Acquisition to Greatly Enhance TGS Seismic Processing Capability Houston, Texas (2 April 2007) - TGS-NOPEC Geophysical Company L.P., a subsidiary of TGS-NOPEC Geophysical Company ASA ("TGS"), and Parallel Data Systems, Inc. ("PDS") announced today that they entered into a definitive agreement on March 31, 2007 whereby TGS will acquire all shares of PDS. The transaction has been approved by the Board of Directors of both companies and is subject to U.S. regulatory approval. PDS is a high-tech seismic imaging specialist with 21 employees and offices in Houston and Dallas. Founded in 1997, PDS has developed a number of unique proprietary software applications designed to accurately and efficiently process seismic data in both the time and depth domains. Hank Hamilton, Chief Executive Officer of TGS, views the PDS acquisition as major step forward in the growth of the company's core business. "We are determined to develop a world-class seismic imaging organization to satisfy the growing demands of our customer base and to build our data library with leading edge technologies. In working with PDS on a number of recent projects, we have been extraordinarily impressed with their ability to solve highly complex imaging problems on massive datasets while meeting very challenging project schedules. The combination of PDS with our existing TGS Imaging group will dramatically increase our throughput capacity and our array of imaging algorithms, as well as provide the critical mass in research and development necessary to commercialize the next generation of seismic imaging technologies including wide azimuth 3D." For more information, please see notice filed at the Oslo Stock Exchange. TGS is a leading global provider of multi-client geoscientific data, associated products and services to the oil and gas industry. TGS specializes in the creation of non-exclusive seismic surveys worldwide. The Company provides advanced depth imaging solutions and software through its TGS Imaging division. Well log data is available for conversion, sourcing, management and immediate delivery through TGS subsidiary, A2D Technologies. Multi-client interpretive products and subsurface consulting services are provided through the Company's Aceca subsidiary. The TGS family of companies 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 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). For more information about this news release, please contact: John Adamick VP, Business Development Tel: +1 713 860-2100 Email: [email protected] Arne Helland Chief Financial Officer Tel: +47 66 76 99 00/+47 91 88 78 29 Email: [email protected] --- End of Message --- TGS-NOPEC Baardsrudveien 2 Nærsnes Norway ISIN: NO0003078800; ;