 Jun 2005			30 Jun 2004			30 Jun 2005			30 Jun 2004
	US$’000			US$’000			US$’000			US$’000			US$’000			US$’000			A$’000			US$’000
Oil & gas sales and royalties		—			—			32,696			14,584			—			—			32,696			14,584
Royalties paid		—			—			(1,080	)		(2,728	)		—			—			(1,080	)		(2,728	)
Net revenues after royalties		—			—			31,616			11,856			—			—			31,616			11,856
Unallocated revenues																				225			161
Total revenues *																				31,841			12,017
Segment result from continuing operations		(752	)		(467	)		8,066			2,502			(87	)		(1,514	)		7,227			521
Income tax benefit/(expense)																				457			(358	)
Profit after tax																				7,684			163
Depreciation and amortisation		13			12			12,242			6,486			—			—			12,255			6,498
Dry hole costs and impairment expense		—			—			8,417			—			4			1,270			8,421			1,270
Major maintenance expense		—			—			—			568			—			—			—			568
Segment assets		727			742			48,629			29,130			2,300			2,167			51,656			32,039
Unallocated assets																				29,835			8,740
Total assets																				81,491			40,779
Acquisition of property, plant & equipment, intangibles and exploration, evaluation and development assets		—			21			22,762			12,567			162			1,402			22,924			13,990

* There are no inter-segment sales

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

6. Interests in unincorporated joint operating arrangements

Included in the assets of the consolidated entity are the following items which represent the consolidated entity’s interest in the assets and liabilities in joint operating arrangements:

	As at
	30 June			31 December
	2005			2004
	US$’000			US$’000
Exploration, evaluation and development expenditure (tangible and intangible):
Now in production at cost
— West Cameron 343		10,918			10,097
— West Cameron 352		8,102			8,048
Less: accumulated amortisation		(16,421	)		(14,603	)
		2,599			3,542
Not in production
— Main Pass 89		174			151
— Main Pass 19 (1)		8,340			1,555
— Block 22/12 Beibu Gulf		2,300			2,142
— Price Lake, Onshore Louisiana (2)		—			3,188
— St James Parish, Onshore Louisiana		6,024			2,519
		16,838			9,555
Total lease permits and capital expenditure		19,437			13,097

	Six months to
	30 June 2005			30 June 2004
	US$’000			US$’000
The contribution of the consolidated entity’s joint operating arrangements to EBIT:
— West Cameron 343		1,623			4,387
— West Cameron 352		1,165			153
— Block 22/12 Beibu Gulf		(87	)		(1,514	)
		2,701			3,026

The principal activity of all the joint operating arrangements is oil & gas exploration. Listed below is the name of each of the joint operating arrangement and the percentage interest held in the joint operating arrangement by the consolidated entity:

	Interest			Interest
	held			held
	2005			2004
Main Pass 89		30.0	%		30.0	%
Main Pass 19 (1)		55.0	%		55.0	%
West Cameron 343		75.0% to 100	%		75.0% to 100	%
West Cameron 352		56.3	%%		56.3	%
Block 22/12 Beibu Gulf		25.0	%		25.0	%
Price Lake, Onshore Louisiana (2)		25.0	%		—
St James Parish, Onshore Louisiana		50.0	%		—

(1)		Three wells were successfully drilled during the current half-year period. The Company expects to bring all these wells into production during 4th Qtr 2005.
(2)		During the current period, the Company expensed the total cost incurred in respect of this joint operating arrangement. Subsequent to report date, the Company relinquished its entire 25.0% interest.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

7. Wholly owned area of interests in production

Included in the assets of the consolidated entity are the following items which represent the consolidated entity’s wholly owned area of interests now in production:

	As at
	30 June			31 December
	2005			2004
	US$’000			US$’000
Exploration, evaluation and development expenditure (tangible and intangible):
Now in production at cost
— Vermilion 258 (1)		32,357			21,655
Less: accumulated amortisation		(14,496	)		(3,837	)
Total lease permits and capital expenditure		17,861			17,818

	Six months
	30 June 2005		30 June 2004
	US$’000		US$’000
The contribution of the consolidated entity’s area of interests now in production to EBIT:
— Vermilion 258 (1)		13,946		—

(1) Commenced production in July 2004.

