6307/1-1 S

General

Well 6307/1-1 S was drilled to test the Silfari prospect in the Froan Basin in the Norwegian Sea. The primary exploration target for the well was to investigate the reservoir properties and the petroleum potential in Permian carbonate rocks (equivalent to the Wegner Halvø formation in the Late Permian at East Greenland). The secondary exploration target was to collect data for potential reservoirs in the Middle to Early Jurassic (the Fangst and Båt groups).

Operations and results

Wildcat well 6307/1-1 S was spudded with the semi-submersible installation Leiv Eiriksson on 18 October 2018 and drilled to TD at 4114 m in igneous rocks. Operations proceeded without significant problems. The well was drilled with seawater and hi-vis pills down to 329 m, with KCl/Polymer/GEM water-based mud from 329 to 923 m, with Baracarb High Performance water-based mud from 923 to 3119 m and with Baracarb HTHP water-based mud from 3119 m to TD.

The well encountered good reservoir sands in the targeted Jurassic formation but with no hydrocarbon indications. Pressure data showed a clear water gradient of 1.02 g/cc. in the Jurassic. The well penetrated top Triassic Grey Beds at 2775 m (2610.3 m TVD) and top Red Beds at 2839 m (2665.7 m TVD). The deepest section below 3385 m (3146.5 m TVD) consists of undated igneous rocks. The deep Permian target was thus not present, and no hydrocarbons were present in these rocks.

Numerous weak oil shows in the form of visible and/or fluorescing cut were recorded in the well, beginning at 1811 m in the Lange formation. The shows may have been influenced by mineral fluorescence and mud type.

One core was cut from