BG Group has concluded drilling of wildcat wells 34/3-4 S and 34/3-4 A in production license 373 S, both of which the company now classifies as dry following data sampling and acquisition. The wells lie 5 km east of Knarr field in the northern North Sea.
The purpose of well 34/3-4 S was to investigate a large channel system in reservoir rocks in the Pleistocene, BG said. The well encountered a 250-m thick channel system, about 50 m of which was of very good reservoir quality, it said. Traces of gas were encountered in two thin sandstone layers.
Drilled to a measured depth of 1,607 m and vertical depth of 1,584 m, 34/3-4 S was terminated in the Hordaland group in the Miocene.
The purpose of well 34/3-4 A was to prove petroleum in lower Jurassic reservoir rocks—the Cook formation. The well encountered 110 m of the Cook formation, 53 m of which was sandstone with good reservoir quality and traces of gas, the company said.
Drilled to a measured depth 4,535 m and vertical depth 4,321 m below the sea surface, the 34/3-4 A was terminated in Amundsen formation in the Lower Jurassic.
The wells lie in 406 m of water.
The exploration wells, drilled by the Transocean Searcher drilling facility, are the fifth and sixth in BG-operated PL 373 S (OGJ Online, Aug. 12, 2008). The rig will now move to drill wildcat well 34/3-5 S in the same license.