Equinor further delineates Heisenberg discovery

Equinor Energy AS completed a second well further delineating the 2023 Norwegian North Sea Heisenberg oil and gas discovery.

The operator and license partners are studying a tieback of Heisenberg to nearby infrastructure, potentially jointly coordinated with the development of other recent discoveries in the area surrounding Troll and Gjøa production hubs.

The company drilled well 35/10-13 S, the second in production license (PL) 827SB, to a vertical depth of 1,813 subsea, with the Deepsea Atlantic rig in 365 m of water (OGJ Online, March 21, 2024). It was terminated in the Sele formation in the Eocene-Palaeocene.

Encountering a 6-m oil-filled Eocene sandstone reservoir with moderate-to-good reservoir quality in the Hordaland Group, the well confirmed the Heisenberg volume estimate of 24-56 MMboe with mean of 37 MMboe, partner DNO ASA said in a release Sept. 24. The oil-water contact was not encountered.

The Angel exploration prospect, which was the main target of the license PL827SB well, was found to be mainly water wet although the well encountered non-commercial volumes of gas, DNO said.

The well was not formation-tested, but extensive data acquisition and sampling have been carried out. It has been plugged.

Equinor is operator of the license with 51% interest. DNO Energy AS holds the remaining 49%.