Statoil Petroleum has made an oil discovery near the Oseberg South field in the central part of the North Sea, Norway.
Wildcat well 30/9-28 S in production licence 104 was drilled 5.5km west of the field and encountered a 20m gas column, with 10m of this in sandstone and having good reservoir quality in the Tarbert formation.
The primary exploration target was to prove petroleum in lower, and middle Jurassic reservoir rocks, including the Tarbert formation and upper part of the Statfjord group.
The secondary exploration target was aimed at proving petroleum in lower Jurassic reservoir rocks, the lower part of the group.
The gas/water contact in the Tarbert formation has been estimated at 2,870m based on pressure data and proven at 3,506m.
In the Statfjord group, the well encountered a 12m gas column in sandstone with moderate reservoir quality.
Drilling proved that the secondary exploration target in the lower part of the Statfjord group is aquiferous.
Statoil plans to consider this discovery for development as part of the Oseberg Future Phase 2 project. It carried out data acquisition and sampling of the well, the 24th exploration well drilled in production licence 104.
Well 30/9-28 S was drilled by the Songa Delta drilling facility to a measured and depth of 4,083m and 3,928m below the sea surface respectively. It will be permanently plugged and abandoned.
Songa Delta will now move to drill a shallow gas pilot, 30/6-U-27 in production licence 053.
Image: The wildcat well 30/9-28 S is in production licence 104. Photo: courtesy of Norwegian Petroleum Directorate.