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Shell UK Exploration and Production, Shell-Mex House, Strand, London, UK
1 The Geochem Group Limited, Chester Street, Chester CH48RD, UK
2 Department of Applied Geology, University of New South Wales, Sydney, NSW 2033, Australia
The deltaic Brent Group sequence consists of three formations. The Rannoch is a shoreface section; the Etive is a barrier facies. The Ness contains three members: the Enrick, representing a marginal marine back barrier environment; the Oich, an organic-rich open lagoonal shale and the Foyers, a largely fluvially-dominated delta-top or coastal plain deposit. During the Bajocian, facies belts rapidly prograded northwards until the northern part of the area was reached. Here progradation stalled and thick delta front sediments were deposited. Shortly before the delta began to retreat, a temporary relative sea-level rise pushed the delta front southwards resulting in the deposition of an intra-Ness barrier. The progradational sequence is underlain by the Aalenian to lowermost Bajocian Broom Formation fan delta and overlain by the transgressive Tarbert sequence of largely Bathonian age.
This article has been cited by other articles:
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  T. R. Olsen and R. J. Steel The significance of the Etive Formation in the development of the Brent system: distinction of normal and forced regressions Geological Society, London, Special Publications, 2000; 172: 91 - 112. [Abstract] [PDF]
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