The preliminary estimated size of the discoveries in well 31/4-A-15 B is 0.3-1.11 million  standard cubic metres of oil equivalent (2-7 million barrels) in the Cook Formation and 2.2-4.1 million standard cubic metres of oil equivalent (14-26 million barrels) in the Statfjord group in theTalisker area.

The well was drilled from Brage, and the licensees in production licence 055 are considering tying the discovery back to the Brage field. 

Geological information

The objective of the well was to prove petroleum in Lower Jurassic reservoir rocks in the Cook Formation and the Statfjord group.

Wellbore 31/4-A-15 B encountered 25 metres of oil in the Cook Formation, in sandstone layers totalling 52,4 metres, with moderate reservoir properties. The oil/water contact was not encountered. 

In the Statfjord group, the wellbore  encountered 63 metres of oil in a total of 171 metres of sandstone with moderate to good reservoir properties. The oil/water contact was encountered at 2616 metres below the sea level.

The well was not formation-tested, but data collection and sampling have been carried out.

The wellbore was drilled to respective measured and vertical depths of 10,223 metres and 2759 metres below the sea level. It was terminated in the Lunde Formation in the Upper Triassic. 

The wellbore has been permanently plugged and abandoned.