North Sea – Cretaceous plays
| Group/Formation | Age | Area | Reservoir rock | Depositional environment | Trap | Source rock | Critical factors | Examples of fields | Examples of discoveries | Examples exploration wells | |
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| nkl-2 | Cromer Knoll Group with Agat Formation | Berriasian? Cenomanian? | Sogn Graben | Sandstone | Deep marine | Stratigraphic | Upper Jurassic shale (Draupne and Heather Formations), Lower to Middle Jurassic shale and coal (Ness Formation?) | Distribution of reservoir |
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| nku-2 | Shetland Group with Hod, Tor and Ekofisk Formations, Rogaland Group with Vidar Formation. | Santonian(?) – Early Paleocene | Central part of Central Graben from Albuskjell to Hod | Chalk | Open marine, redeposited | Halokinetic and stratigraphic | Upper Jurassic (Mandal and Draupne Formations) | Reservoir quality |
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| nku-3 | Shetland Group with Hod, Tor and Ekofisk Formations, Rogaland Group with Vidar Formation. | Santonian(?) – Early Paleocene | Surrounding parts in Central Graben outside the large chalk fields | Chalk | Open marine, redeposited | Halokinetic and stratigraphic | Upper Jurassic (Mandal and Draupne Formations) | Reservoir quality |
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| nku-4 | Shetland Group with Hod, Tor and Ekofisk Formations, Rogaland Group with Vidar Formation. | Santonian(?) – Early Paleocene | Utsira High | Chalk | Open marine, redeposited | Halokinetic and stratigraphic | Upper Jurassic (Mandal and Draupne Formations) | Reservoir quality |
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| nku-5 | Shetland Group with Kyrre Formation, Tryggvason Formation is possible | Cenomanian - Maastrichtian | Sogn Graben | Sandstone | Deep Marine | Mainly statigraphic, structural is a possibility | Upper Jurassic shale (Draupne- and Heather Formation), Lower to Middel Jurassic shale and coal | Distribution of reservoir and seal |
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