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Decomposition of methane hydrates in sand, sandstone, clays and glass beads

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タイトル: Decomposition of methane hydrates in sand, sandstone, clays and glass beads
著者: Uchida, Tsutomu 著作を一覧する
Takeya, Satoshi 著作を一覧する
Chuvilin, Evgene M. 著作を一覧する
Ohmura, Ryo 著作を一覧する
Nagao, Jiro 著作を一覧する
Yakushev, Vladimir S. 著作を一覧する
Istomin, Vladimir A. 著作を一覧する
Minagawa, Hideki 著作を一覧する
Ebinuma, Takao 著作を一覧する
Narita, Hideo 著作を一覧する
キーワード: Methane hydrate
decomposition temperature shift
natural sediment
artificial fine particle
pore space distribution
water content
発行日: 2004年 5月11日
出版者: American Geophysical Union (AGU)
誌名: Journal of Geophysical Research - Solid Earth (Chemistry and Physics of Minerals and Rocks/Volcanology)
巻: 109
号: B5
出版社 DOI: 10.1029/2003JB002771
抄録: 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.
記述: An edited version of this paper was published by AGU. Copyright 2004 American Geophysical Union.
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 内田 努


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