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Most researchers consider the black shale Bazhenov Formation as the main source of petroleum in the West Siberian fields. Detailed sedimentological, mineralogical and geochemical investigations reveal that there are three main types of Bazhenov Formation rocks: (i) clayey-siliceous; (ii) argillites; and (iii) anomalous clayey-silt-sandy rocks. The first type is characterized by more frequent benthic...