The Gannet A field is a mature oil and gas field in the central North Sea. Its Upper Tay reservoir consists of generally high quality deepwater turbidite sandstones of Eocene age in a large, low-relief, mainly structural, partly stratigraphic trap. A 53-ft oil rim contains 190 million barrels of stocktank oil with 190 billion standard cubic feet (= Bscf) dissolved gas, overlain by a 325 Bscf gas cap. The reservoir sand has 30–33% porosity with 1/2-2 Darcy permeability. Reservoir quality deteriorates from 95–99% net-to-gross in the northwest to 40–50% in the south. The field has been developed with 11 evenly...

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