The Forties field.

Abstract

The Forties Field is a large oil poole which was discovered in 1970 in the northern part of the British sector of the North Sea some 175 km (110 miles) east of Peterhead, Scotland, in water depths of 91-131 metres (300-430 ft.). The reservoir is a sandstone of Paleocene age occurring at a depth of about 2135 metres (7000 ft.) at the base of a thick Cainozoic section, consisting primarily of mudstone. The Paleocene is a sandstone\/mudstone sequence and is underlain by Danian and Maastrichtian chalk. The trap is a broad low-relief anticlinal feature with a closed area of about 90 km\u00B2 (35 sq miles). Maximum gross oil column is 155 metres (509 ft.). Recoverable oil is estimated at 1.8 billion barrels from an in-place figure of 4.4 billion.