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Two gas discoveries made

May 28, 2009, 09:45 CEST

Located in Middle Jurassic rocks, the Harepus discovery lies seven kilometres south of the Mikkel field. No formation testing has been done, but extensive data and cores have been collected.

“Preliminary calculations indicate 0.5 to one billion standard cubic metres of recoverable gas,” says Sivert Jørgenvåg, head of infrastructure-led exploration on the Halten Bank.

“A tie-back to Åsgard together with the Gamma discovery made in the same licence in 2008 will be considered.”

The discovery well was drilled in 247 metres of water to a total depth of 3,162 metres beneath the sea surface and terminated in Early Jurassic rocks.

It will now be permanently plugged before Ocean Vanguard leaves the location to drill an exploration well for StatoilHydro on production licence 159D in the Norwegian Sea.

The Corvus exploration well was drilled about 7.5 kilometres north-west of Oseberg C, and proved small quantities of gas in the Upper Jurassic Draupne formation.

“Reservoir thickness remains unclarified because the well, for technical reasons, could not be drilled deeper,” explains Tom Dreyer, head of infrastructure-led exploration in the North Sea.

“This means that a possible appraisal well will be needed before the size of the discovery can be evaluated.”

The well was drilled from Transocean Winner in 113 metres of water to a vertical depth of 3,991 metres and will now be permanently plugged and abandoned.

After this work is completed, the rig is due to drill an appraisal well on the Peon gas discovery in production licence 318.

Facts about the Harepus prospect
  • Licensees for production licence 312: StatoilHydro (operator) 59%, ExxonMobil Exploration & Production Norway AS 24%, and Eni Norge AS 17%
  • Exploration well designated 6407/6-7S
  • Well terminated in Early Jurassic sandstones
  • Production licence allocated under awards in predefined areas (APA) for 2003

    Facts about the Corvus prospect
  • Licensees for production licence 309: StatoilHydro (operator), 63.8%, Petoro AS 33.6%, and ConocoPhillips Skandinavia AS 2.6%
  • Exploration well designated 30/5-3 A
  • The discovery is untested, but extensive data and cores have been collected
  • The well was intended to prove petroleum in Cretaceous rocks on the north-west flank of the Oseberg block. Nothing was found in the Cretaceous, but small quantities of gas were proven in Draupner formation sands from the Upper Jurassic