| Characteristics of shallow gas hydrate in Okhotsk Sea | |
| XiWu, Luan1; YoungKeun, Jin2; Obzhirov, Anatoly3; BaoJing, Yue1 | |
| 2008-03-01 | |
| 发表期刊 | SCIENCE IN CHINA SERIES D-EARTH SCIENCES
 |
| ISSN | 1006-9313 |
| 卷号 | 51期号:3页码:415-421 |
| 文章类型 | Article |
| 摘要 | 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.; 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. |
| 关键词 | Okhotsk Sea Shallow Gas Hydrates Free Gas Dome Structure |
| 学科领域 | Geosciences, Multidisciplinary |
| DOI | 10.1007/s11430-008-0018-3 |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000253527000010 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/5052 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.KORDI, Korea Polar Res Inst, Inchon 406840, South Korea 3.Russian Acad Sci, Far Eastern Branch, VI Ilichev Pacific Oceanol Inst, Vladivostok 690041, Russia |
| 推荐引用方式 GB/T 7714 | XiWu, Luan,YoungKeun, Jin,Obzhirov, Anatoly,et al. Characteristics of shallow gas hydrate in Okhotsk Sea[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2008,51(3):415-421. |
| APA | XiWu, Luan,YoungKeun, Jin,Obzhirov, Anatoly,&BaoJing, Yue.(2008).Characteristics of shallow gas hydrate in Okhotsk Sea.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,51(3),415-421. |
| MLA | XiWu, Luan,et al."Characteristics of shallow gas hydrate in Okhotsk Sea".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 51.3(2008):415-421. |
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