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GEOCHEMICAL PREREQUISITES FOR OIL CONTENT OF THE LOWER AND MIDDLE CAMBRIAN INIKAN FORMATION ROCKS IN THE SOUTHEAST OF THE SIBERIAN PLATFORM

T. M. Parfenova 1,2, D. S. Melnik 1,2, I. V. Korovnikov 1,2

1 A.A.Trofimuk Institute of Petroleum Geology and Geophysics SB RAS; 2 Novosibirsk State University, Novosibirsk, Russia

Modern study of Cambrian deposits on the territory of the Lena-Amga interfluve near Pokrovsk shown that wells penetrated a thick section of the Inikan Formation rocks enriched with organic matter (OM). It was established that rocks were potentially oil-generating, with high and moderate remaining generative potential, the OM catagenesis corresponds to the initial stage of mesocatagenesis. Autochthonous, parautochtonous and allochtonous bitumens were identified in the Inikan Formation. Allochtonous bitumens are concentrated in the rocks of its lower part. This makes it possible to consider the Inikan Formation in the southeast of the Siberian Platform as an unconventional source of hydrocarbon raw materials – shale oil. The origin of migrated bitumens is associated with the generation of oils by two genetic sources: the first one is the rocks of the Inikan Formation, the second one is the Precambrian rocks. Hydrocarbons of parautochthonous and allochtonous bitumen are biodegraded.

Keywords: source rocks, bitumens, organic matter catаgenesis, oil content, Cambrian, Siberian Platform.

DOI 10.20403/2078-0575-2022-11с-64-71

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