Purchase of own shares

TGS-NOPEC Geophysical Company ASA (TGS) purchased 5
000 own shares on 17 December 2013. The shares were
purchased at an average price of NOK 141,9898 per
share. This repurchase of shares is conducted in
accordance with the rules and regulations of the Oslo
Stock Exchange for time-scheduled repurchases of
shares (cfr Børssirkulære 2/2008) and the proxy given
by its shareholders at the Ordinary General Meeting
held on 4 June 2013. The repurchase of up to USD 5
million of TGS shares will be conducted up to 31
December 2013 at the latest.

After the transaction TGS holds 1 416 200 own shares,
representing 1,37% of the outstanding number of
shares.

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

For additional information about this press release
please contact:

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

Will Ashby
Director Investor Relations and M&A
Tel: +1 713 860 2184
Email: will.ashby@tgs.com