HOUSTON (17 April 2012) -TGS has commenced acquisition of the Wellington multi-
client 3D onshore survey in the United States.  The project covers 161 mi(2)
(416 km(2)) 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).

For additional information about this press release please contact:

Kristian Johansen
Chief Financial Officer
Office: +47 667 69931
Cell: +47 47 60 33 34
Email: kristian.johansen@tgs.com

Karen El-Tawil
VP, Business Development
Office: +1 713 860 2102
Cell: +1 713 806 2420
Email: karen.el-tawil@tgs.com

Rod Starr
Senior VP, Western Hemisphere
Office: +1 713 860 2152
Email: rod.starr@tgs.com

This information is subject of the disclosure requirements acc. to §5-12 vphl
(Norwegian Securities Trading Act)



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