Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling
Favorable thermobaric conditions of hydrate formation and the significant accumulation of methane, ice, and actual data on the presence of gas hydrates in permafrost suggest the possibility of their formation in the pore space of frozen soils at negative temperatures. In addition, today there are se...
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ftmdpi:oai:mdpi.com:/2076-3263/8/12/467/ 2023-08-20T04:07:06+02:00 Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling Evgeny Chuvilin Dinara Davletshina agris 2018-12-10 application/pdf https://doi.org/10.3390/geosciences8120467 EN eng Multidisciplinary Digital Publishing Institute https://dx.doi.org/10.3390/geosciences8120467 https://creativecommons.org/licenses/by/4.0/ Geosciences; Volume 8; Issue 12; Pages: 467 gas hydrate permafrost methane hydrate formation kinetics hydrate saturation Text 2018 ftmdpi https://doi.org/10.3390/geosciences8120467 2023-07-31T21:53:50Z Favorable thermobaric conditions of hydrate formation and the significant accumulation of methane, ice, and actual data on the presence of gas hydrates in permafrost suggest the possibility of their formation in the pore space of frozen soils at negative temperatures. In addition, today there are several geological models that involve the formation of gas hydrate accumulations in permafrost. To confirm the literature data, the formation of gas hydrates in permafrost saturated with methane has been studied experimentally using natural artificially frozen in the laboratory sand and silt samples, on a specially designed system at temperatures from 0 to −8 °C. The experimental results confirm that pore methane hydrates can form in gas-bearing frozen soils. The kinetics of gas hydrate accumulation in frozen soils was investigated in terms of dependence on the temperature, excess pressure, initial ice content, salinity, and type of soil. The process of hydrate formation in soil samples in time with falling temperature from +2 °C to −8 °C slows down. The fraction of pore ice converted to hydrate increased as the gas pressure exceeded the equilibrium. The optimal ice saturation values (45−65%) at which hydrate accumulation in the porous media is highest were found. The hydrate accumulation is slower in finer-grained sediments and saline soils. The several geological models are presented to substantiate the processes of natural hydrate formation in permafrost at negative temperatures. Text Ice Methane hydrate permafrost MDPI Open Access Publishing Geosciences 8 12 467 |
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English |
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gas hydrate permafrost methane hydrate formation kinetics hydrate saturation |
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gas hydrate permafrost methane hydrate formation kinetics hydrate saturation Evgeny Chuvilin Dinara Davletshina Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling |
topic_facet |
gas hydrate permafrost methane hydrate formation kinetics hydrate saturation |
description |
Favorable thermobaric conditions of hydrate formation and the significant accumulation of methane, ice, and actual data on the presence of gas hydrates in permafrost suggest the possibility of their formation in the pore space of frozen soils at negative temperatures. In addition, today there are several geological models that involve the formation of gas hydrate accumulations in permafrost. To confirm the literature data, the formation of gas hydrates in permafrost saturated with methane has been studied experimentally using natural artificially frozen in the laboratory sand and silt samples, on a specially designed system at temperatures from 0 to −8 °C. The experimental results confirm that pore methane hydrates can form in gas-bearing frozen soils. The kinetics of gas hydrate accumulation in frozen soils was investigated in terms of dependence on the temperature, excess pressure, initial ice content, salinity, and type of soil. The process of hydrate formation in soil samples in time with falling temperature from +2 °C to −8 °C slows down. The fraction of pore ice converted to hydrate increased as the gas pressure exceeded the equilibrium. The optimal ice saturation values (45−65%) at which hydrate accumulation in the porous media is highest were found. The hydrate accumulation is slower in finer-grained sediments and saline soils. The several geological models are presented to substantiate the processes of natural hydrate formation in permafrost at negative temperatures. |
format |
Text |
author |
Evgeny Chuvilin Dinara Davletshina |
author_facet |
Evgeny Chuvilin Dinara Davletshina |
author_sort |
Evgeny Chuvilin |
title |
Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling |
title_short |
Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling |
title_full |
Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling |
title_fullStr |
Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling |
title_full_unstemmed |
Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling |
title_sort |
formation and accumulation of pore methane hydrates in permafrost: experimental modeling |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2018 |
url |
https://doi.org/10.3390/geosciences8120467 |
op_coverage |
agris |
genre |
Ice Methane hydrate permafrost |
genre_facet |
Ice Methane hydrate permafrost |
op_source |
Geosciences; Volume 8; Issue 12; Pages: 467 |
op_relation |
https://dx.doi.org/10.3390/geosciences8120467 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/geosciences8120467 |
container_title |
Geosciences |
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8 |
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12 |
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467 |
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