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Journal of the Geological Society; 1995; v. 152; issue.2; p. 251-258;
DOI: 10.1144/gsjgs.152.2.0251
© 1995 Geological Society of London

Article

New evidence for evaporitic Middle Devonian lacustrine sediments with hydrocarbon source potential on the East Shetland Platform, North Sea

W. I. DUNCAN & N. W. K. BUXTON

Deminex UK Oil and Gas Limited, Bowater House, 68 Knightsbridge, London SWlX 7LD, UK

The UKCS (United Kingdom Continental Shelf) well 9/16-3 drilled on the western flank of the Beryl Embayment encountered a Middle Devonian sequence interpreted as part of the lacustrine Orcadian Basin. An anhydrite layer found within the sequence provides confirmation of the local development of hypersaline environments within the Orcadian Basin. Detailed geochemical analysis of a representative source interval equivalent to the Achanarras/Sandwick fish bed has revealed a close -affinity with contemporaneous Middle Devonian source rocks found in the Inner Moray Firth and crude oil from the Beatrice oil field.

Key Words: Middle Devonian • Orcadian Basin • lacustrine sedimentation • source rocks • evaporites




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