Some gas-geochemical features of sediments in the East-Siberian Sea

In the article it is given a comprehensive gas-geochemical analysis of sediments from the East-Siberian Sea, along the NS profile (Billings Cape-Mendeleev Ridge). It is for the first time that the features of hydrocarbon gases distribution in sediments are described in relation with a grain size and chemical compositions. Gas seepage in neo-tectonic faulting has been found. The methane content in sediments (up to 2.4 % vol. in headspace) indicates favorable sites for gashydrates in a central part of the sea. Isotopic composition of C13-CH4 indicates the thermogenic origin. The obtained data could be applied for the hydrocarbon deposits forecasting in the investigated area.