Dry exploration well on Optimus

Trondheim, 2010-05-12

Dry exploration well on Optimus

Talisman Energy Norge AS, operator of license PL332, has completed
exploration well 2/2-6 named Optimus. The well is located about 24
kilometers east of the Gyda field in the Southern North Sea.

Det norske holds 40 percent in the license, but parts of Det norske's
costs related to the well will be covered by Bayerngas according to a
previous agreement.

The target was to confirm hydrocarbons in sands of upper Jurassic age.
The well did not identify any hydrocarbons.

Partners in production lisence PL 332:
Talisman Energy Norge AS (Operator): 40 %
Det norske oljeselskap ASA: 40 %
Bayerngas Norge AS: 10 %
Norske AEDC AS: 10 %

Contacts:
Knut Evensen, VP Investor Relations, tel.: +47 950 77 622
Vidar Bergo Larsen, Sr. VP Exploration, tel.: +47 90 86 60 41

About Det norske:

Det norske oljeselskap ASA has interests in a total of 74 licenses, with
37 operatorships.

Det norske is the second-largest operating company on the Norwegian
Continental Shelf both considering number of operatotships and
exploration activity. I 2009 the company operated nine exploration
wells, and the high activity will continue in 2010. Det norske runs its
activities in a safe and responsible manner in close cooperation with
the authorities.

Det norske currently employs a staff of 180. The company`s registered
office is located in Trondheim. The company also has offices in
Oslo,Harstad, and Stavanger. Det norske is listed on the Oslo Stock
Exchange (DETNOR).