8. Contingent assets and liabilities

Since the last annual reporting date, there has been no material change of any contingent liabilities or contingent assets.

9. Changes in composition of the consolidated entity

During the period the consolidated entity had no non-current assets held for sale and did not dispose of any operation. During the period the consolidated entity did not obtain control over any additional operations.

10. Dividends

No interim dividend is to be paid on the ordinary shares (previous corresponding period: Nil). No dividend or distribution plans are currently in operation.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

11. Explanation of transition to AIFRSs

As stated in significant accounting policies note 1(a), these are the consolidated entity’s first condensed consolidated interim financial statements prepared in accordance with AIFRSs.

The policies set out in the significant accounting policies section of this report have been applied in preparing the condensed consolidated interim financial statements for the six months ended 30 June 2005, the comparative information presented in these financial statements for the six months ended 30 June 2004, the financial statements for the year ended 31 December 2004 and in the preparation of an opening AIFRS balance sheet at 1 January 2004 (the consolidated entity’s date of transition).

In preparing its opening AIFRS balance sheet, the consolidated entity has adjusted amounts reported previously in financial statements prepared in accordance with its old basis of accounting (previous GAAP). An explanation of how the transition from previous GAAP to AIFRSs has affected the consolidated entity’s financial position, financial performance and cash flows is set out in the following tables and the notes that accompany the tables.

AASB 1 transitional adjustments

The consolidated entity has made its election in relation to the transitional exemptions allowed by AASB 1 First-time adoption of Australian Equivalents to International Financial Reporting Standards as follows:

Reconstructed cost, fair value or revaluation as deemed cost

The consolidated entity has not elected to reset the cost base of its assets and has instead adopted the “reconstructed” A-IFRS cost of the assets. This election has no impact on transition.

Cumulative translation differences

The consolidated entity has elected to apply this exemption and reset the balance of the currency translation reserve to zero at the date of transition to AIFRS.

Financial instruments

The consolidated entity has elected not to restate comparatives available under AASB 132 Financial Instruments: Presentation and Disclosure and AASB 139 Financial Instruments: Recognition and Measurement and has applied the Standards from 1 January 2005.

Share-based payment transactions

The consolidated entity has not elected to adopt this exemption and has applied AASB 2 Share-based payments to recognition and measurement requirements regarding share-based payments retrospectively to:

— equity instruments that were granted on or before 7 November 2002; — equity instruments that were granted after 7 November 2002 that vested before the later of the date of transition to AIFRSs and 1 January 2005; and — liabilities arising from share-based payment transactions that were settled before the later of the date of transition to AIFRSs and 1 January 2005.

Exploration for and evaluation of mineral resources

The consolidated entity has elected to apply AASB 6 to the comparative period.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

11. Explanation of transition to AIFRSs (continued)

Reconciliation of equity

						Effect of									Effect of									Effect of
		Previous		Previous		transition					Previous		Previous		transition					Previous		Previous		transition
		GAAP		GAAP *		to AIFRSs			AIFRSs		GAAP		GAAP *		to AIFRSs			AIFRSs		GAAP		GAAP *		to AIFRSs			AIFRSs
	Notes	A$000’s		US$000’s		US$000’s			US$000’s		A$000’s		US$000’s		US$000’s			US$000’s		A$000’s		US$000’s		US$000’s			US$000’s
		1 January 2004									30 June 2004									31 December 2004
Assets
Cash and cash equivalents			16,770		12,462		—			12,462		12,686		8,740		—			8,740		12,227		9,517		—			9,517
Trade and other receivables			5,582		4,148		—			4,148		6,022		4,149		—			4,149		8,940		6,959		—			6,959
Prepayments			493		367		—			367		393		271		—			271		2,590		2,016		—			2,016
Total current assets			22,845		16,977		—			16,977		19,101		13,160		—			13,160		23,757		18,492		—			18,492
Receivables			2,334		1,734		—			1,734		344		237		—			237		—		—		—			—
Other investments			464		345		—			345		640		441		—			441		698		543		—			543
Property, plant & equipment	(a)		310		230		(86	)		144		592		408		(92	)		316		314		245		(79	)		166
Exploration, evaluation and development expenditure — Tangible	(b), (d), (i)		28,563		21,225		(2,622	)		18,603		40,654		28,011		(3,865	)		24,146		50,562		39,358		(6,713	)		32,645
Exploration and evaluation expenditure — Intangible	(b)		—		—		1,533			1,533		—		—		2,706			2,706		—		—		5,407			5,407
Intangible assets	(a)		—		—		86			86		—		—		92			92		—		—		79			79
Deferred tax asset	(c)		499		371		—			371				—		—			—		—		—		12,964			12,964
Other financial assets			—		—		—			—		71		49		—			49		45		35		—			35
Total non-current assets			32,170		23,905		(1,089	)		22,816		42,301		29,146		(1,159	)		27,987		51,619		40,181		11,658			51,839
Total assets			55,015		40,882		(1,089	)		39,793		61,402		42,306		(1,159	)		41,147		75,376		58,673		11,658			70,331

