Date: 31/5 2002

TGS-NOPEC Begins New Non-Exclusive Seismic Program Offshore NW Africa

Houston, Texas, May 30, 2002 -- TGS-NOPEC Geophysical Company today announced the commencement of a new non-exclusive 2D seismic program located offshore NW Africa.  The Company's vessel Northern Access is acquiring this state-of-the-art 15,000-kilometer geophysical survey. TGS-NOPEC has secured significant pre-funding from the oil industry in support of the project.
 
TGS-NOPEC is a leading global provider of non-exclusive seismic data and associated products to the oil and gas industry.  TGS-NOPEC specializes in the planning, acquisition, processing, interpretation and marketing of non-exclusive surveys worldwide.  The company places a strong emphasis on providing high-quality seismic data and the highest level of service to the industry.  TGS-NOPEC also offers proprietary seismic acquisition and processing services, as well as gravity and aeromagnetic surveys.
 
TGS-NOPEC is listed on the Oslo Stock Exchange (OSLO:TGS).
 
For additional information about this new release contact:
 
Pierre Benichou
Houston
713-860-2105
 

Richard Horscroft
Houston
713-860-2111
 

Melissa Stowe
Houston
713-860-2164
 

Stein Ove Isaksen
Nærsnes, Norway
+47-31 29 20 00