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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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The Ekofisk field is a landmark in the history of petroleum exploration. With recoverable reserves estimated at 1 billion bbl, it is the first major oil discovery in the now-burgeoning North Sea oil patch. Ekofisk is on a salt structure, and produces from approximately 700 ft of highly porous Danian limestone. Scanning electron micrographs show that this limestone is a typical chalk, formed almost entirely of coccoliths and planktonic foraminifers. Extensive fracture systems have been noted in cores. The original intergranular porosity of the rock is reduced in places by the precipitation of secondary calcite cement, possibly associated with stylolite formation.
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