* The previous GAAP US$ position is after a change in presentational currency from A$ to US$ at FX rates of: i) 1 Jan 04 — 0.7431 ii) 30 June 2004 — 0.689 iii) 31 December 2004 — 0.7784.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

11. Explanation of transition to AIFRSs (continued)

Reconciliation of equity (continued)

								Effect of												Effect of												Effect of
		Previous			Previous			transition						Previous			Previous			transition						Previous			Previous			transition to
		GAAP			GAAP *			to AIFRSs			AIFRSs			GAAP			GAAP *			to AIFRSs			AIFRSs			GAAP			GAAP *			AIFRSs			AIFRSs
	Notes	A$000’s			US$000’s			US$000’s			US$000’s			A$000’s			US$000’s			US$000’s			US$000’s			A$000’s			US$000’s			US$000’s			US$000’s
		1 January 2004												30 June 2004												31 December 2004
Liabilities
Trade and other payables			18,839			14,000			—			14,000			10,160			7,000			—			7,000			13,279			10,337			—			10,337
Interest-bearing loans and borrowings			441			328			—			328						—			—			—			1,509			1,175			—			1,175
Employee benefits			51			38			—			38			52			36			—			36			48			37			—			37
Total current liabilities			19,331			14,366			—			14,366			10,212			7,036			—			7,036			14,836			11,549			—			11,549
Deferred tax liabilities	(c)		15			11			—			11			—			—			—			—						—			5,239			5,239
Rehabilitation provision	(d)		135			100			181			281			293			202			398			600			696			541			270			811
Employee benefits			334			248			—			248			335			231			—			231			343			267			—			267
Total non-current liabilities			484			359			181			540			628			433			398			831			1,039			808			5,509			6,317
Total liabilities			19,815			14,725			181			14,906			10,840			7,469			398			7,867			15,875			12,357			5,509			17,866
Net assets			35,200			26,157			(1,270	)		24,887			50,562			34,837			(1,557	)		33,280			59,501			46,316			6,149			52,465
Equity
Issued capital			144,120			107,095			—			107,095			155,957			116,177			—			116,177			155,979			116,193			—			116,193
Reserves	(e)		(1,908	)		(1,418	)		7,623			6,205			936			541			7,672			8,213			(5,289	)		(4,050	)		7,730			3,680
Presentation currency reserves			—			2,081			—			2,081			—			(779	)					(779	)		—			4,158						4,158
Accumulated losses	(f)		(107,012	)		(81,601	)		(8,893	)		(90,494	)		(106,331	)		(81,102	)		(9,229	)		(90,331	)		(91,189	)		(69,985	)		(1,581	)		(71,566	)
Total equity			35,200			26,157			(1,270	)		24,887			50,562			34,837			(1,557	)		33,280			59,501			46,316			6,149			52,465

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

11. Explanation of transition to AIFRSs (continued)

Notes to the reconciliation of equity

(a) Property, plant and equipment

In accordance with AASB 116 Property, Plant and Equipment, application software assets have been reclassified within the balance sheet from property, plant and equipment to intangible assets. Under previous GAAP, there was no requirement to reclassify these assets as intangible.

The effect of this is:

(i) At 1 January 2004

For the consolidated entity there has been an increase in intangible assets of $86,000 and a corresponding decrease in property, plant and equipment.

