B. M. Valyaev, S. A. Leonov, G. A. Titkov, and M. Yu. Chudetsky, Oil and Gas Problems Institute Russian Academy of Sciences
Isotopic geochemistry methods received wide acceptance in different branches of geology in the second half of the XX century. In oil and gas geology, research on carbon isotopes of organic matter and bitumen not only generally corroborated the traditional views on the organic concept of the genesis of oil and gas, but also provided significant criteria for separating stages of hydrocarbon generation of various composition in agreement with the stages of sedimentary rocks transformation in diagenesis and catagenesis. However, geological data on the relation between hydrocarbon accumulations and deep faults, the wide vertical range of oil and gas accu-mulation in individual deposits, the priority of vertical migration testified to the common and deep character of hydrocarbons genesis in the whole sedimentary section.
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