TGS-NOPEC (OSL:TGS) Asker, Norway, (7 October 2008) - TGS-NOPEC Geophysical Company (TGS) today announced that it has commenced the acquisition of approximately 9,000 square kilometers of multi-client 3D seismic data located offshore Liberia. Additional planned phases could increase the size of the program significantly by the end of 2009. This substantial program covers a number of blocks recently awarded by the National Oil Company of Liberia ("NOCAL") and has achieved a high level of pre-funding. The first phase of acquisition commenced in September. A second vessel will be added in November for the second phase and will continue through most of 2009.

TGS first acquired regional multi-client 2D data in Liberia in 2001. Since that time Liberia has held a number of successful bid rounds. Companies now operating or sharing in offshore contracts in Liberia now include Anadarko Liberia Company, Woodside Petroleum, Repsol, Oranto, Broadway Consolidated and European Hydrocarbons.

"It has been exciting to participate in the growth of Liberia's offshore oil and gas exploration industry. TGS' ongoing multi-client data investments in Liberia reflect our confidence in Liberia's offshore potential as well as our commitment to further our relationship with NOCAL" said David Hicks, VP AMEAP.

The Liberia data will processed in TGS centers in London and in Houston. The first data deliveries are expected to be in Q2 of 2009. 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 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:

Arne Helland Chief Financial Officer Tel: +47 66 76 99 31/+47 91 88 78 29 Email: arne.helland@tgsnopec.no

Karen El-Tawil VP, Business Development Tel: +1 713 860 2100 Email: karen.el-tawil@tgsnopec.com

TGS-NOPEC

http://www.tgsnopec.no/

ISIN: NO0003078800

Stock Identifier: XOSL.TGS

US: Other OTC: TGSNF.PK

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