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

ASKER, NORWAY--(Marketwire - Jun 8, 2011) - TGS has commenced the acquisition of a fourth 3D multi-client survey in partnership with PGS.

The survey covers 2,772 km² in the North Viking Graben over an area which has proven to be a very successful petroleum province of the North Sea.

The data is being acquired by PGS' Atlantic Explorer utilizing GeoStreamer technology. This year's acquisition campaign, combined with the data acquired in 2009-2010, will total over 7,500 km² of 3D data in this promising region.

The survey is supported by industry funding.

Company summary

TGS-NOPEC Geophysical Company (TGS) provides global geoscience data products and services to the oil and gas industry for the exploration and delineation of hydrocarbon reserves. We design and acquire multi-client data projects worldwide that make up our data library of seismic, gravity/magnetic and well data, enhanced by our seismic imaging technology and regional interpretation expertise. Visit TGS online at www.tgsnopec.com.

Forward-looking statements and contact information

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).