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Image courtesy of Harald Pettersen/ Statoil.

Norway’s Statoil said Wednesday that it found gas and oil pay zones at its wildcat well 15/6-13 and appraisal wells 15/6-13 A and 15/6-13 B in the North Sea.

The wells were drilled about 155 miles west of Stavanger and directly northeast of the Statoil operated Gina Krog field in water depths of 374 feet, the Norwegian Petroleum Directorate said.

The objective of well 15/6-13 was to prove commercial petroleum volumes in Middle Jurassic reservoir rocks, in the Hugin formation, and to acquire sufficient data to avoid further delineation, investigate the size of the discovery, the properties and continuity of the reservoir rocks and to  determine the petroleum properties.

The objective of sidetracks 15/6-13 A and 15/6-13 B was to delineate the discovery and investigate the likelihood of deeper oil and shallower gas on the structure.

15/6-13 encountered two separate oil columns measuring 42 feet and 9.8 feet of sandstone with “moderate to good reservoir properties” in the Hugin formation and upper part of the Sleipner formation.

The oil/water contact was not encountered.

15/6-13 A encountered 22.9 feet and 29.5 feet of sandstone with moderate reservoir quality in the Hugin and Sleipner formations, both aquiferous.

The aquiferous sandstone in the Hugin formation is thought to be in pressure communication with the oil zone in 15/6-13, the NPD said.

15/6-13 B showed an overall gas column of about 196 feet, with 22.9 feet of sandstone with “moderate” reservoir quality in the Hugin formation and about 85 feet of sandstone with “moderate” reservoir properties in the Sleipner formation.

The NPD added that the underlying sandstone in the Skagerrak formation is tight and aquiferous.

For the discovery as a whole, the overall oil and gas column totals about 984 feet, with each column measuring about 492 feet.

Preliminary calculations place the size of the discovery between one and two million standard cubic meters of recoverable oil equivalents in the Hugin formation.

Calculations of any additional volumes from the Sleipner formation will require additional assessment for further clarification, the NPD said.

None of the wells were formation-tested, but comprehensive data collection and sampling was conducted.

“The licensees in the Gina Krog Unit will assess the discovery further with a view toward possible development and tieback to the Gina Krog field,” the NPD said.

Wells 15/6-13 was drilled to a measure depth of 11,735 feet and a vertical depth of 11,653 feet feet below the sea surface and well 15/6-13 A was drilled to a measure depth of 12,877 feet and a vertical depth of 12,191 feet feet below the sea surface.

Well 15/6-13 B was drilled to a measured depth of 12,378 feet and vertical depths of 11,309 feet below the sea surface.

All three wells were all terminated in the Skagerrak formation in the Upper Triassic.

The wells have been permanently plugged and abandoned and were drilled by the Songa Trym drilling facility  that will now move on to drill another Statoil-operated well on the UK shelf.