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首页> 外文期刊>Journal of Asian earth sciences >Formation of pockmarks and submarine canyons associated with dissociation of gas hydrates on the Joetsu Knoll, eastern margin of the Sea of Japan
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Formation of pockmarks and submarine canyons associated with dissociation of gas hydrates on the Joetsu Knoll, eastern margin of the Sea of Japan

机译：在日本海东部边缘的上越丘陵上形成的与天然气水合物分解相关的麻点和海底峡谷

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摘要

This study, based on 3.5 kHz SBP, 3D seismic data and long piston cores obtained during MD179 cruise, elucidated the timing and causes of pockmark and submarine canyon formation on the Joetsu Knoll in the eastern margin of the Sea of Japan. Gas hydrate mounds and pockmarks aligned parallel to the axis on the top of the Joetsu Knoll are associated with gas chimneys, pull-up structures, faults, and multiple bottom-simulating reflectors (BSRs), suggesting that thermogenic gas migrated upward through gas chimneys and faults from deep hydrocarbon sources and reservoirs. Seismic and core data suggest that submarine canyons on the western slope of the Joetsu Knoll were formed by turbidity currents generated by sand and mud ejection from pockmarks on the knoll. The pockmark and canyon formation probably commenced during the sea-level fall, lasting until transgression stages. Subsequently, hydropressure release during the sea level lowering might have instigated dissociation of the gas hydrate around the base of the gas hydrate, leading to generation and migration of large volumes of methane gas to the seafloor. Accumulation of hydrate caps below mounds eventually caused the collapse of the mounds and the formation of large depressions (pockmarks) along with ejection of sand and mud out of the pockmarks, thereby generating turbidity currents. Prolonged pockmark and submarine canyon activities might have persisted until the transgression stage because of time lags from gas hydrate dissociation around the base of the gas hydrate until upward migration to the seafloor. This study revealed the possibility that submarine canyons were formed by pockmark activities. If that process occurred, it would present important implications for reconstructing the long-term history of shallow gas hydrate activity based on submarine canyon development.
机译：这项研究基于3.5 kHz SBP，3D地震数据和MD179巡航期间获得的长活塞芯，阐明了日本海东缘上越山丘上形成麻子和海底峡谷的时间和成因。平行于上越丘陵顶部轴线对齐的天然气水合物丘和麻点与天然气烟囱，上拉结构，断层和多个底部模拟反射器（BSR）有关，表明热成因气体通过天然气烟囱向上迁移。深层烃源和储层的断层。地震和岩心数据表明，上越丘陵西坡上的海底峡谷是由从丘陵上的麻点喷出的沙子和泥浆所产生的浊流形成的。麻点和峡谷的形成可能始于海平面下降，一直持续到海侵阶段。随后，海平面下降期间的水压释放可能促使天然气水合物基部周围的天然气水合物解离，从而导致大量甲烷气体的产生和迁移到海底。土墩下水合物盖的积累最终导致土墩坍塌并形成大的凹陷（麻点），同时沙子和泥浆从麻点中喷出，从而产生浑浊的水流。延长的麻点和海底峡谷活动可能一直持续到海侵阶段，因为从天然气水合物底部周围的天然气水合物解离到向上迁移到海底的时间滞后。这项研究揭示了麻子活动形成海底峡谷的可能性。如果这一过程发生，它将对根据海底峡谷发展重建浅层天然气水合物活动的长期历史具有重要意义。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第15期|228-242|共15页
  • 作者

    Takeshi Nakajima; Yoshitaka Kakuwa; Yukihito Yasudomi; Takuya Itaki; Isao Motoyama; Takayuki Tomiyama; Hideaki Machiyama; Hajime Katayama; Osamu Okitsu; Sumito Morita; Manabu Tanahashi; Ryo Matsumoto;

  • 作者单位

    Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan;

    Department of Earth Science and Astronomy, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan;

    Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba, Ibaraki 305-8572, Japan;

    Institute of Geology ad Geoinformation, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan;

    Department of Earth and Environmental Sciences, Faculty of Science, Yamagata University, 1-4-12, Koshirakawa-cho, Yamagata, Yamagata 990-8560, Japan;

    Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth-Science and Technology, 200 Otsu, Mononobe. Nangoku, Kochi 783-8502, Japan;

    Exploration Research Promotion Group, Japan Agency for Marine-Earth-Science and Technology, 2-15, Natsushima-cho, Yokosuka, Kanagawa 237-0061, Japan;

    Institute of Geology ad Geoinformation, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan;

    Exploration & Production Technology Department, JX Nippon Oil & Gas Exploration Corporation, 6-3, Otemachi 2-chome, Chiyoda-ku, Tokyo 100-8163, Japan;

    Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan;

    Institute for Geo-Resources and Environment, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan;

    Gas Hydrate Laboratory, Organization for the Strategic Coordinator of Research and Intellectual Properties, Meiji University, 2-1 Kanda Surugadai, Chiyodaku, Tokyo 101-8301,Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gas hydrate; Pockmark; Submarine canyon; Sea of Japan; Turbidity current;

    机译：天然气水合物;麻子;海底峡谷;日本海浊流;

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