TGS Nopec Geophys. : Delivers New Higher Order Depth Imaging Projects in the Gulf of Mexico.

Houston, Texas, Asker, Norway (January, 22,  2009) - TGS-NOPEC
Geophysical Company (TGS) announced today that it has completed
several new multi-client higher order depth imaging projects that
will be used to evaluate hydrocarbon potential in areas of the
Central Gulf of Mexico prior to the Lease Sale in March 2009.

TGS has created the industry's first multi-client Reverse Time
Migration (RTM) product on the Stanley 3D survey.   This migration
covers an 8,900 square kilometer area (~385 OCS blocks) in the Green
Canyon and Walker Ridge area of the deep water Gulf of Mexico that
includes OCS blocks that received some of the highest bonus bids in
recent years. The RTM algorithm shows improved imaging in the subsalt
areas of this very structurally complex area. Final results of the
project have been delivered to the early participating customers.

In addition, TGS has completed an anisotropic Kirchhoff depth
migration on its Eastern Mississippi Canyon, Deep Resolve and
Sophie's Link 3D surveys.  Anisotropic migration uses well data to
calibrate the seismic to the true earth which provides better
positioning and more accurate imaging of the subsurface.   These new
imaging products tie to the existing anisotropic migration that was
previously completed in the Mississippi Canyon area.  Upon completion
of these migrations, TGS now offers 32,000 sq kilometers (~1476 OCS
blocks) of contiguous and seamless anisotropic depth migration in the
Central Gulf of Mexico.  Said projects incorporated over 800 well
logs in building the anisotropic model.

 "The industry has embraced the proprietary imaging technology that
TGS has developed", said Robert Hobbs, COO of TGS.  "The demand from
our customers to use these algorithms to enhance our data library has
been strong and has allowed us to expand on the success that we had
in Mississippi Canyon.

The RTM and Anisotropic Kirchhoff depth migration algorithms used in
these projects are proprietary to TGS.
All of the projects mentioned were underwritten by oil companies.

 TGS-NOPEC Geophysical Company (TGS) is a principal resource for
global geoscientific data products and services in the E&P industry.
TGS specializes in the design, acquisition and processing of
multi-client seismic surveys worldwide and delivers advanced high
performance seismic imaging and software solutions. The Company also
provides the world's largest online well-log database, well data
management services, multi-client interpretive products and
subsurface consulting services to industry. The suite of integrated
exploration data products available from TGS is distinctive and
unmatched. The Company philosophy is to create unique high-quality
data collected in the right place at the right time.

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 news release please contact:

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

Arne Helland
Chief Financial Officer
Tel: [phone]
Email: [e-mail]


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