Press Releases

TGS commences 8th season of long offset acquisition in cooperation with Fugro

ASKER, NORWAY (14 June 2010) - TGS announced another season of acquisition of long offset data on the Norwegian Continental Shelf (NCS) in cooperation with Fugro. The data to be collected (shown on the attached map) include approximately 15,000 km for the North Sea Renaissance (NSR) survey in Holland, Norway and UK, approximately 10,000 km for the Mid-Norway Regional (MNR) survey in the Norwegian Sea and approximately 15,000 km for the Norwegian Barents Sea Regional (NBR) survey in the Barents Sea.

TGS will dedicate two vessels, Bergen Surveyor and Northern Genesis, during the summer season to acquire the NSR project. The data acquired by these vessels will be processed at TGS' imaging center in Bedford, England. Fugro will also contribute two vessels, Geo Arctic and Akademik Lazarev, to acquire the MNR and NBR data, respectively. Fugro will process the data acquired on those two projects.

With the 2010 acquisition program, TGS' total long offset grid on the Norwegian Continental Shelf (NCS) increases to approximately 260,000 km, constituting the most important 2D seismic dataset for the oil industry in the NCS. Data from the three surveys will be available for customers from Q4-2010.

NSR-MNR-NBR-June14

About TGS

TGS provides multi-client geoscience data to oil and gas Exploration and Production companies worldwide. In addition to extensive global geophysical and geological data libraries that include multi-client seismic data, magnetic and gravity data, digital well logs, production data and directional surveys, TGS also offers advanced processing and imaging services, interpretation products, and data integration solutions.

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 product 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.

Sven Børre Larsen

Sven Børre Larsen

Chief Financial Officer

Tel: +47 90 94 36 73

Ellen Munkvold

Ellen Munkvold

IR Coordinator

Tel: +47 97 76 26 25