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Differentiation of Oils in Tatarstan Based on the Composition of Saturated Biomarkers

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Abstract—

Oils in Tatarstan were determined to have been generated in at least two source rock formations, whose organic matter (OM) differed in genesis, redox conditions of sedimentation, and maturity. The oils of type 1 are hosted in Devonian terrigenous reservoir rocks, whereas the oils of type 2 occur in overlying reservoirs. Differences between the oils are reliably identified in most compositional parameters of saturated biomarkers, with the values of the two oil groups not overlapping for two parameters: Ts/Tm and t22/t21. The maturity of the group-1 oils is statistically significantly higher than that of the group-2 ones. The source rocks are identical at the macrolevel: the original organic matter was deposited in marine sedimentation environments under reducing conditions, which is consistent with literature data. Comparison of the compositions of the oils and OM of the Domanik Formation indicates that rocks of the Mukhanovo–Erokhov trough were not involved in producing oil accumulations in Tatarstan. Differences were also detected between genetic characteristics of oils from the terrigenous Devonian rocks and Domanik Formation in the arch part of the area. Organic matter in the arch part of the territory could be significantly involved in the generation of oil accumulations hosted in reservoirs in the Semiluk and higher horizons. It is demonstrated that earlier conclusions that the source rocks of certain oil groups differed in lithology are groundless. To estimate the confidence interval for the median values, a criterion of signs was proposed, which has never before been employed in organic geochemistry.

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Funding

This study was carried out under a government-financed research project for the Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences.

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Authors and Affiliations

  1. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 119991, Moscow, Russia

    M. B. Smirnov & N. A. Vanyukova

  2. Geological Faculty, Moscow State University, 119991, Moscow, Russia

    N. P. Fadeeva

Authors
  1. M. B. Smirnov
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  2. N. P. Fadeeva
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  3. N. A. Vanyukova
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Correspondence to M. B. Smirnov or N. P. Fadeeva.

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Translated by E. Kurdyukov

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Smirnov, M.B., Fadeeva, N.P. & Vanyukova, N.A. Differentiation of Oils in Tatarstan Based on the Composition of Saturated Biomarkers. Geochem. Int. 59, 501–515 (2021). https://doi.org/10.1134/S0016702921050074

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