TGS Commences Second Onshore Multi-Client 3D Seismic Survey in Kansas

HOUSTON, TX--(Marketwire - Apr 17, 2012) - TGS has commenced acquisition of the Wellington multi-client 3D onshore survey in the United States. The project covers 161 mi² (416 km²) and is located in Sumner County in Kansas.

The Wellington seismic program is designed to illuminate the Mississippi Lime Play in southern Kansas. This survey complements the previously announced Bucklin survey and both were designed to provide valuable information needed to enhance the exploration and development of the oil rich Mississippi Lime Play. The Wellington survey is being acquired utilizing a high channel count vibroseis crew. Final deliverable products will be processed through pre-stack time migration.

Data will be available to clients Q4 2012. The survey is supported by industry funding.

Company summary

TGS-NOPEC Geophysical Company (TGS) provides multi-client geoscience data and services to oil and gas Exploration and Production companies around the globe. TGS' geophysical and geological data products include multi-client seismic libraries, permanent reservoir monitoring, magnetic and gravity data, the industry's largest global database of digital well logs and regional interpretive products. TGS also provides high-end depth imaging services to help resolve complex seismic imaging problems. 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).