The Norwegian Petroleum Directorate announced Thursday that Wintershall Norge AS has made a minor oil discovery near the Vega Sor field in the north-eastern North Sea.
Wintershall Norge, operator of production license 248, is currently in the process of completing the drilling of wildcat well 35/11-18 and appraisal well 35/11-18 A. In its primary exploration target, well 35/11-18 encountered a 902 foot thickness of moderate to good reservoir quality in the Brent group Middle Jurassic reservoir rocks and proved light oil in the Tarbert and Oseberg formation, with columns of 36 and 9 feet, respectively. In the secondary exploration target, the well encountered an 26 foot hydrocarbon column of good to poor reservoir quality.
The objective of appraisal well 35/11-18 A was to investigate the extent of the reservoir and the hydrocarbon columns. The well was drilled about 1,500 feet south of the discovery well and proved gas and oil in two Upper Jurassic sandstones with net thicknesses of 108 and 78 feet, respectively, with poor to good reservoir quality. The well encountered oil throughout the Brent group, which is 885 feet, with moderate to good reservoir quality. The well also encountered a 150 foot column of light oil in the Lower Jurassic Cook formation.
Preliminary estimates place the size of the discovery between 35.3 and 105.9 million cubic feet of recoverable oil. Extensive data collection and sampling has been carried out, including two formation tests in the Cook and Oseberg formation in 35/11-18 A. The tests show good flow properties with stable flow pressure and low pressure drop, with good permeability.
Well 35/11-18 and 18 A were drilled by the Borgland Dolphin (mid-water semisub) to a measured depth of 12,332 feet and 13,188 feet below the sea surface, respectively. The wells, which have been permanently plugged and abandoned, are the second and third exploration wells in production license 248. Partners in PL 248 will now evaluate the results, while the Borgland Dolphin moves on to drill appraisal well 25/10-14 in the North Sea in production license 571.
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