TGS Expands 3D Multi-Client Seismic Data Coverage in the Moray Firth

ASKER, NORWAY--(Marketwire - May 12, 2011) - TGS commences the second season of multi-client 3D seismic acquisition in the Moray Firth, offshore United Kingdom. The survey, MF11, will add over 2,500 km² of new 3D data to the previous project area announced last June.

The M/V Oceanic Challenger will acquire the MF11 survey. Data collection is scheduled to be complete by the end of Q3 2011. Data processing will be performed by TGS and will include time processing and depth imaging deliverables.

The survey area covers open and licensed acreage north and east of the previous project, including coverage of the Halibut Horst trend and acreage around the Kildare and Buchan Fields. Upon completion of this newest 3D multi-client project, TGS will have a total of 4,700 km² of contiguous data in the area. Data from the Moray Firth 2011 survey will be available for customers from Q2 2012. 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).