(ii) At 30 June 2004

For the consolidated entity there has been an increase in intangible assets of $92,000 and a corresponding decrease in property, plant and equipment.

(iii) At 31 December 2004

For the consolidated entity there has been an increase in intangible assets of $79,000 and a corresponding decrease in property, plant and equipment.

(b) Exploration, evaluation and development expenditure

Under AASB 6 Exploration for and Evaluation of Mineral Resources, exploration and evaluation assets are required to be classified as either tangible or intangible according to the nature of the assets acquired. The standard also prescribes that the classification be applied consistently as the classification of these assets will determine the relevant standard that needs to be applied in accounting for the expenditure.

The effect of this is:

(i) At 1 January 2004

For the consolidated entity there has been an increase in exploration and evaluation - intangible assets of $1,533,000 and a corresponding decrease in exploration, evaluation and development expenditure.

(ii) At 30 June 2004

For the consolidated entity there has been an increase in exploration and evaluation - intangible assets of $2,706,000 and a corresponding decrease in exploration, evaluation and development expenditure.

(iii) At 31 December 2004

For the consolidated entity there has been an increase in exploration and evaluation - intangible assets of $5,407,000 and a corresponding decrease in exploration, evaluation and development expenditure.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

11. Explanation of transition to AIFRSs (continued)

Notes to the reconciliation of equity (continued)

Under previous GAAP, income tax expense was calculated by reference to the accounting profit after allowing for permanent differences. Deferred tax was not recognised in relation to amounts recognised directly in equity. The adoption of AIFRS has resulted in a change in accounting policy.

The application of AASB 112 Income Taxes had no effect on the deferred tax balances in relation to amounts recognised directly in equity prior to 1 January 2005 as the consolidated entity had no fair value adjustments prior to this date.

Furthermore, under previous GAAP the consolidated entity did not recognise a deferred tax asset for the carryforward of unused tax losses. In accordance with AIFRSs such losses are recognised as deferred tax losses to the extent that it is probable that future taxable profits will be available against which the asset can be utilised. For the consolidated entity, this change had no effect until the period ended 31 December 2004. The effect on the restated AIFRS income statement for the year ended 31 December 2004 was a tax benefit for the period of $7,725,000 in the consolidated entity resulting from the recognition of 80% of U.S. available tax losses, based on an assessment of probable future assessable income; this net amount is reflected in the balance sheet at 31 December 2004 as a non-current deferred tax asset of $12,964,000 and a non-current deferred tax liability of $5,239,000.

(d) Rehabilitation provision

In accordance with AASB 137 Provisions, Contingent Liabilities and Contingent Assets, a provision is required to be recognised where a present obligation (constructive or legal) arises from a past event. An obligation exists to restore certain sites for the effect of the consolidated entity’s operations. Further, it must take into consideration any risks and uncertainties and must be discounted to its present value when the effect of the time value of money is material. Under previous GAAP, the cost of rectification was recognised progressively over the life of the production facility on an undiscounted basis.

For the consolidated entity, this standard applies to the recognition of the rehabilitation provision in respect of currently producing leases. The effect of this is:

(i) At 1 January 2004

For the consolidated entity there has been an increase in rehabilitation provision asset of $163,000, an increase in the rehabilitation provision liability of $181,000 and an increase in accumulated losses of $18,000.

(ii) At 30 June 2004

For the consolidated entity there has been an increase in rehabilitation provision asset of $368,000, an increase in the rehabilitation provision liability of $398,000 and an increase in accumulated losses of $30,000 (including $12,000 in respect of the six months ended 30 June 2004).

(iii) At 31 December 2004

For the consolidated entity there has been an increase in rehabilitation provision asset of $441,000, an increase in the rehabilitation provision liability of $270,000 and a decrease in accumulated losses of $171,000 (including a net $189,000 in respect of the year ended 31 December 2004).

