Gas geochemical indicators of coal, oil and gas potential of sedimentary basins and geostructures in the central and western part of the East Siberian Sea

According to the data of gas sampling of well cores and seafloor sediments in the central and western parts of the East Siberian Sea shelf, it was found that different gas geochemical parameters (weight concentrations, molecular weight, moisture coefficients, maturity of hydrocarbon fraction and isotope composition of methane carbon) are typical of hydrocarbon gases of the studied lithotypes. Biochemical gases of recent sediments in bottom sediments are represented by syngenetic, epigenetic and heterogeneous gases; magmatic - igneous formations; metamorphogenic - coal and gas formations, gas deposits, solid bitumen, condensate-gas, condensate, oil and gas, gas-oil deposits and gas hydrates. Eleven genetic groups of hydrocarbon gases have been identified that are quite close to analogues in the Lena-Vilyuisky, Irkutsky Verkhne-Bureinsky, Anadyrsky, Sakhalinsky, and Okhotsky coal and oil-gas basins of the Russian East. Based on the data obtained, the predicted areas of oil and gas formations occurrence were outlined, and a gas geochemical assessment of the oil and gas prospects was carried out in the study area