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Characteristics of shallow gas hydrate in Okhotsk Sea

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Abstract

Multidisciplinary field investigations were carried out in Okhotsk Sea by R/V Akademik M.A. Lavrentyev (LV) of the Russian Academy of Sciences (RAS) in May 2006, supported by funding agencies from Korea, Russia, Japan and China. Geophysical data including echo-sounder, bottom profile, side-scan-sonar, and gravity core sample were obtained aimed to understand the characteristics and formation mechanism of shallow gas hydrates. Based on the geophysical data, we found that the methane flare detected by echo-sounder was the evidence of free gas in the sediment, while the dome structure detected by side-scan sonar and bottom profile was the root of gas venting. Gas hydrate retrieved from core on top of the dome structure which was interbedded as thin lamination or lenses with thickness varying from a few millimeters to 3 cm. Gas hydrate content in hydrate-bearing intervals visually amounted to 5%–30% of the sediment volume. This paper argued that gases in the sediment core were not all from gas hydrate decomposition during the gravity core lifting process, free gases must existed in the gas hydrate stability zone, and tectonic structure like dome structure in this paper was free gas central, gas hydrate formed only when gases over-saturated in this gas central, away from these structures, gas hydrate could not form due to low gas concentration.

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Authors and Affiliations

  1. Key Lab of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China

    Luan XiWu & Yue BaoJing

  2. Korea Polar Research Institute, KORDI, Incheon, 406-840, Korea

    Jin YoungKeun

  3. V.I. Il’ichev Pacific Oceanological Institute of the Far Eastern Branch of Russian Academy of Sciences, Vladivostok, 690041, Russia

    Anatoly Obzhirov

Authors
  1. Luan XiWu
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  2. Jin YoungKeun
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  3. Anatoly Obzhirov
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  4. Yue BaoJing
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Correspondence to Luan XiWu.

Additional information

Supported by Korean MOMAF Program (Grant No. PM06020), Key Discipline Program of Chinese Academy of Sciences (Grant No. KZCX2-211-01), High Technology Research and Development Program of China (Grant No. 2006AA09Z234), and National Natural Science Foundation of China (Grant No. 40776032)

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Luan, X., Jin, Y., Obzhirov, A. et al. Characteristics of shallow gas hydrate in Okhotsk Sea. Sci. China Ser. D-Earth Sci. 51, 415–421 (2008). https://doi.org/10.1007/s11430-008-0018-3

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  • DOI: https://doi.org/10.1007/s11430-008-0018-3

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