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

11. Explanation of transition to AIFRSs (continued)

(e) Reserves

The effect on reserves of the changes resulting from the adoption of AIFRS, are as follows:

				1 January		30 June		31 December
				2004		2004		2004
In thousands of USD	Notes			US$’000		US$’000		US$’00
Foreign currency translation reserve		(g	)		7,438		7,438		7,438
Share-based compensation		(h	)		185		234		292
Total adjustment to reserves					7,623		7,672		7,730

(f) Accumulated losses

The effect on accumulated losses of the changes resulting from the adoption of AIFRS, are as follows:

				1 January			30 June			31 December
				2004			2004			2004
In thousands of USD	Notes			US$’000			US$’000			US$’000
Foreign currency translation reserve		(g	)		(7,438	)		(7,438	)		(7,438	)
Share-based compensation		(h	)		(185	)		(234	)		(292	)
Exploration , evaluation and development costs		(i	)		(1,252	)		(1,527	)		(1,747	)
Rehabilitation provision asset/(liability)		(d	)		(18	)		(30	)		171
Deferred tax		(c	)		—			—			7,725
Total adjustment to equity					(8,893	)		(9,229	)		(1,581	)

(g) Foreign currency translation reserve

The consolidated entity has elected to apply the exemption in AASB 1 First-time adoption of Australian Equivalents to International Financial Reporting Standards. The cumulative translation differences for all foreign operations represented in the foreign currency translation reserve are deemed to be zero at the date of transition to AIFRSs. The effect is:

(i) At 1 January 2004

For the consolidated entity the balance of the $7,438,000 debit in the foreign currency translation reserve is reduced to zero. Accumulated losses is increased by this amount.

(ii) At 30 June 2004

For the consolidated entity the balance of the $7,438,000 debit in the foreign currency translation reserve results from the opening accumulated losses as of 1 January 2004. Accumulated losses is increased by this amount.

(iii) At 31 December 2004

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

11. Explanation of transition to AIFRSs (continued)

(h) Share-based compensation

The consolidated entity has not elected to apply AASB 2 Share-based Payments exemption available under AASB 1 First-time adoption of Australian Equivalents to International Financial Reporting Standards. The effect of this is:

(i) At 1 January 2004

For the consolidated entity there has been an increase in accumulated losses of $185,000 and a corresponding increase in reserves.

(ii) At 30 June 2004

For the consolidated entity there has been an increase in accumulated losses of $234,000 and a corresponding increase in reserves (including $49,000 in respect of the six months ended 30 June 2004).

(iii) At 31 December 2004

For the consolidated entity there has been an increase in accumulated losses of $292,000 and a corresponding increase in reserves (including $107,000 in respect of the year ended 31 December 2004).

(i) Exploration, evaluation and development expenditure

Under AASB 6 Exploration for and Evaluation of Mineral Resources the consolidated entity is required to expense as incurred the cost of seismic held over areas where there is no legal right to explore as well as geological, geophysical and administrative expenditures indirectly related to operational activities. The effect of this is:

(i) At 1 January 2004

For the consolidated entity there has been an increase in accumulated losses of $1,252,000 and a corresponding decrease in the capitalised amount of exploration, evaluation and development expenditure.

(ii) At 30 June 2004

For the consolidated entity there has been an increase in accumulated losses of $1,527,000 ($275,000 of the increase is reflected in the 2004 half-year profit) and a corresponding decrease in the capitalised amount of exploration, evaluation and development expenditure (including $275,000 in respect of the six months ended 30 June 2004, comprising $160,000 relating to seismic costs and $115,000 relating to geological, geophysical and administrative expenditures).

(iii) At 31 December 2004

For the consolidated entity there has been a increase in accumulated losses of $1,747,000 ($495,000 of the increase is reflected in 2004 profits) and a corresponding decrease in the capitalised amount of exploration, evaluation and development expenditure (including $495,000 in respect of the year ended 31 December 2004, comprising $349,000 relating to seismic costs and $146,000 relating to geological, geophysical and administrative expenditures).

