Vår Energi finds more oil in Goliat ridge
Vår Energi discovered oil in the Zagato prospect north of Goliat field in the Barents Sea. With a preliminarily estimated size of 15-43 MMboe recoverable, the partners will assess the find with other discoveries and prospects in the area with a view towards potential tieback to existing field infrastructure. Zagato lies 8 km northeast of the Goliat FPSO.
The discovery brings total gross estimated recoverable resources to a high case of about 100 MMboe and helps derisk prospectivity in undrilled areas, said Torger Rød, chief operating officer, Vår Energi, in a Feb. 27 release.
Rød said the operator plans to conduct both 3D and 4D seismic on area discoveries this summer and drill two more exploration/appraisal wells beginning around the end of this year's third quarter. The next scheduled well for the COSL Prospector is 7122/7-8 (Goliat nord).
Zagato discovery details
Wildcat well 7122/8-3 S, the 11th in production license 229, was drilled by the COSL Prospector in 410 m of water to a vertical depth of 2,542 m subsea. It was terminated in the Klappmyss formation in the Lower Triassic.
The well’s primary exploration target was to prove petroleum in Middle Triassic reservoir rocks in the Kobbe formation. The secondary target was to prove petroleum in Middle-Lower Jurassic reservoir rocks in the Realgrunnen sub-group.
In the primary target, the well encountered oil columns totaling 72 m in the Kobbe formation, distributed over three reservoir zones. The reservoir quality varies from good in the upper part to moderate in the lower part. The oil-water contact was not encountered.
In the secondary target, the well encountered a 3-m oil column in the Tubåen formation, with a total thickness of 20 m and very good reservoir quality. The oil-water contact was encountered 1,427 m subsea. In addition, a 2-m oil column was proven in the Klappmyss formation in a sandstone layer with moderate reservoir quality.
The well was not formation-tested, but extensive data acquisition and sampling have been carried out. The well has been temporarily plugged.
Alex Procyk | Upstream Editor
Alex Procyk is Upstream Editor at Oil & Gas Journal. He has also served as a principal technical professional at Halliburton and as a completion engineer at ConocoPhillips. He holds a BS in chemistry (1987) from Kent State University and a PhD in chemistry (1992) from Carnegie Mellon University. He is a member of the Society of Petroleum Engineers (SPE).