TGS Commences 2D Multi-Client Seismic Survey Offshore Sierra Leone

TGS Commences 2D Multi-Client Seismic Survey Offshore Sierra Leone 
ASKER, NORWAY -- (Marketwire) -- 03/19/13 --  TGS has commenced
acquisition of a 2D multi-client survey offshore Sierra Leone. The
survey, SL13, will add 9,191 km of new 2D data to infill the existing
5,784 km of 2D data acquired in 2001. Upon completion of the SL13
survey, TGS will have approximately 15,000 km of contiguous 2D
multi-client data and 6,268 km2 of 3D data offshore Sierra Leone.  
The seismic data is being acquired by the M/V Geo Arctic. Data
processing will be performed by TGS and will be available to clients
in Q4 2013.  
The survey is supported by industry funding. 
Company summary  
TGS-NOPEC Geophysical Company (TGS) provides multi-client geoscience
data to oil and gas Exploration and Production companies worldwide.
In addition to extensive global geophysical and geological data
libraries that include multi-client seismic data, magnetic and
gravity data, digital well logs, production data and directional
surveys, TGS also offers advanced processing and imaging services,
interpretation products, permanent reservoir monitoring and data
integration solutions. 
For more information visit TGS online at 
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
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
Tel: +47 47 60 33 34
Will Ashby 
Director Investor Relations and M&A
Tel: +1 713 860 2184
Stein Ove Isaksen
Senior VP Eastern Hemisphere
Tel: +47 66 76 99 00
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