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Thermodynamic Modeling of Catagenetic Transformation of Rock with a High Organic Matter Content

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Abstract

The paper presents the results of thermodynamic modeling of a transformation of a kerogen-bearing sedimentary rock within the temperature range of 50–400°С at a gradually increasing pressure from 300 to 2200 bar. A gradual increase in temperature and pressure, starting from 50°С, leads to the formation of the lighter and more oxidized type of kerogen. The methane–carbon dioxide gas phase is present in the entire range of specified temperatures and pressures. The coexistence of kerogen and oil was obtained only in one calculation for 325°С and 1750 bar. In the presence of kerogen in the system, the oil consists of 92% alkane hydrocarbons. With a further increase in temperature, the kerogen disappears and a share of aromatic hydrocarbons in oil rises to 49–77%.

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Authors and Affiliations

  1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academу of Sciences, 119991, Moscow, Russia

    E. S. Sidkina & M. V. Mironenko

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  1. E. S. Sidkina
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  2. M. V. Mironenko
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Correspondence to E. S. Sidkina.

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Translated by L. Mukhortova

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Sidkina, E.S., Mironenko, M.V. Thermodynamic Modeling of Catagenetic Transformation of Rock with a High Organic Matter Content. Geochem. Int. 58, 1505–1510 (2020). https://doi.org/10.1134/S0016702920130108

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  • DOI: https://doi.org/10.1134/S0016702920130108

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