Wildcats 15/3-12 S and 15/3-12 A (Sigrun East) proved oil next to the Gudrun field in the mid-North Sea on the Norwegian Continental Shelf (NCS).
Preliminary estimates place the size of the oil discovery between 6.3 and 17 MMboe of recoverable oil. The discovery will be considered developed as a tie-in to the Gudrun field, according to the NPD’s press release.
The primary and secondary exploration targets for wildcat well 15/3-12 S were to prove petroleum in Middle and Upper Jurassic reservoir rocks (the Hugin and Draupne Formations), respectively.
This well encountered three separate oil-filled reservoir zones of 9, 4 and 9 metres in the primary target, the Hugin Formation, which are about 100 metres thick. The reservoir zones mainly have moderate reservoir quality. The oil/water contacts were not encountered.
This discovery is in line with the predictions from the company Migris who foresaw “a 93 % chance of success of proving hydrocarbons if there is a Jurassic trap and also a reservoir“.
The other wildcat, 15/3-12 A, disappointed as there were only indications of oil, in a thin, three-metre sandstone layer in the Sleipner Formation in the Middle Jurassic. The Draupne and Hugin Formations were also targeted. However, both formations were found water-bearing.
Equinor is the operator of PL 025, together with Neptune Energy, OMV and Repsol as partners.
TERJE SOLBAKK
