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17/10/2010 Total E&P Norge AS, operator of production licence 102 C, is in the process of completing the drilling of wildcat well 25/5-7. The well is located about 20 kilometres northeast of the Heimdal field in the North Sea.
The primary exploration target for the well was to prove petroleum in the Middle Jurassic reservoir rocks (the Brent group). The secondary target was to prove petroleum in the Lower Jurassic reservoir rocks (the Statfjord formation).
A gas column of 70 metres was encountered in the Brent group with better reservoir rocks and reservoir quality than expected. The Statfjord formation also has good reservoir properties, but it is water-bearing. Preliminary estimates of the size of the discovery range between 2.4 and 3.2 million cubic metres of recoverable oil equivalents.
The well was not formation tested, but comprehensive data collection and sampling have been carried out. A gas-condensate ratio of about 3000 Sm3/Sm3 is expected. The licensees in the production licence will consider producing the discovery via the Heimdal field.
The well is the first exploration well in production licence 102 C. The well was drilled to a vertical depth of 3,045 metres below sea level, and was terminated in the Hegre group in the Upper Triassic.
Water depth at the site is 119 metres. The well will now be plugged and abandoned.
Well 25/5-7 was drilled by Ocean Vanguard. The drilling facility will now proceed to production licence 303, north of the Sleipner area in the North Sea, to drill appraisal well 15/6-11 S, where Statoil ASA is the operator.