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UPPER JURASSIC – LOWER CRETACEOUS PETROLEUM COMPLEX OF THE EASTERN SIBERIAN PLATFORM

A. I. Sivtsev, O. N. Chalaya, I. N. Zueva

Institute of Oil and Gas Problems SB RAS, Yakutsk, Republic of Sakha (Yakutia), Russia

The article touches upon a problem of possible oil-bearing capacity of the continental deposits in the east of the Siberian platform where the Triassic-Lower Jurassic oil-and-gas content connected with the Upper-Paleozoic source potential has been established, but the potential of Upper Jurassic-Lower Cretaceous continental carboniferous deposits is not clearly understood. The authors have considered some features and nature of oil showings from the Upper-Jurassic deposits of the Bergeinsk and Oloi areas of the Lungkhin-Kelin trough of the Pre-Verkhoyansk foredeep. They give geochemical characteristics of oils belonging to light, sweet crude, paraffin, low-resin oils. The identity of hydrocarbons-biomarkers in the Bergeinsk-Oloi oils in structure and distribution is indicative of their uniform source and genetic relationship with the organic matter formed in the conditions of continental facies. According to geochemical data Upper-Jurassic deposits presented by a continental coal-bearing paralic formation initial organic matter of which is characterized by a mixed composition with a humic component distinctly predominant could serve as a producing strata for these oils. Comparing field and geological data, the authors anticipate that broken-down coal beds can serve as a peculiar oil reservoir (collecting basin). In the east of the Siberian platform within the Pre-Verkhoyansk foredeep and the adjacent part of the Vilyui syneclise, it makes sense to identify the Upper Jurassic-Lower Cretaceous continental deposits as an individual potentially hydrocarbon lithologic-and-stratigraphic complex.

Keywords: East of the Siberian plat form, Vilyui syneclise, Pre-Verkhoyansk foredeep, coal-bearing continental deposits, Upper Jurassic, Lower Cretaceous, prospects of oil-and-gas content.

DOI 10.20403/2078-0575-2018-1-81-87