石油技術協会誌
Online ISSN : 1881-4131
Print ISSN : 0370-9868
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日本海東縁ガスハイドレート調査 (MD179) で得られた海底表層堆積物中の間隙水溶存ガス分析
八久保 晶弘柳川 勝紀戸丸 仁松本 良
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2012 年 77 巻 4 号 p. 268-273

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We investigated molecular and stable isotope compositions of dissolved gas in pore water in subsurface sediment cores that were retrieved from the eastern margin of Japan Sea during the MD179 cruise onboard R/V Marion Dufresne in June 2010. Hydrate-bearing sediment cores retrieved from Umitaka Spur in the Joetsu Basin showed high 13C concentrations of methane, indicating its thermogenic origin, whereas those at Joetsu Knoll partly contained microbial methane because 13C and deuterium are both depleted. Other sediment cores without gas hydrates showed mainly microbial methane formed via CO2 reduction. The profiles of methane and CO2 in the sediments showed a minimum concentration of 13C at SMI (sulfate-methane interface) depth. The concentration of methane in the sediments increased dramatically beneath the shallow SMI depth in the Joetsu Basin, indicating active microbial methane generation.

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© 2012 石油技術協会
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