Abstract
The cherty-clay rocks of the Bazhenovo formation offer prospects for finding a new type of petroleum deposit, as indicated by the flows of oil recovered from it in western Siberia. Jurassic Neocomian bituminous sediments occur in an area of more than one million km/sup 2/ on the West Siberian platform. In the Middle Ob' region, they have been assigned to the Bazhenovo formation. The Bazhenovo lies 2.5-3 km beneath the surface, its average thickness is 30 m, and the formation temperature is 80-100/sup 0/C. Over the greater part of the area, the Bazhenovo is overlain and underlain by argillaceous units, which are fluid-impervious units of the third class, that is, they are virtually impervious to oil. They isolate the Bazhenovo from permeable sandy beds and make it a closed system with anomalously high formation pressures. The paper describes the texture of the rocks, lithology, forms of organic matter, geochemistry, physical properties, and overall geology. 8 references, 5 tables.
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