Wintershall Norge said Thursday that it has made an oil discovery near the Vega field in the Norwegian North Sea.
According to the Norwegian Petroleum Directorate (NPD), Wintershall is in the process of completing four wells in its operated production licence 248 F.
The wells were drilled about 16 feet southeast of the Vega field in the North Sea and about 203 miles southwest of Florø.
The wells are wildcat well 35/11-20 S, appraisal well 35/11-20 A and wildcat well 35/11-20 B.
A fourth well, well 35/11-19 S, had to be abandoned due to technical issues, according to the NPD.
The NPD said well 35/11-20 S did not encounter reservoir rocks in its primary target in Late Jurassic reservoir rocks but it did encounter an 26 foot oil column in the secondary exploration target at the top of an intra Heather formation sandstone.
The column had “poor reservoir quality” and a total thickness of about 229 feet.
The objective of well 35/11-20 A was to delineate the oil discovery in intra Heather formation sandstone and to prove petroleum in Middle Jurassic (Brent group) and Early Jurassic (Cook formation) reservoir rocks.
The well encountered a total oil column of 108 feet in intra Heather formation sandstone, with 62 feet being of good reservoir quality.
Due to technical issues, it was not possible to reach the Brent group and Cook formation, the NPD said.
Well 35/11-20 B was drilled to further delineate the oil discovery in intra Heather formation sandstone.
The well’s secondary target was to prove petroleum in Middle Jurassic (Brent group) and Early Jurassic (Cook formation) reservoir rocks.
The well encountered a total oil column of 150 feet in intra Heather formation sandstone, with 95 feet being of moderate reservoir quality.
The well also encountered a total oil column of 62 feet was encountered in the Tarbert formation in the Brent group, with 32 feet being of moderate reservoir quality.
Well 35/11-20 B encountered the Cook formation with a total thickness of about 557 feet with “predominantly poor reservoir quality and only traces of petroleum,” the company said.
The NPD said preliminary estimates place the size of the discovery between 1.5 and 4.5 million standard cubic meters of recoverable oil equivalents.
“The licensees will evaluate the discovery along with other nearby discoveries with a view toward a potential development,” the agency said.
The wells have not been formation-tested, but Wintershall collected extensive data and samples.
The wells are the second, third, fourth and fifth exploration wells in production licence 248 F.
Well 35/11-20 S was drilled to a measured depth of about 11,656 feet and well 35/11-20 A was drilled to a measured depth of 12,936 feet below the sea surface.
Both wells were terminated in the Heather formation in the Middle Jurassic.
Well 35/11-20 B was drilled to a measured depth of 16,676 feet and was terminated in the Statfjord group in the Early Jurassic.
Water depth at the site is 1,223 feet.
The wells will now be permanently plugged and abandoned.
Wells 35/11-19 S, 35/11-20 S, 35/11-20 A and 35/11-20 B were drilled by the Borgland Dolphin drilling facility.
Well 35/11-20 A was classified as a wildcat well, but will now be reclassified as an appraisal well.
The wells were drilled about three miles southeast of the Vega field in the North Sea and 62 miles southwest of Florø.