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

11. Explanation of transition to AIFRSs (continued)

Reconciliation of profit for 2004

										Effect of												Effect of
				Previous			Previous			transition						Previous			Previous			transition
				GAAP			GAAP*			to AIFRSs			AIFRSs			GAAP			GAAP*			to AIFRSs			AIFRSs
	Notes			A$000’s			US$000’s			US$000’s			US$000’s			A$000’s			US$000’s			US$000’s			US$000’s
				For the six months ended 30 June 2004												For the year ended 31 December 2004
Revenue from the sale of oil & gas and royalties					19,918			14,584			—			14,584			54,366			39,910			—			39,910
Royalties paid					(3,726	)		(2,728	)		—			(2,728	)		(9,687	)		(7,111	)		—			(7,111	)
Net revenues after royalties					16,192			11,856			—			11,856			44,679			32,799			—			32,799
Other income					220			161			—			161			296			217			—			217
Total revenues					16,412			12,017			—			12,017			44,975			33,016			—			33,016
Lease operating expenses					(1,152	)		(844	)		—			(844	)		(2,419	)		(1,775	)		—			(1,775	)
Geological, geophysical and administrative expenses		(h),	(i)		(2,992	)		(2,190	)		(164	)		(2,354	)		(7,136	)		(5,239	)		(253	)		(5,492	)
EBITDAX					12,268			8,983			(164	)		8,819			35,420			26,002			(253	)		25,749
Depreciation, depletion and amortisation		(d	)		(8,875	)		(6,498	)		—			(6,498	)		(17,138	)		(12,582	)		239			(12,343	)
Exploration expenditure		(i	)		—			—			(160	)		(160	)		—			—			(349	)		(349	)
Dry hole costs and impairment expenses					(2,510	)		(1,838	)		—			(1,838	)		(2,350	)		(1,725	)		—			(1,725	)
EBIT					883			647			(324	)		323			15,932			11,695			(363	)		11,332
Financial income					294			215			—			215			423			311			—			311
Financial expense		(d	)		(7	)		(5	)		(12	)		(17	)		(43	)		(31	)		(50	)		(81	)
Net financial income					287			210			(12	)		198			380			280			(413	)		230
Profit before tax					1,170			857			(336	)		521			16,312			11,975			(413	)		11,562
Income tax expense		(c	)		(489	)		(358	)		—			(358	)		(489	)		(359	)		7,725			7,366
Profit for the period					681			499			(336	)		163			15,823			11,616			7,312			18,928

* The previous GAAP US$ position is after a change in presentational currency from A$ to US$ at FX rates of: i) 30 Jun 04 — 0.7322 ii) 31 December 2004 — 0.7341.

PETSEC ENERGY LTD

Notes to the condensed consolidated interim financial statements (continued) For the six months ended 30 June 2005

11. Explanation of transition to AIFRSs (continued)

Explanation of material adjustments to the cash flow statement for 2004

There are no material differences between the cash flow statement presented under AIFRSs and the cash flow statement presented under the previous GAAP.

12. Changes in accounting policy

In the current financial year the consolidated entity adopted AASB 132: Financial Instruments: Disclosure and Presentation and AASB 139: Financial Instruments: Recognition and Measurement. This change in accounting policy has been adopted in accordance with the transition rules contained in AASB 1, which does not require the restatement of comparative information for financial instruments within the scope of AASB 132 and AASB 139.

The adoption of AASB 139 has resulted in the consolidated entity recognising available-for-sale investments and all derivative financial instruments as assets or liabilities at fair value. This change has been accounted for by adjusting the opening balance of equity at 1 January 2005, as set out below:

The impact on the balance sheet in the comparative period is set out below as an adjustment to the opening balance sheet at 1 January 2005. The transitional provisions will not have any effect in future reporting periods.

Reconciliation of financial instruments as if AASB 139 was applied at 1 January 2005

Application of AASB 132 and AASB 139 prospectively from 1 January 2005

						Effect of
			Previous			transition to
In thousands of USD	Note		GAAP			AIFRSs			AIFRSs
Other financial assets		a		31			(31	)		—
Provision against securities		a		(31	)		31			—
Deferred tax asset		a		—			9			9
Fair value derivatives		b		—			1,406			1,406
Deferred tax liabilities		b		—			(555	)		(555	)
Hedging reserve		b		—			(851	)		(851	)
Fair value reserve		a					22			22
Accumulated losses		a		—			(31	)		(31	)

(a)		Under previous GAAP, the consolidated entity recorded available-for-sale equity securities at lower of cost or recoverable amount. In accordance with AIFRSs, they should be recognised at fair value.
		The effect in the consolidated entity is to decrease Other financial assets and Fair value reserve by $31,000 and $22,000, respectively ($31,000 less related deferred tax of $9,000) at 1 January 2005.
(b)		Under previous GAAP, the consolidated entity did not recognise derivatives at fair value on the balance sheet. In accordance with AIFRSs derivatives are now recognised at fair value.
		The effect in the consolidated entity is to increase Fair value derivatives and Hedging reserve by $1,406,000 and $851,000, respectively ($1,406,000 less related deferred tax of $555,000) at 1 January 2005.

