Claus Kampmann Elected Chairman of TGS-NOPEC.

NAERSNES, Norway -- At the June 16th TGS-NOPEC annual general meeting in Oslo, shareholders elected Claus Kampmann as the Company's new chairman of the board of directors. Mr. Kampmann was first elected to the TGS-NOPEC board in June 2002, and has served as the chairman of the board's compensation committee over the past two years. During his 29-year career with Schlumberger, Claus held a number of executive level positions including president of GECO and later Geco-Prakla, vice president of Personnel for Schlumberger Ltd, and president of Oilfield Services for Europe, Africa and CIS. He currently owns 10,000 shares of TGS-NOPEC stock.

Mr. Kampmann replaces David Worthington in the chairman's role. Mr. Worthington laid out the first TGS offshore seismic program in 1980 and joined the Company in 1981. He originally joined the TGS-NOPEC Board in 1998 and has served as chairman since June 1999. He will remain a director on the TGS-NOPEC board, and has pledged to hold his 500,000 TGS-NOPEC shares as long as he serves on the board.

Concerning his new position Claus Kampmann states: "I would like to thank the shareholders for their confidence. Succeeding Dave Worthington, one of the founders of TGS and a leader in our industry, is no small task. Dave staying active on the board will help me tremendously. Also Hank Hamilton and his management team are, in my opinion, the best in our industry and I am enthusiastic to be working with them to continue steering TGS-NOPEC on a successful path."

Former Chairman David Worthington adds, "My 35-year career with Shell, TGS and TGS-NOPEC has been extremely exciting and filled with wonderful personal acquaintances. With the advance of time and broadening of my interests, it is appropriate for the Company to inject new dynamism into its leadership of the board. I am extremely confident in our new chairman and believe he is the right person to guide our Company."

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

TGS-NOPEC is a leading global provider of multi-client geoscience data and associated products and services to the oil and gas industry. TGS-NOPEC specializes in the planning, acquisition, processing, interpretation and marketing of non-exclusive seismic surveys worldwide. A2D Technologies, a wholly owned subsidiary, pioneered the delivery of digital well log data over the Internet and currently offers a one-of-a-kind integrated solution for well log data sourcing, well log data management, and well log correlation. The TGS-NOPEC group places a strong emphasis on providing high-quality data and the highest level of service to the industry.

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. These include TGS-NOPEC's reliance on a cyclical industry and principal customers, the company's ability to continue to expand markets for licensing of data, and the company's ability to acquire and process data products at costs commensurate with profitability. Actual results may differ materially from those expected or projected. TGS-NOPEC undertakes no responsibility to update forward-looking statements.