Total E&P Norge encountered oil after drilling an appraisal well on the Garantiana prospect in production license 554 in the Norwegian North Sea.
Appraisal well 34/6-3 S was drilled on Garantiana and exploration well 34/6-3 A, a sidetrack well, was drilled on the Akkar prospect.
Estimates for the resourse range in PL554 are now 40-90MM boe, following both wells, said partner Det Norske.
Appraisal well 34/6-3 S and the earlier discovery well were drilled about 30km northeast of the Visund field in the northern North Sea, in 381m water depth, using the Leiv Eiriksson semisubmersible (pictured). Both wells have now been permanently plugged and abandoned.
The appraisal well's objective was to delineate the 34/6-2 S oil discovery made in the Cook formation in the Lower Jurassic in 2012.
A secondary target was to prove petroleum in the Statfjord group in the Lower Jurassic, higher up on the structure than well 34/6-2 S.
Appraisal well 34/6-3 S proved a total gross oil column of 120m in the Cook formation, said Det Norske, with good reservoir quality.
Wildcat well 34/6-3 A on Akkar was drilled to prove petroleum in Early Jurassic reservoir rocks in a separate structure right next to the 34/6-2 S discovery. The secondary exploration target was to prove petroleum in the Statfjord group in the Lower Jurassic.
The well encountered a 12m oil column in the Cook formation. The Statfjord group was dry.
The two wells were the third and fourth exploration wells in PL554, which was awarded in APA 2009. The Leiv Eiriksson will move on to drill wildcat well 35/9-12 S in PL420 in the northeastern North Sea, offshore Norway, where RWE Dea is the operator.
Total holds 40% interest in PL554, alongside partners Det norske, with 10%, Spike Exploration, 40%, and Svenska Petroleum, 20%.