Oil discovery at Trell

Det norske oljeselskap ASA is, as partner in production licence 102F, in the process of completing the drilling of exploration well 25/5-9. The well encountered a gross oil column of 21 metres in the Heimdal formation, of which 19 metres had good reservoir quality. Basic data acquisition and sampling were carried out. The acquired information and pressure data indicate, as expected, very good production properties.

The exploration target for well 25/5-9 was to prove petroleum in Paleocene reservoir rocks (the Heimdal formation). The well encountered a gross oil column of 21 metres in the Heimdal formation, of which 19 metres had good reservoir quality. The oil/water contact was encountered.

Preliminary estimates place the size of the discovery between 0.5 and 2.0 million standard cubic metres (Sm3) of recoverable oil. The licensees will evaluate the discovery together with other nearby prospects and consider further follow-up.

The well was drilled about 10 kilometres east of the Heimdal field in the central part of the North Sea, and about 200 kilometres northwest of Stavanger.

The well was the first in production licence 102F. The well was drilled vertically to 2240 metres below sea level and terminated in the Heimdal formation in the Paleocene. The water depth at the site is 122 metres. The well will be permanently plugged and abandoned.

The licensees are TOTAL E&P NORGE AS (operator, 40 percent), Petoro AS (30 percent), Det norske oljeselskap ASA (10 percent), Lotos Exploration and Production Norge AS (10 percent), Ithaca Petroleum Norge AS 10 (percent).

Contact:

Knut Evensen, VP Investor Relations, tel.: + 47 950 77 622.

About Det norske:
Det norske oljeselskap ASA (DETNOR) is an active exploration company on the Norwegian Continental Shelf. Det norske’s headquarters is in Trondheim. The company also has offices in Oslo and Harstad. Det norske is listed on the Oslo Stock Exchange with the ticker "DETNOR".

More about Det norske at www.detnor.no/en