Abstract
The thermodynamic model of stage oil formation has been proposed: (1) transformation of sedimentary kerogen at increasing temperature and pressure and (2) subsequent transformation of newly formed immature oil (bitumoid) in the reservoir rock. Calculations have shown that immature aromatic-asphaltene oil is formed in the source rock, starting from a temperature of 50 °C. With further increase of temperature and pressure the tendency to change the hydrocarbon composition of bitumoid in the direction of the aromatic-mixed type is observed, and at 325 °C there is a sharp increase in the amount of oil formed and a fundamental change in the hydrocarbon composition (alkanes are dominated). An even lighter oil is formed from bitumoid in the reservoir reservoir at 325 °C in the presence of liquid water in the system. It is shown that water is a necessary component for the formation of light hydrocarbons from high molecular weight ones. The results allow to make the following conclusions: (1) high-molecular hydrocarbons can be an intermediate element in crude oil formation; (2) light alkane oils are the result of their transformation in the process of hydrocracking in the reservoir.
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This work is conducted under the GEOKHI RAS state assignment.
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Sidkina, E.S., Mironenko, M.V. (2023). Thermodynamic Modeling of Stage Formation of Oil from Type II Kerogen. In: Kolotov, V.P., Bezaeva, N.S. (eds) Advances in Geochemistry, Analytical Chemistry, and Planetary Sciences. Springer, Cham. https://doi.org/10.1007/978-3-031-09883-3_10
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