Abstract
Synopsis The Rannoch Formation of the NW Hutton oilfield is interpreted as a marine offshore to shoreface, storm-wave influenced deposit. Four facies are recognised in drill cores: 1) heterolithic beds; 2) laminated and hummocky cross stratified (HCS) micacaeous sandstone; 3) indistinctly laminated micaceous sandstone; and 4) structureless sandstone. Facies 1 is interpreted as an offshore to shoreface transition deposit with thin storm-emplaced sandstone beds. The remaining facies represent the products of shoreface deposition under storm conditions of varying severity. Associated bioturbated sandstones represent periods of fair weather reworking. The Rannoch Formation in the NW Hutton area is typical of the formation elsewhere in the UK northern North Sea and is therefore interpreted as a widespread, storm-dominated, offshore to shoreface regressive sequence.
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