TGS-NOPEC announces new 2D seismic survey in Celtic Sea offshore Ireland

20 October 2005

Naersnes, Norway and Houston, Texas (20 October, 2005) - TGS-NOPEC Geophysical Company (TGS) has commenced acquisition of a new multi-client 2D survey offshore Ireland. The 1,500 kilometer survey is located in the Saint George's Channel Basin and is designed to better resolve the Pegasus and Dragon structural trends in the area. Acquisition is being conducted in partnership with Fugro-Geoteam utilizing the M/V Northern Explorer with a streamer length of 8,000 meters. The well prefunded survey is being processed by TGS Imaging and is scheduled to be available during the first quarter of 2006.

New 2D Seismic Survey in Celtic Sea Offshore Ireland



TGS-NOPEC Geophysical Company (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 also provides advanced depth imaging solutions and software through its TGS Imaging division. A2D Technologies, a wholly-owned subsidiary, is the energy industry's well log data marketplace offering the largest online database, immediate delivery, conversion services, data management services and worldwide well log data sourcing. 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).


John Adamick
Senior VP, Geological Products and Services
Tel: +1 713 860 2100