/C O R R E C T I O N -- Geophysique/ In the news release, "Compagnie Generale de Geophysique (CGG): 2nd Quarter 2004 Results - Thursday September 2nd 2004" issued on 20 Aug 2004 04:17 EST, by Geophysique (NYSE: GGY) over PR Newswire, we are advised by a representative of the company that in the second paragraph (first bullet point), it should read "Robert BRUNCK, Chairman and CEO, will comment on the results during a meeting..." and not "the shareholders meeting" as originally issued inadvertently. Complete, corrected release follows: MASSY, France, August 20 /PRNewswire-FirstCall/ -- CGG (ISIN: 0000120164 - NYSE: GGY) will release its Q2 2004 financial results on Thursday September 2nd 2004, before the opening of the Paris and New York stock exchanges. -- Robert BRUNCK, Chairman and CEO, will comment on the results during a meeting at 10.00 am - 10, avenue d'Iena (Hubert Roussellier Amphitheatre) - Paris 16th arrondissement. -- Copies of his presentation for this conference will be posted on the company web site and can be downloaded. -- a press release will be available on our website : http://www.cgg.com/ at 8 a.m. on this date. -- an English language conference call is scheduled at 4.00 p.m. (Paris time) - 9.00 am (US CT) - 10.00 am (US ET). To take part in the English language conference, simply dial five to ten minutes prior to the scheduled start time. - International call-in 1 719 457 2679 - US call-in (800) 500 01 77 - Replay (719) 457 0820 & (888) 203 1112 You will be asked for the title of the conference: "CGG Q2 & Half-Year 2004 Results" and the name of the Chairman of the Board of Directors: "Robert Brunck". This conference will be broadcast live on CGG's website and replays will be available for a week thereafter. The Compagnie Generale de Geophysique group is a global participant in the oilfield services industry, providing a wide range of seismic data acquisition, processing and geoscience services and software to clients in the oil and gas exploration and production business. It is also a global manufacturer of geophysical equipment. Contacts: Christophe BARNINI, +(33)-1-64-47-38-10 PRNewswire -- August 20 DATASOURCE: Geophysique

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