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Geological Society, London, Special Publications; 1995; v. 93; p. 41-58;
DOI: 10.1144/GSL.SP.1995.093.01.07
© 1995 Geological Society of London

Shallow gas accumulation and migration in the western Irish Sea

Peter F. Croker

Petroleum Affairs Division, Department of Transport, Energy and Communications, Beggars Bush, Haddington Road, Dublin 4, Ireland

The Irish Sea has long been known to contain extensive areas of shallow gas accumulation, particularly in the area southwest of the Isle of Man. More limited occurrences of seabed features associated with shallow gas migration, such as columnar disturbances, seabed doming and pockmarks, have also been reported. Until now this gas was generally assumed to be of biogenic origin.

Recently acquired route survey data have provided new insights into the distribution of both gas accumulation and gas migration in this area, as well as identifying areas of active seepage. It is proposed that the gas originates as coalbed methane or thermogenic gas in the extensive Carboniferous deposits underlying the region. This has considerable significance for hydrocarbon exploration in the area.





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