Bituminous strata of the Eastern Siberia and the Far East and their petroleum potential prospects

Among the different types of petroleum source layers there is a group of "bituminous strata" characterized by high content of sapropel organic matter with relatively low and medium degree of maturity. They provide oil-bearing potential of reservoirs and can be syngenetically oil-bearing.

Kuonamka Formation on the Siberian platform is represented by clayey-carbonate-siliceous rocks with thickness of 30-100 m with algo-planktonic cyanophytic organic matter (high katagenesis in the central part of Vilyuy Syncline). Considering the area of 628 thousand sq. km, the scope of oil generation is 658.7 billion tons, the scope of migration of oil is 526.9 billion tons, gas - 222.3 trillion cubic km.

Upper-Malginskaya subformation is poorer than Kuonamka Formation, but similar to it outwardly and has a greater thickness. Considering the area of 66.8 thousand sq. km, the scope of migration of oil is 123 billion tons, gas - 44.5 trillion cubic km.

Siliceous strata of the Oligocene-Miocene are known in the Northern Sakhalin Basin with great thickness, containing the most high-lipidic organic matter of diatom plankton, which determines the high bituminosity and specific structure of the pore space of rocks that promotes redistribution of bitumen and generation of oil accumulations within these strata.