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 September 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 ☐

CGG toConducts ~~Apply~~Innovative ~~for~~Rich-Azimuth ~~the~~Multi-Client Survey ~~Delisting~~NW of ~~its~~Shetland ~~American~~

~~Depositary~~Paris, ~~Shares~~France ~~from~~– ~~the~~September 17, ~~New~~2018 ~~York Stock Exchange~~

CGG has commenced acquisition of a high-density, rich-azimuth, towed-streamer multi-client survey in the UK West Shetland Basin. The 3,600 sq km survey has received strong industry support and ~~Deregistration~~been designed in collaboration with major international oil companies. It focuses on delivering high-resolution seismic data in a prospective but underexplored area north-west of the ~~Securities~~Shetland ~~and~~Isles ~~Exchange~~over the northern part of the Rona Ridge. A fast-track PreSDM data set will be available in Q1 2019.

LOGO

~~Commission~~Location map for CGG’s rich-azimuth survey north-west of the Shetland Isles.

~~Paris,~~The ~~France~~innovative –acquisition geometry is designed to image multiple targets from shallow Tertiary and Cretaceous plays to complex ~~September 11~~fractured Devono-Carboniferous reservoirs by undershooting the volcanic intrusions and shallow unconformities present in the area. Two vessels, ~~2018~~the Oceanic Vega and the Geo Caribbean, are being deployed. Each vessel operates triple sources using simultaneous source technology.

~~CGG~~The ~~S.A.~~data ~~(“CGG”)~~will ~~today~~be ~~announces~~processed ~~that~~in ~~the~~depth ~~Board~~using ofCGG’s ~~Directors has unanimously approved the voluntary delisting~~ state-of ~~its American Depositary Shares (“ADSs”) from~~ -the-art ~~New~~broadband ~~York~~imaging ~~Stock~~technology, ~~Exchange~~including ~~(“NYSE”)~~advanced ~~and~~de-blending ~~its voluntary deregistration with the United States Securities~~ and ~~Exchange~~Full-Waveform ~~Commission~~Inversion ~~(“SEC”)~~velocity modeling. ~~CGG~~The ~~believes~~final ~~that~~data ~~the~~will ~~costs~~be ~~associated with~~available ~~continuing~~in ~~the listing and registration of its ADSs exceed the benefits received by CGG, as the primary market for CGG shares is Euronext Paris~~mid-2019.

~~Accordingly~~Sophie Zurquiyah, CEO, CGG ~~intends~~said: to“This ~~file~~survey ais ~~Form~~another 25example ~~with~~of ~~the~~CGG ~~SEC~~working onclosely ~~September 21,~~with ~~2018~~clients to deliver ~~effect~~ the ~~delisting~~best ~~with~~possible ~~the~~subsurface ~~NYSE~~images in a cost-effective and ~~intends~~timely tomanner. ~~file~~Until anow, ~~Form~~oil ~~15F~~and ~~with~~ gas companies interested in the ~~SEC~~exploration onpotential ~~October 1,~~of ~~2018~~this topart ~~terminate~~of ~~its~~the ~~SEC~~West ~~reporting~~Shetland ~~obligations~~Basin ~~and~~have ~~the~~lacked ~~registration~~high-quality ofseismic ~~its~~data. ~~ADSs~~We ~~under~~expect ~~the~~our new ~~Securities~~rich-azimuth ~~Exchange~~images ~~Act~~to reveal an unprecedented level of ~~1934,~~detail asin ~~amended~~this exciting frontier area.”

The termination of the registration of its ADSs will become effective 90 days after the date of filing of the Form 15F with the SEC or such shorter period as the SEC may determine. However, as a result of the filing of a Form 15F, CGG’s obligation to file certain reports, including its obligation to file annual reports on Form 20-F and to furnish reports on Form 6-K with the SEC will be immediately suspended.

Following delisting of the ADSs from the NYSE, CGG intends to maintain its American Depositary Receipt program at “level one”. This will enable investors to retain their ADSs and facilitate trading on the U.S. over-the-counter market. The depositary of CGG’s ADR program will remain The Bank of New York Mellon.

Following deregistration and delisting, CGG will continue to publish its financial reports, statements and press releases in English.

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

LOGO

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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 September 11th, 2018 By /s/ Yuri Baidoukov Chief Financial Officer


Date September 17^th, 2018	By	/s/ Yuri Baidoukov
		Chief Financial Officer

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