The Forties field, a large oil pool discovered in 1970, is in the northern part of the British sector of the North Sea, 175 km (110 mi) east of Peterhead, Scotland, in water depths of 91 to 131 m (300–430 ft). The reservoir is a sandstone of Paleocene age at a depth of about 2,135 m (7,000 ft), at the base of a thick Cenozoic section consisting primarily of mudstone. The Paleocene sandstone/mudstone sequence is underlain by Danian and Maestrichtian chalk. The trap is a broad low-relief anticlinal feature with a closed area of 90 sq km (35 sq mi). Maximum gross oil column is 155 m (509 ft). Recoverable oil is estimated at 1.8 billion bbl from an in-place figure of 4.4 billion.
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Pamela J. Thomas (1974) studied this question.