Key words: Western Siberia, the genetic types of oils, the conditions of formation of deposits, the mixed type of oil, gas isotopy, the molecular parameters of oils.
On the basis of molecular and isotopic parameters of oil and gas shows the participation of different source rocks in the formation of deposits of the south-east of Western Siberia. The three main genetic types are distinguished among the studied oils. They were generated source rocks of the Upper Jurassic (Bazhenov type), Jurassic and Triassic (Togur type) and Paleozoic (Paleozoic type). Shown that many hydrocarbon fluids do not belong to any of the selected type, and are mixed fluids.Scheme of deposits formation of oil and gas Kazanskoye field was proposed based on the investigation results of oils, condensates and gases.
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