Gas discovery near Heimdal field in the North Sea

Oct 19, 2010 12:00 AM

Total E&P Norge, operator of production licence 102 C, is in the process of completing the drilling of wildcat well 25/5-7, located about 20 km 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 with aquifers.

Preliminary estimates of the size of the discovery range between 2.4 and 3.2 mm cm of recoverable oil equivalents.

The well was not formation tested, but comprehensive data collection and sampling have been carried out.  A gas-condensate reservoir of about 3,000 cm is expected.

The licensees in the production licence will consider  producing the discovery via the Heimdal field.

The well is the first wildcat well in production licence 102 C (link to the NPD's fact page). 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 travel to production licence 303, north of the Sleipner area in the North Sea, to drill delineation well 15/6-11 S, where Statoil is the operator.

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