Decomposition of methane hydrates in sand, sandstone, clays and glass beads
Decomposition conditions of methane hydrates in sediments were measured during formation-decomposition cycles. As test sediments, we used silica sand, sandstone, and clays (kaoline and bentonite), which are typical natural materials known as hydrate bearing sediments, and the range of samples cover...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/436 2023-05-15T17:12:09+02:00 Decomposition of methane hydrates in sand, sandstone, clays and glass beads Uchida, Tsutomu Takeya, Satoshi Chuvilin, Evgene M. Ohmura, Ryo Nagao, Jiro Yakushev, Vladimir S. Istomin, Vladimir A. Minagawa, Hideki Ebinuma, Takao Narita, Hideo http://hdl.handle.net/2115/436 https://doi.org/10.1029/2003JB002771 eng eng American Geophysical Union (AGU) http://hdl.handle.net/2115/436 Journal of Geophysical Research - Solid Earth (Chemistry and Physics of Minerals and Rocks/Volcanology), 109(B5): B05206 http://dx.doi.org/10.1029/2003JB002771 Methane hydrate decomposition temperature shift natural sediment artificial fine particle pore space distribution water content 459 article (author version) fthokunivhus https://doi.org/10.1029/2003JB002771 2022-11-18T01:01:10Z Decomposition conditions of methane hydrates in sediments were measured during formation-decomposition cycles. As test sediments, we used silica sand, sandstone, and clays (kaoline and bentonite), which are typical natural materials known as hydrate bearing sediments, and the range of samples cover a range of water saturating abilities. To better understand the results, we also used uniformly sized glass beads. Pore effects on decomposition of these materials were investigated by analyzing the pore-space distributions of the materials and by varying the initial water content of the samples. The results obtained for sand and sandstone samples indicated that the final decomposition temperatures were shifted lower than those for bulk hydrates at the same pressure. Temperature shifts were more negative for smaller initial water contents with the maximum shift being approximately -0.5 K. The results were consistent with those measured for glass beads with nearly the same particle size. For kaoline clays, the shift was at most -1.5 K. We conclude that the decomposition conditions are mainly affected by the pore sizes. The surface textures and mineral components had less influence on the results. We confirmed that glass beads mimic the effect of sediments for sand, sandstone, and kaoline clays, which have little-to-no swelling when put in contact with water. On the other hand, for bentonite particles, the results indicated that methane hydrates formed not only between the particles but also in the interlayers. A thermodynamic promoting effect was found for dilute bentonite solutions, although the positive decomposition-temperature shift was at most +0.5 K. An edited version of this paper was published by AGU. Copyright 2004 American Geophysical Union. Article in Journal/Newspaper Methane hydrate Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Journal of Geophysical Research: Solid Earth 109 B5 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Methane hydrate decomposition temperature shift natural sediment artificial fine particle pore space distribution water content 459 |
spellingShingle |
Methane hydrate decomposition temperature shift natural sediment artificial fine particle pore space distribution water content 459 Uchida, Tsutomu Takeya, Satoshi Chuvilin, Evgene M. Ohmura, Ryo Nagao, Jiro Yakushev, Vladimir S. Istomin, Vladimir A. Minagawa, Hideki Ebinuma, Takao Narita, Hideo Decomposition of methane hydrates in sand, sandstone, clays and glass beads |
topic_facet |
Methane hydrate decomposition temperature shift natural sediment artificial fine particle pore space distribution water content 459 |
description |
Decomposition conditions of methane hydrates in sediments were measured during formation-decomposition cycles. As test sediments, we used silica sand, sandstone, and clays (kaoline and bentonite), which are typical natural materials known as hydrate bearing sediments, and the range of samples cover a range of water saturating abilities. To better understand the results, we also used uniformly sized glass beads. Pore effects on decomposition of these materials were investigated by analyzing the pore-space distributions of the materials and by varying the initial water content of the samples. The results obtained for sand and sandstone samples indicated that the final decomposition temperatures were shifted lower than those for bulk hydrates at the same pressure. Temperature shifts were more negative for smaller initial water contents with the maximum shift being approximately -0.5 K. The results were consistent with those measured for glass beads with nearly the same particle size. For kaoline clays, the shift was at most -1.5 K. We conclude that the decomposition conditions are mainly affected by the pore sizes. The surface textures and mineral components had less influence on the results. We confirmed that glass beads mimic the effect of sediments for sand, sandstone, and kaoline clays, which have little-to-no swelling when put in contact with water. On the other hand, for bentonite particles, the results indicated that methane hydrates formed not only between the particles but also in the interlayers. A thermodynamic promoting effect was found for dilute bentonite solutions, although the positive decomposition-temperature shift was at most +0.5 K. An edited version of this paper was published by AGU. Copyright 2004 American Geophysical Union. |
format |
Article in Journal/Newspaper |
author |
Uchida, Tsutomu Takeya, Satoshi Chuvilin, Evgene M. Ohmura, Ryo Nagao, Jiro Yakushev, Vladimir S. Istomin, Vladimir A. Minagawa, Hideki Ebinuma, Takao Narita, Hideo |
author_facet |
Uchida, Tsutomu Takeya, Satoshi Chuvilin, Evgene M. Ohmura, Ryo Nagao, Jiro Yakushev, Vladimir S. Istomin, Vladimir A. Minagawa, Hideki Ebinuma, Takao Narita, Hideo |
author_sort |
Uchida, Tsutomu |
title |
Decomposition of methane hydrates in sand, sandstone, clays and glass beads |
title_short |
Decomposition of methane hydrates in sand, sandstone, clays and glass beads |
title_full |
Decomposition of methane hydrates in sand, sandstone, clays and glass beads |
title_fullStr |
Decomposition of methane hydrates in sand, sandstone, clays and glass beads |
title_full_unstemmed |
Decomposition of methane hydrates in sand, sandstone, clays and glass beads |
title_sort |
decomposition of methane hydrates in sand, sandstone, clays and glass beads |
publisher |
American Geophysical Union (AGU) |
url |
http://hdl.handle.net/2115/436 https://doi.org/10.1029/2003JB002771 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
http://hdl.handle.net/2115/436 Journal of Geophysical Research - Solid Earth (Chemistry and Physics of Minerals and Rocks/Volcanology), 109(B5): B05206 http://dx.doi.org/10.1029/2003JB002771 |
op_doi |
https://doi.org/10.1029/2003JB002771 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
109 |
container_issue |
B5 |
_version_ |
1766068926086643712 |