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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ftdoajarticles:oai:doaj.org/article:1d1edbe73aab4d2099c961ddcd772e5a 2023-05-15T16:36:45+02:00 Formation and Accumulation of Pore Methane Hydrates in Permafrost: Experimental Modeling Evgeny Chuvilin Dinara Davletshina 2018-12-01T00:00:00Z https://doi.org/10.3390/geosciences8120467 https://doaj.org/article/1d1edbe73aab4d2099c961ddcd772e5a EN eng MDPI AG https://www.mdpi.com/2076-3263/8/12/467 https://doaj.org/toc/2076-3263 2076-3263 doi:10.3390/geosciences8120467 https://doaj.org/article/1d1edbe73aab4d2099c961ddcd772e5a Geosciences, Vol 8, Iss 12, p 467 (2018) gas hydrate permafrost methane hydrate formation kinetics hydrate saturation Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.3390/geosciences8120467 2022-12-31T12:29:34Z 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. Article in Journal/Newspaper Ice Methane hydrate permafrost Directory of Open Access Journals: DOAJ Articles Geosciences 8 12 467 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
gas hydrate permafrost methane hydrate formation kinetics hydrate saturation Geology QE1-996.5 |
spellingShingle |
gas hydrate permafrost methane hydrate formation kinetics hydrate saturation Geology QE1-996.5 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 Geology QE1-996.5 |
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 |
Article in Journal/Newspaper |
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 |
MDPI AG |
publishDate |
2018 |
url |
https://doi.org/10.3390/geosciences8120467 https://doaj.org/article/1d1edbe73aab4d2099c961ddcd772e5a |
genre |
Ice Methane hydrate permafrost |
genre_facet |
Ice Methane hydrate permafrost |
op_source |
Geosciences, Vol 8, Iss 12, p 467 (2018) |
op_relation |
https://www.mdpi.com/2076-3263/8/12/467 https://doaj.org/toc/2076-3263 2076-3263 doi:10.3390/geosciences8120467 https://doaj.org/article/1d1edbe73aab4d2099c961ddcd772e5a |
op_doi |
https://doi.org/10.3390/geosciences8120467 |
container_title |
Geosciences |
container_volume |
8 |
container_issue |
12 |
container_start_page |
467 |
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1766027076538728448 |