TGS Announces 3D Multi-Client Onshore Survey in South Central Alberta, Canada

August 22, 2013

CALGARY, CANADA--(Marketwired - Aug 22, 2013) - TGS, through its wholly-owned subsidiary Arcis Seismic Solutions, announces a new 3D multi-client onshore survey, Three Hills East, covering 150 km2 (58 mi2) in the south central plains of Alberta, Canada.

The Three Hills East survey is designed to evaluate multiple zones from the Devonian (Nisku), the Mississippian (Banff and Pekisko), and the Cretaceous (Ellerslie and Ostracod) in the newly emerging Duvernay play. The survey's optimal acquisition parameters, enhanced imaging and rock property assessments will provide even greater assistance with the placement of horizontal wells in this highly prospective area.

Permitting is underway and data acquisition is expected to commence in September 2013. The seismic data will be processed by Arcis and final data will be available to clients Q4 2013.

The survey is supported by industry funding.

Company summary

TGS-NOPEC Geophysical Company (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, permanent reservoir monitoring and data integration solutions.

For more information visit TGS online at www.tgs.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 ).

TGS sponsored American Depositary Shares trade on the U.S. over-the-counter market under the symbol "TGSGY".