Devonian bituminous shales of the Dmitriyevskoye field of the Kuznetsk Basin have been studied from the outcrop near the Sergeyevsky village. The rocks contain type I kerogen (sapropelic lacustrine): HI – 570-879 mg HC/g TOC; δ¹³C_TOC is −35 to −32 ‰; 9,9 % hydrogen in kerogen; nC₂₇/nC₁₇<1 and P_aq>P_wax in n-alkanes; and Ts/Tm<1 in hopanes. High C₂₈ levels in the steranes are typical of the lake organic matter. The presence of a terrestrial contribution is indicated by the increased tricyclane index and concentrations of certain odd high-molecular alkanes in many samples. An admixture of ground vegetation was also recorded during the study of the thin sections. Significant concentrations of C₂₉ steranes (C₂₉/C₂₇>>1) are of algal origin, typical of the Proterozoic and traceable to the Devonian, as well as retene found in all bitumens. A unique feature of Dmitriyevskoye bituminous shales is a very high content of triaromatic steroids (46.1 to 92.6 %). The diagenesis of bituminous shales took place in clay sediment (in steranes βα/(αα+ββ) >3) under no sulfur excess in bottom water (in homohopanes C₃₅/C₃₄<1, and low concentrations of dibenzothiophenes). According to coal petrography data (R^o_vt – 0.50 to 0.57 %) consistent with the results of pyrolysis, the elemental composition of kerogen and the triaromatic steroid maturation, the organic matter reached proto- and early mesocatagenesis stages. Allochthonous bitumens recorded in the northeast of the bituminous shale outcrop have several differences: their source organic matter accumulated in the carbonate sediments (low diasterane contents) of a basin with slightly increased salinity (increased gammacerane concentrations), with a lower admixture of terrestrial organic matter (low tricyclane index). These bitumens have some biodegradation signs (higher asphaltene content, increased Pr/nC₁₇ ratios in acyclic hydrocarbons). Judging by the pyrolytic parameter HI and the abundance of hydrogen in kerogens, the bituminous shales of the Dmitriyevskoye field have a high hydrocarbon generating potential.

Irina D. Timoshina  ORCiD  Scopus
Candidate of Geological and Mineralogical Sciences,
Senior Researcher
The Trofimuk Institute of Petroleum Geology and Geophysics,
Siberian Branch of the Russian Academy of Sciences,
3, prospekt Koptyuga, Novosibirsk, 630090, Russia
e-mail: TimoshinaID@ipgg.sbras.ru
ResearcherID: AAT-9374-2020
SPIN-код: 164437

​Aleksandr N. Fomin  ORCiD  Scopus
Doctor of Geological and Mineralogical Sciences,
Chief Researcher
The Trofimuk Institute of Petroleum Geology and Geophysics,
Siberian Branch of the Russian Academy of Sciences,
3, prospekt Koptyuga, Novosibirsk, 630090, Russia
e-mail: FominAN@ipgg.sbras.ru
ResearcherID: W-2215-2019
SPIN-код: 68499

Lyubov’ S. Borisova  ORCiD  Scopus
Doctor of Geological and Mineralogical Sciences,
Leading Researcher
The Trofimuk Institute of Petroleum Geology and Geophysics,
Siberian Branch of the Russian Academy of Sciences,
3, prospekt Koptyuga, Novosibirsk, 630090, Russia
e-mail: BorisovaLS@ipgg.sbras.ru
ResearcherID: AAT-9411-2020
SPIN-код: 60332

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