SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a- 16 or 15d- 16

of the Securities Exchange Act of 1934

For the month of June 2018

CGG

Tour Maine Montparnasse - 33 Avenue du Maine – BP 191 - 75755 PARIS CEDEX 15

(address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F ☒ Form 40-F ☐

~~Sercel~~CGG ~~Extends~~Completes ~~Capability~~Mozambique ofMulti-Client ~~508XT~~Survey ~~Seismic Acquisition~~in ~~System~~Zambezi toDelta ~~Transition Zones~~

Paris, France – June 1213, 2018

CGG ~~announced today that Sercel~~ has completed ~~launched~~acquisition aof ~~transition~~15,400 ~~zone~~km2 ~~version~~ of ~~its~~3D ~~state-of-the-art~~marine ~~508XT~~ seismic ~~acquisition~~data ~~system.~~in ~~Seismic~~the ~~crews~~outer ~~will~~Zambezi ~~now~~Delta beBasin, ~~able~~west toof ~~deploy~~ the ~~508XT solution~~Beira inHigh. ~~marsh~~The ~~zones~~survey ~~and~~area ~~water~~covers ~~depths~~blocks ofZ5-C and upZ5-D toand 25surrounding mnon-held acreage.

~~Designed~~This ~~with~~is ~~reinforced hardware to withstand~~ the ~~complex~~first ~~challenges~~survey ofto ~~operating in~~be ~~shallow~~conducted ~~water~~following ~~environments,~~ the ~~new~~agreement ~~508XT~~CGG ~~transition~~signed ~~zone~~with ~~system also benefits from Sercel~~Mozambique’s ~~unique~~Instituto ~~fault-tolerant~~Nacional ~~X-Tech™~~de ~~cross-technology architecture,~~Petroleo ~~featuring~~(INP) ~~local~~in ~~storage~~2017 ~~and~~for ~~automatic~~the ~~rerouting~~acquisition toof ~~maximize~~a ~~survey~~new ~~productivity. With its 100% real~~multi-~~time~~client ~~monitoring capability it also brings users peace of mind that operations are running smoothly~~program.

~~Pascal~~The ~~Rouiller,~~fast-track ~~Sercel~~PreSTM ~~CEO,~~data ~~said:~~set ~~“By~~will ~~adapting~~be ~~our~~available ~~508XT~~in ~~technology~~Q4 ~~for~~2018 ~~transition zone environments, Sercel has made another step forward~~ in ~~our~~anticipation ~~strategy~~of toa ~~meet~~licence ~~customer~~round ~~needs~~during ~~for~~2019 aand ~~single~~final ~~seismic~~PreSDM ~~acquisition~~deliverables ~~system~~will ~~that~~be ~~can~~made available ~~operate~~ in ~~any~~Q4 ~~terrain and any configuration~~2019. ~~The~~A ~~508XT is~~JumpStart™ ~~undoubtedly~~integrated ~~the~~geoscience ~~most~~package ~~efficient~~will ~~and~~complement ~~powerful~~the ~~seismic~~survey ~~acquisition~~to ~~technology~~help ~~available~~accelerate ~~today~~industry ~~that~~understanding ~~can~~of ~~offer crews~~ the ~~guarantee~~petroleum ofsystems ~~recording~~in the ~~highest-quality seismic data, regardless of terrain conditions~~area.”

As part of CGG’s commitment to sustainability and high environmental standards, Sercel’s ~~508XT~~QuietSea™ ~~transition~~advanced ~~zone~~integrated passive acoustic monitoring system ~~for~~was ~~marsh~~deployed ~~zones and~~on ~~water~~the ~~depths~~survey vessel to ensure best-in-class monitoring of upmarine tomammals 25in mthe environmentally sensitive Mozambique Channel.

~~(image~~Sophie ~~courtesy~~Zurquiyah, CEO, CGG, said: “This advanced 3D survey is being imaged with our latest subsurface imaging technologies. Combined with our JumpStart integrated geoscience program, regional coverage from our 2017 East Africa Robertson Study, and the Robertson New Ventures Suite, it will support INP’s promotion of ~~Sercel)~~the potential in the deepwater Zambezi Delta Basin and the west flank of the Beira High. This full package will also provide interested industry companies with the information required to confidently de-risk the full Paleozoic, Mesozoic and Cenozoic series in this exciting new exploration area.”

LOGO

Map showing location of CGG’s recently completed 3D survey over the Beira High in the Zambezi Delta.

About CGG

CGG (www.cgg.com) is a fully integrated Geoscience company providing leading geological, geophysical and reservoir capabilities to its broad base of customers primarily from the global oil and gas industry. Through its three complementary businesses of Equipment, Acquisition and Geology, Geophysics & Reservoir (GGR), CGG brings value across all aspects of natural resource exploration and exploitation. CGG employs more than 5,300 people around the world, all with a Passion for Geoscience and working together to deliver the best solutions to its customers.

CGG is listed on the Euronext Paris SA (ISIN: 0013181864) and the New York Stock Exchange (in the form of American Depositary Shares. NYSE: CGG).

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Contacts

Group Communications

Christophe Barnini

Tel: + 33 1 64 47 38 11

E-Mail: : invrelparis@cgg.com

Investor Relations

Catherine Leveau

Tel: +33 1 64 47 34 89

E-mail: : invrelparis@cgg.com

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THIS FORM 6-K REPORT IS HEREBY INCORPORATED BY REFERENCE INTO CGG’S REGISTRATION STATEMENT ON FORM S-8 (REGISTRATION STATEMENT NO. 333-150384, NO. 333-158684, NO. 333-166250, NO. 333-173638, NO. 333-188120 AND NO. 333-197785) AND SHALL BE A PART THEREOF FROM THE DATE ON WHICH THIS REPORT IS FURNISHED, TO THE EXTENT NOT SUPERSEDED BY DOCUMENTS OR REPORTS SUBSEQUENTLY FILED OR FURNISHED.

SIGNATURES

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

Date June 12th, 2018	By	/s/ Yves Goulard
Date June 13th, 2018	By	/s/ Yves Goulard
	~~Y. GOULARD~~	Y. GOULARD
	~~Group Treasurer, acting Chief Financial Officer~~	Group Treasurer, acting Chief Financial Officer

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