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In the Danish North Sea, the chalk of the Danian Ekofisk Formation is largely pelagic and includes horizons of clay‐sized quartz and/or clay minerals. The upper part of the Ekofisk Formation (“Ekofisk Porous”) has reservoir potential, whereas the lower part of the formation (“Ekofisk Tight”) is of low permeability. The Ekofisk Formation was studied in wells Rigs‐1, Rigs‐2 and SA‐1 in the South Arne...
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