PETSEC ENERGY LTD

Directors’ Declaration

In the opinion of the directors of Petsec Energy Ltd (“the company”):

(1) the financial statements and notes set out on pages 8 and 40, are in accordance with the Corporations Act 2001 including:

	(a)		giving a true and fair view of the financial position of the consolidated entity as at 30 June 2005 and of its performance, as represented by the results of its operations and cash flows for the half-year ended on that date; and
	(b)		complying with Australian Accounting Standard AASB 134 Interim Financial Reporting and the Corporations Regulation 2001; and

(2) there are reasonable grounds to believe that the company will be able to pay its debts as and when they become due and payable.

Signed in accordance with a resolution of the directors:

David A. Mortimer

Director

Sydney, 23 August 2005

PETSEC ENERGY LTD

Lead Auditor’s Independence Declaration under Section 307C of the Corporations Act 2001

To: the directors of Petsec Energy Ltd

I declare that, to the best of my knowledge and belief, in relation to the review for the financial half year ended 30 June 2005 there have been:

•		No contraventions of the auditor independence requirements as set out in the Corporations Act 2001 in relation to the audit; and
•		No contraventions of any applicable code of professional conduct in relation to the audit.

KPMG

Nicola Davis Partner

Sydney, 23rd day of August 2005

KPMG, an Australian partnership, is part of the KPMG International network. KPMG International is a Swiss cooperative.

PETSEC ENERGY LTD

Independent review report to the members of Petsec Energy Ltd

Scope

We have reviewed the financial report of Petsec Energy Ltd (“the Company”) for the half-year ended 30 June 2005, consisting of the condensed consolidated interim income statements, balance sheet, changes in equity, cash flows, accompanying notes 1 to 12 and the directors’ declaration. The financial report includes the consolidated financial statements of the consolidated entity comprising the Company and the entities it controlled at the end of the half-year or from time to time during the half-year. The Company’s directors are responsible for the financial report including the relevant reconciling information regarding adjustments required under—the Australian Accounting Standard AASB 1 First-Time Adoption of Australian equivalents to International Financial Reporting Standards.

We have performed an independent review of the financial report in order to state whether, on the basis of the procedures described, anything has come to our attention that would indicate that the financial report is not presented fairly in accordance with Australian Accounting Standard AASB 134 Interim Financial Reporting and other mandatory financial reporting requirements in Australia and statutory requirements, so as to present a view which is consistent with our understanding of the consolidated entity’s financial position, and performance as represented by the results of its operations and its cash flows and in order for the Company to lodge the financial report with the Australian Securities and Investments Commission.

Our review has been conducted in accordance with Australian Auditing Standards applicable to review engagements. A review is limited primarily to inquiries of company personnel and analytical procedures applied to the financial data. These procedures do not provide all the evidence that would be required in an audit, thus the level of assurance is less than given in an audit. We have not performed an audit and, accordingly, we do not express an audit opinion.

Statement

Based on our review, which is not an audit, we have not become aware of any matter that makes us believe that the half-year financial report of Petsec Energy Ltd is not in accordance with:

(a) the Corporations Act 2001, including:

	i.		giving a true and fair view of the consolidated entity’s financial position as at 30 June 2005 and of its performance for the half-year ended on that date; and
	ii.		complying with Australian Accounting Standard AASB 134 Interim Financial Reporting, and the Corporations Regulations 2001; and

(b) other mandatory financial reporting requirements in Australia.

KPMG

Nicola Davis Partner

Sydney, 23 August 2005

KPMG, an Australian partnership, is part of the KPMG International network. KPMG International is a Swiss cooperative.

PETSEC ENERGY LTD

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

		Petsec Energy Ltd
Date: August 23, 2005		By: /s/ Mr. Craig H. Jones
		Craig H. Jones
		General Manager — Corporate

PETSEC ENERGY LTD

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