TGS Acquires Exclusive Sales Rights to Reprocessed Seismic

DataTGS Exclusive Tokking Surveys, Coverage of 2D Programs Norwegian Sea 
(Graphic: Business Wire)TGS Exclusive Tokking  Surveys, 2D Programs Norwegian 
Barents Sea (Graphic: Business Wire) 
OSLO, Norway--(BUSINESS WIRE)--Dec. 6, 2005
TGS-NOPEC Geophysical Company ASA (TGS) announced today
that it has concluded an agreement with Tokking Surveys AS for the
exclusive sales rights to approximately 131,000 kilometers of
reprocessed 2D seismic in the Norwegian Sea and Barents Sea, offshore
Norway. The surveys consist of reprocessed data vintages ranging from
1997 to 2005, and are complementary to TGS's existing data library in
Norway. These data, including a detailed interpretation, offers a cost
effective and quick start to exploration of the Norwegian and the
Barents Sea for newcomers in particular. TGS paid NOK 11,0 million for
the rights. As TGS and Tokking Surveys have collaborated on a number
of reprocessing projects since 2000, TGS already had an approximate
45% interest in 70,000 kilometers of the Tokking marketed surveys
prior to this transaction. 
See map of Norwegian Sea data coverage: 
See map of Norwegian Barents Sea data coverage: 
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
TGS-NOPEC Geophysical Company ASA is listed on the Oslo Stock
Exchange (OSLO:TGS). 
TGS-NOPEC Geophysical 
John Adamick, 713-860-2100
Arne Helland, +47 31 29 20 33
Kjell E. Trommestad, +47 31 29 20 06
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