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Geological Society, London, Special Publications; 2006; v. 254; p. 225-245;
DOI: 10.1144/GSL.SP.2006.254.01.12
© 2006 Geological Society of London

West of Shetland revisited: the search for stratigraphic traps

N. Loizou1, I. J. Andrews2, S. J. Stoker2 & D. Cameron2

1 Department of Trade and Industry, 1 Victoria Street, London SW1H 0ET, UK nick.loizou{at}dti.gsi.gov.uk
2 British Geological Survey, DTI Core Store, 376 Gilmerton Road, Edinburgh EH17 7QS, UK

The West of Shetland area has scope for the stratigraphic entrapment of hydrocarbons at various Jurassic to Palaeogene stratigraphic levels. Mapping and identification of such traps requires a fundamental understanding of the regional geology, the study of analogues and source kitchens, and a thorough approach to trap validation. Since 1982, 47 exploration wells have been positioned on Paleocene prospects with a significant stratigraphic component, but few have found hydrocarbons — many failing as a result of poor trap definition and overconfidence in the predictive use of amplitude anomalies. Hydrocarbon sourcing of many of the failed prospects was also poorly constrained. Few amplitude-related stratigraphic features could be tied with confidence to a viable source kitchen. The presence of a regional seal is a prerequisite ingredient for a successful Paleocene play. Many remaining undrilled, subtle prospects rely on a stratigraphic trapping component, and high-quality 3D seismic data are seen as an essential search tool. Examples of undrilled prospects are presented from the Paleocene of the northern Faroe-Shetland Basin and the Mesozoic of the East Solan Basin and Corona Ridge.





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