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Dissociation Kinetics of Methane Hydrate in Frozen Rocks under Decreasing External Pressure: Mathematical and Experimental Modeling

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Abstract

The results of mathematical and experimental modeling of dissociation of pore methane hydrate in ice- and gas-bearing sediments with a decrease in the external pressure below equilibrium are presented. The described model of pore gas hydrate dissociation at negative temperatures, along with the experiment, makes it possible to calculate the kinetics of this process. A comparative analysis of the results is conducted. The proposed mathematical model confirms the trend of decreasing hydrate saturation of frozen soil in the form of \({{S}_{h}}\sim A{{\tau }^{{ - n}}}\) obtained previously in experiments. These experiments have made it possible to calculate the coefficients A and n, while the mathematical modeling shows how these coefficients depend on the problem parameters. The theoretically estimated properties of the coefficient fully confirm the experimental data. The results of experimental and mathematical modeling have implications for key factors that determine the self-preservation of pore methane hydrates in frozen sediments.

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Funding

This work was supported by the Russian Science Foundation (grant nos. 22-67-00025, 21-77-10074, and 22-17-00112). We are grateful to Ministry of Science and Higher Education of the Russian Federation for the support provided to Tomsk State University under the project “Priority-2030.”

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Authors and Affiliations

  1. Institute for Problems of Geothermy and Renewable Energy, Branch of the Joint Institute for High Temperatures, Russian Academy of Sciences, 367030, Makhachkala, Russia

    M. M. Ramazanov & N. S. Bulgakova

  2. Sadovskii Institute of Geosphere Dynamics, 119334, Moscow, Russia

    M. M. Ramazanov, D. A. Davletshina & N. E. Shakhova

  3. Dagestan State University of National Economy, 367008, Makhachkala, Russia

    N. S. Bulgakova

  4. Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997, Moscow, Russia

    L. I. Lobkovsky

  5. Science Department, Tomsk State University, 634050, Tomsk, Russia

    L. I. Lobkovsky, E. M. Chuvilin, D. A. Davletshina & N. E. Shakhova

  6. Center for Petroleum Science and Engineering, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, 121205, Moscow, Russia

    E. M. Chuvilin & D. A. Davletshina

  7. Il’ichev Pacific Oceanological Institute, Far East Branch, Russian Academy of Sciences, 690041, Vladivostok, Russia

    N. E. Shakhova

Authors
  1. M. M. Ramazanov
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  2. N. S. Bulgakova
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  3. L. I. Lobkovsky
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  4. E. M. Chuvilin
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  5. D. A. Davletshina
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  6. N. E. Shakhova
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Corresponding author

Correspondence to M. M. Ramazanov.

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Translated by L. Mukhortova

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Ramazanov, M.M., Bulgakova, N.S., Lobkovsky, L.I. et al. Dissociation Kinetics of Methane Hydrate in Frozen Rocks under Decreasing External Pressure: Mathematical and Experimental Modeling. Dokl. Earth Sc. (2024). https://doi.org/10.1134/S1028334X24601391

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  • DOI: https://doi.org/10.1134/S1028334X24601391

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