TGS Announces New Multi-client 2D Seismic Survey in Namibia

HOUSTON (19 September 2011) - TGS has commenced a new 15,000 km multi-client 2D
seismic survey offshore Namibia.

TGS considers this region to have significant exploration potential and is
pleased to acquire new data that both complements and extends TGS´ existing
seismic coverage in the area.  The survey grid covers open acreage and images
the main prospective plays due for drilling in 2011/2012.

Offshore Namibia is significantly underexplored and has the potential to hold
large oil and gas discoveries.  The positive mix of play types in the TGS survey
area include basin floor turbidites, slope fans and channels, significant syn-
rift structures and plays similar to those offshore Angola.  Recent studies have
also shown additional strong hydrocarbon indicators in significant structures.

The seismic data is being acquired by the M/V Northern Explorer.  Data
processing will be performed by TGS and data will be available to clients Q1
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.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).

For additional information about this press release please contact:

Kristian Johansen
Chief Financial Officer
Office: [phone]
Cell: [phone]
Email:[e-mail]

Karen El-Tawil
VP, Business Development
Office: [phone]
Cell: [phone]
Email:[e-mail]

Rod Starr
Senior VP Africa, Middle East and Asia Pacific
Office: [phone]
Email:[e-mail]
This information is subject of the disclosure requirements acc. to §5-12 vphl
(Norwegian Securities Trading Act)

This announcement is distributed by Thomson Reuters on behalf of
Thomson Reuters clients. The owner of this announcement warrants that:
(i) the releases contained herein are protected by copyright and
other applicable laws; and
(ii) they are solely responsible for the content, accuracy and
originality of the information contained therein.

Source: TGS via Thomson Reuters ONE

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