CO<sub>2</sub> emission and shallow-type methane hydrate decomposition experiment on deep-sea floor

DOI IR Web Site 1 Citations 9 References
  • Ohtomo Yoko
    Geomicrobiology Group, Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Geobio-Engineering and Technology Group, Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Ijiri Akira
    Geomicrobiology Group, Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Geobio-Engineering and Technology Group, Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Morono Yuki
    Geomicrobiology Group, Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Geobio-Engineering and Technology Group, Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Ikegawa Yojiro
    Geobio-Engineering and Technology Group, Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Central Research Institute of Electric Power industry
  • Suenaga Hiroshi
    Central Research Institute of Electric Power industry
  • Case David
    Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
  • Machiyama Hideaki
    Exploration Research Group, Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Yamamoto Fujio
    Exploration Research Group, Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Goto Shusaku
    Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology
  • Fukuba Tatsuhiro
    Marine Technology and Engineering Center (MARITEC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Nagasawa Makoto
    Syn Corporation Ltd.
  • Matsumoto Masamitsu
    Syn Corporation Ltd.
  • Inagaki Fumio
    Geomicrobiology Group, Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Geobio-Engineering and Technology Group, Research and Development (R&D) Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

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Other Title
  • 深海底におけるCO<sub>2</sub>排出及び表層型塊状メタンハイドレート分解実験
  • CO2 emission and shallow-type methane hydrate decomposition experiment on deep-sea floor

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Increasing anthropogenic CO2 in the atmosphere causes global warming and subsequent environmental changes, which may lead to an increase in natural disasters jeopardizing human society. Prompt technological development for CO2 capture and sequestration is required in the international community. In this study, we performed CO2 emission and shallow-type methane hydrate decomposition experiments at the Joetsu Knoll, offshore Joetsu, Niigata, Japan, as pilot studies to test feasibility of CO2 sequestration and methane recovery using methane-CO2 replacement in shallow-type methane hydrates. An isobaric cylinder pump and probe with a built-in heater (“Heat sonde”) were developed to inject CO2 in deep-sea, high-pressure conditions. Before injecting CO2 into a methane hydrate located in deep-sea sediments, we attempted CO2 emission directly into deep-seafloor. In the experiment, liquid CO2 was emitted at the head of Heat sonde, however, the isobaric cylinder pump became clogged during operation. The result reveals that precipitates of CO2 hydrate, which are generated during mixing of inflow seawater and outflow liquid CO2, blocked flow lines of the isobaric cylinder pump and Heat sonde. This suggests that our developed instruments must be improved for future work. We also observed the collapse of an exposed methane hydrate layer at the seafloor upon contact with the Heat sonde in our experiment.

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