An exploration well and a sidetrack currently being completed by Statoil (NYSE:STO) near Gullfaks South have yielded the third discovery made in the Gullfaks licence so far this year.
Situated in waters measuring 136 meters deep, the Deepsea Atlantic ultra-deepwater semisub drilled exploration well 34/10-52 A to a total vertical depth of 3,440 meters, terminating the well in the Middle Jurassic Drake formation. The 34/10-52 B sidetrack was drilled to a vertical depth of 3,580 metres beneath the sea surface to terminate in the Drake formation.
“This confirms yet again that infrastructure-led exploration is important and yields highly commercial finds which can be brought on stream quickly,” says Tom Dreyer, Statoil exploration head for the northern North Sea.
“We regard the area around Gullfaks South as prospective and the find confirms our faith in the area. Even though the volumes are modest compared with the large finds made off Norway earlier, this type of discovery is important for maximizing the potential on the Norwegian continental shelf, and contributes to extending the production life of installations.”
The wells were intended to prove petroleum in Middle Jurassic reservoir rocks of the Brent group, and whether communication exists with the producing structures in Gullfaks South.
Oil- and gas-bearing intervals were observed in the upper part of the Brent group along both well paths, and a column about 120 metres thick with good reservoir quality was proven.
No hydrocarbons were found in the lower Brent group. The wells have not been formation tested, but data were collected and cores taken to determine the hydrocarbon system and contacts.
Preliminary calculations indicate that 3 to 9.5 million barrels of recoverable oil equivalent are present, which are planned to be tied back to existing infrastructure in the Gullfaks area.
The two other discoveries made so far this year in the Gullfaks licence are Rutil and Opal.
Statoil serves as operator of PL 050 with 70 percent interest, and Petoro holds the remaining 30 percent interest.
Statoil discovers oil, gas in Gullfaks license