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Russian Geology and Geophysics

2018 year, number 8


V.A. Kashirtsev1,2,3
1A.A. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia
2Institute of Oil and Gas Problems, Siberian Branch of the Russian Academy of Sciences, ul. Oktyabrskaya 1, Yakutsk, 677891, Russia
3Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia
Keywords: Bitumen, hydrocarbons, asphaltenes, occlusion


Homologous series of alkenes and dimethylalkanes mostly with the odd or even number of carbon atoms in the molecule have been identified in chloroform extracts from the organic matter of the Upper Paleozoic deposits of the Vilyui syneclise, penetrated by the superdeep well SV-27 at depths below 5 km. It is assumed that these unusual hydrocarbons resulted from the destruction of asphaltene occlusions under severe P-T conditions at great depths and that the hydrocarbon generation began in the zone of postdiagenetic transformations of sediments. This hypothesis was tested in the sections of deposits whose organic matter underwent catagenesis of different grades. On the basis of these results, zones of emergence, transition, and destruction of occlusions have been recognized.