TGS Expands 3D Survey in DeSoto Canyon Through Cooperation Agreement

TGS-NOPEC Geophysical Company ASA (TGS) announced today the formation of a cooperation agreement with Petroleum Geo-Services ASA (PGS) to combine the previously announced and ongoing TGS Hernando 3D survey and the PGS Discovery DeSoto Canyon MC3D survey into one large, seamless, 3D multi-client project in the DeSoto Canyon in the Central and Eastern Gulf of Mexico Planning areas.

This joint survey, named Hernando, will cover a 365 OCS block area (8,500 square kilometers). More than 225 equivalent blocks have already been recorded by the two companies using one 3D vessel each and a subset of this data is currently available as a fast-track product for use in the March 2009 OCS Lease Sale.

“This joint survey offered by TGS and PGS, and funded by oil companies, allows the application of leading-edge technology from both companies to provide the best image of complex geology in an area of significant interest to our customers in the Gulf of Mexico,” said Robert Hobbs, COO of TGS.

Final data from the full survey is expected to be available to clients by the end of 2009.

TGS-NOPEC Geophysical Company (TGS) is a principal resource for global geoscientific data products and services in the E&P industry. TGS specializes in the design, acquisition and processing of multi-client seismic surveys worldwide and delivers advanced high performance seismic imaging and software solutions. The Company also provides the world’s largest online well-log database, well data management services, multi-client interpretive products and subsurface consulting services to industry. The suite of integrated exploration data products available from TGS is distinctive and unmatched. The Company philosophy is to create unique high-quality data collected in the right place at the right time.

All statements in this press release other than statements of historical fact are forward-looking statements, which are subject to a number of risks, uncertainties and assumptions that are difficult to predict, and are based upon assumptions as to future events that may not prove accurate. These factors include TGS' reliance on a cyclical industry and principal customers, TGS’ ability to continue to expand markets for licensing of data, and TGS’ ability to acquire and process data products at costs commensurate with profitability. Actual results may differ materially from those expected or projected in the forward-looking statements. TGS undertakes no responsibility or obligation to update or alter forward-looking statements for any reason.

TGS-NOPEC Geophysical Company ASA is listed on the Oslo Stock Exchange (OSLO:TGS).

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