TGS Announces a New 3D Multi-Client Survey in the North Viking Graben

ASKER, NORWAY--(Marketwire - August 26, 2009) - TGS announces the third 3D Multi-Client survey acquired and marketed in partnership with PGS in 2009, called the NVG09 3D survey.

This new project covers a 640 square kilometer area in the North Viking Graben area and the majority of the survey lies in Norwegian waters. The dataset is acquired by the PGS Atlantic Explorer and utilizes the PGS Geostreamer Technology.

The NVG09 3D survey is supported by client funding and the processed data will be completed and delivered in mid February 2010.

TGS-NOPEC Geophysical Company (TGS) is a principal resource for global geoscientific data products and services in the E&P industry. TGS specializes in the design, acquisition and processing of multi-client seismic surveys worldwide and delivers advanced high performance seismic imaging and software solutions. The Company also provides the world's largest online well-log database, well data management services, multi-client interpretive products and subsurface consulting services to industry. The suite of integrated exploration data products available from TGS is distinctive and unmatched. The Company philosophy is to create unique high-quality data collected in the right place at the right time.

The information included herein contains certain forward-looking statements that address activities, events or developments that the Company expects, projects, believes or anticipates will or may occur in the future. These statements are based on various assumptions made by the Company, which are beyond its control and are subject to certain additional risks and uncertainties as disclosed by the Company in its Annual Report. As a result of these factors, actual events may differ materially from those indicated in or implied by such forward-looking statements.

TGS-NOPEC Geophysical Company ASA is listed on the Oslo Stock Exchange (OSLO: TGS).

Visit TGS-NOPEC Geophysical Company online at www.tgsnopec.com

Contact Information: For more information, contact: Kjell Trommestad VP and General Director EU/RU Tel: +47 66 76 99 61 Email: Arne Helland Chief Financial Officer Tel: +47 66 76 99 31/+47 91 88 78 29 Email: