オホーツク海のメタンハイドレートとプルーム Methane Hydrates and Plumes in the Sea of Okhotsk

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著者

    • 庄子 仁 SHOJI Hitoshi
    • 北見工業大学未利用エネルギー研究センター New Energy Resources Research Center, Kitami Institute of Technology
    • Jin Young K. JIN Young K.
    • 韓国海洋研究開発研究所韓国極地研究所 Korea Polar Research Institute, Korea Ocean Research and Development Institute
    • SALOMATIN Alexander
    • ロシア科学アカデミー極東支部V.I.イリチェフ太平洋海洋学研究所 V.I. Il'ichev Pacific Oceanological Institute FEB RAS
    • BARANOV Boris
    • ロシア科学アカデミーP.P.シルショフ海洋学研究所 P.P. Shirshov Institute of Oceanology RAS
    • GLADYSH Vyacheslav
    • ロシア地質学海洋鉱物資源研究所 Russia Research Institute for Geology and Mineral Resources of the Ocean
    • 南 尚嗣 MINAMI Hirotsugu
    • 北見工業大学未利用エネルギー研究センター New Energy Resources Research Center, Kitami Institute of Technology
    • 山下 総 YAMASHITA Satoshi
    • 北見工業大学未利用エネルギー研究センター New Energy Resources Research Center, Kitami Institute of Technology
    • 高橋 信夫 TAKAHASHI Nobuo
    • 北見工業大学未利用エネルギー研究センター New Energy Resources Research Center, Kitami Institute of Technology

抄録

 Methane hydrates exist beneath the sea bottom near cold seeps NE off the Sakhalin in the Sea of Okhotsk. Multidisciplinary field operations were performed at a study area (approximately 16 × 20 km<sup>2</sup>) to investigate seepage characteristics and understand gas hydrate formation mechanisms. A continuous profiling survey was conducted to obtain a distribution map of seepage structures on the floor by using a deep-tow, side-scan-sonar equipment. The distribution map reveals that the dense area of seepage structures coincides with a sea-floor area of deformed sediments caused possibly by repeated sediment slumping and debris flows in the past. We speculate that this deformation may have created shallow faults that are suitable to conduits for the migration and discharge of gas and fluid.<br> Three seepage structures were selected to study about their fluid-seep conditions around the sea floor level. Hieroglyph seepage structure is located at the northern end of the dense area of the structures. Kitami and Chaos structures are located about 2 and 7 km respectively apart from the Hieroglyph structure within the dense area. Large plumes on echograms and higher methane contents in the water column confirm gas seepage activities at the three structures. There observed at least two and four plumes at the Hieroglyph and Chaos structures, respectively. Each gas chimney image in seismic reflection profiles was traced to connect each BSR and seepage structure. Both pull-up and disturbed structures of BSR around the gas chimney images were interpreted as to be indications of significant heat flows caused by ascending fluid at both Kitami and Chaos structures. On the other hand, almost no pull-up/disturbance of BSR was observed at the Hieroglyph structure, suggesting little water seepage.<br> The seep activity may vary with time off the Sakhalin. The Hieroglyph structure is located at the edge of a dense area of the seepage structures. It might serve as an indicator for the long-term activity of the fluid seepage system off the Sakhalin.

収録刊行物

  • 地學雜誌

    地學雜誌 118(1), 175-193, 2009-03-25

    公益社団法人 東京地学協会

参考文献:  35件中 1-35件 を表示

被引用文献:  5件中 1-5件 を表示

各種コード

  • NII論文ID(NAID)
    10030365016
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    0022135X
  • NDL 記事登録ID
    10232799
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  IR  J-STAGE 
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