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Geological Society, London, Special Publications; 1998; v. 137; p. 215-222;
DOI: 10.1144/GSL.SP.1998.137.01.17
© 1998 Geological Society of London

Worldwide Gas Hydrate Occurrences and Regional Case Studies

Origin of gas hydrate accumulations on the continental slope of the Crimea from geophysical studies

S. V. Bouriak & A. M. Akhmetjanov

Moscow State University, Vorobjevy Gory 119899 Moscow, Russia

The Sorokin Trough on the south-eastern Crimean margin (northern part of the Black Sea) is known for mud diapirism. Gas hydrates in the sea-bed sediments have previously been recovered from this area in 1988. During the TTR-6 cruise of the R/V Gelendzhik in 1996 gas hydrates were observed in five cores containing mud breccia. A comprehensive geophysical survey was carried out, which allowed more insight to be gained into the local distribution of gas hydrates and the linkage of hydrate accumulations to fluid vents. It is therefore suggested that gas hydrates in the study area have most probably been formed from allochthonous gas. Preliminary results from a lithological study of the gas hydrate bearing cores suggested a complex mechanism for the mud volcanoes from which the gas hydrates were sampled, and a complicated history of the gas which was a source for the hydrates.