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  | isbn    = 0-89181-602-X

  | isbn    = 0-89181-602-X

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The Mandal-Ekofisk(!) petroleum system in the Central Graben of the North Sea contains 21.4 billion bbl of oil and 39.4 trillion ft³ of gas in 39 fields.<ref name=ch03r3>Cornford, C., 1994, The Mandal-Ekofisk(!) petroleum system in the Central Graben of the North Sea, in Magoon, L., B., Dow, W., G., eds., The Petroleum System—From Source to Trap: AAPG Memoir 60, p. 537–571.</ref> The age of the reservoir rock ranges from Devonian to Tertiary age with about 85% of the petroleum in rock adjacent to the Cretaceous-Tertiary boundary, specifically the Ekofisk Formation of Late Cretaceous age. Based on geochemical evidence, the Upper Jurassic (Kimmeridgian) to Lower Cretaceous source rock is the Mandal Formation. A positive oil-source rock correlation indicates a known system.

The Mandal-Ekofisk(!) petroleum system in the Central Graben of the North Sea contains 21.4 billion bbl of oil and 39.4 trillion ft³ of gas in 39 fields.<ref name=ch03r3>Cornford, C., 1994, [http://archives.datapages.com/data/specpubs/methodo2/data/a077/a077/0001/0500/0537.htm The Mandal-Ekofisk(!) petroleum system in the Central Graben of the North Sea], in Magoon, L., B., Dow, W., G., eds., The Petroleum System—From Source to Trap: [http://store.aapg.org/detail.aspx?id=1022 AAPG Memoir 60], p. 537–571.</ref> The age of the reservoir rock ranges from Devonian to Tertiary age with about 85% of the petroleum in rock adjacent to the Cretaceous-Tertiary boundary, specifically the Ekofisk Formation of Late Cretaceous age. Based on geochemical evidence, the Upper Jurassic (Kimmeridgian) to Lower Cretaceous source rock is the Mandal Formation. A positive oil-source rock correlation indicates a known system.

==Geologic setting==

==Geologic setting==