Characteristics of shallow gas hydrate in Okhotsk Sea
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-sona...
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ftchinacasciocas:oai:ir.qdio.ac.cn:337002/163531 2023-05-15T17:52:37+02:00 Characteristics of shallow gas hydrate in Okhotsk Sea LUAN XiWu JIN YoungKeun Anatoly OBZHIROV YUE BaoJing 2008-01-01 http://ir.qdio.ac.cn/handle/337002/163531 英语 eng Science in China. Series D: Earth Sciences http://ir.qdio.ac.cn/handle/337002/163531 期刊论文 2008 ftchinacasciocas 2022-06-27T05:41:24Z 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. Report okhotsk sea Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR Okhotsk |
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Open Polar |
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Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR |
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ftchinacasciocas |
language |
English |
description |
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. |
format |
Report |
author |
LUAN XiWu JIN YoungKeun Anatoly OBZHIROV YUE BaoJing |
spellingShingle |
LUAN XiWu JIN YoungKeun Anatoly OBZHIROV YUE BaoJing Characteristics of shallow gas hydrate in Okhotsk Sea |
author_facet |
LUAN XiWu JIN YoungKeun Anatoly OBZHIROV YUE BaoJing |
author_sort |
LUAN XiWu |
title |
Characteristics of shallow gas hydrate in Okhotsk Sea |
title_short |
Characteristics of shallow gas hydrate in Okhotsk Sea |
title_full |
Characteristics of shallow gas hydrate in Okhotsk Sea |
title_fullStr |
Characteristics of shallow gas hydrate in Okhotsk Sea |
title_full_unstemmed |
Characteristics of shallow gas hydrate in Okhotsk Sea |
title_sort |
characteristics of shallow gas hydrate in okhotsk sea |
publishDate |
2008 |
url |
http://ir.qdio.ac.cn/handle/337002/163531 |
geographic |
Okhotsk |
geographic_facet |
Okhotsk |
genre |
okhotsk sea |
genre_facet |
okhotsk sea |
op_relation |
Science in China. Series D: Earth Sciences http://ir.qdio.ac.cn/handle/337002/163531 |
_version_ |
1766160291628843008 |