Sokkeldirektoratet

Barents Sea – Lower to Middle Jurassic plays

Group/Formation Age Area Reservoir rock Depositional environment Trap Source rock Critical factors Examples of fields Examples of discoveries Examples exploration wells
bjl,mj-5 Kapp Toscana Group with Tubåen, Nordmela, Stø and Fruholmen Formations Rhaetian- Norian Hammerfest Basin Sandstone Fluvial, deltaic, estuarine tidal and shallow marine Rotated fault blocks and horst structures Upper Jurassic shale (Hekkingen Formation), possible contribution from Triassic shales The thickness of Nordmela and Stø Formations decreases towards northeast. The presence of a cap rock with sufficient sealing capacity. Preservation and leakage of petroleum owing to tilting, reactivation of faults and Cenozoic uplift and erosion, especially for shallow and/or truncated structures.
bjl,mj-6 Kapp Toscana Group with Tubåen, Nordmela, Stø and Fruholmen Formations Hettangian- Norian Troms-Finnmark Fault Complex, Tromsø Basin, Veslemøy High, Bjørnøya Basin, Stappen High Sandstone Fluvial, deltaic, estuarine tidal and shallow marine Rotated fault blocks and horst structures Upper Jurassic shale (Hekkingen Formation), possible contribution from older source rocks The thickness of Nordmela and Stø Formations decreases towards northeast. The presence of a cap rock with sufficient sealing capacity. Preservation and leakage of petroleum owing to tilting, reactivation of faults and Cenozoic uplift and erosion, especially for shallow and/or truncated structures.
bjl,mj-7 Kapp Toscana Group with Tubåen, Nordmela, Stø and Fruholmen Formations Hettangian- Norian Bjarmeland Platform and Nordkapp Basin Sandstone Fluvial, deltaic, estuarine tidal and shallow marine Rotated fault blocks and horst structures. In the Nordkapp Basin: Stratigraphic traps related to salt diapers, rotated fault blocks may also occur Early to Middle Triassic Steinkobbe Formation The thickness of Nordmela and Stø Formations decreases towards northeast. The presence of a cap rock with sufficient sealing capacity. Preservation and leakage of petroleum owing to tilting, reactivation of faults and Cenozoic uplift and erosion, especially for shallow and/or truncated structures.