| Geophysical evidence for gas hydrate accumulation related to methane seepage in the Taixinan Basin, South China Sea | |
Wang, Xiujuan1,2,3; Liu, Bo1,2,4; Qian, Jin1,2,3; Zhang, Xin1,2; Guo, Yiqun5; Su, Pibo5; Liang, Jinqiang5; Jin, Jiapeng1,2,4; Luan, Zhendong1,2; Chen, Duanxin1,2,3; Xi, Shichuan1,2,4; Li, Chaolun1,2
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| 2018-12-01 | |
| 发表期刊 | JOURNAL OF ASIAN EARTH SCIENCES
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| ISSN | 1367-9120 |
| 卷号 | 168页码:27-37 |
| 通讯作者 | Wang, Xiujuan(wangxiujuan@qdio.ac.cn) |
| 摘要 | Seafloor features, seismic amplitude anomaly, geophysical attributes, and chemosynthetic community are different in the methane seepage areas of Taixinan Basin, South China Sea. We integrate the new acquired seafloor images with seismic data to present the differences of three cold seeps which are associated with fluid flows. These three cold seeps include two inactive sites (CS02-8 and CS02-9) and one active site (Site F). At site CS02-8 area, the seafloor carbonate and buried carbonate layer are identified from core samples at Site GMGS2-08. BSR is interrupted by the upward migration of fluids from the base of gas hydrate stability zone (BGHSZ) and gas hydrate-bearing sediments show pull-up seismic reflections below the buried carbonate layer. At site CS02-9 area, near seafloor carbonate was found at hole GMGS2-09B where a 62 m-high pinnacle and gas hydrate were also found from the core samples. The LWD data at hole 09A indicate that free gas is present below the depth of 64 m without gas hydrate. The average saturations of free gas estimated from P-wave velocity are about 3% with a patchy distribution and 0.3% with homogenous distribution respectively, which is accord with the enhanced reflection below BGHSZ. At Site F area, the exposed gas hydrate, carbonate and flourishing chemosynthetic communities are detected using ROV with a high amplitude seismic reflection at seafloor. The BSR is interrupted by a chimney structure from the seismic data which indicates that the fluids are migrating vertically and rise to the seafloor as gas bubbles. The geophysical evidence at these three seep sites show that pore-filling gas hydrates with saturations ranging from 10% to 40% are widely distributed above the BSR. However, massive or vein gas hydrates only occur around cold seeps. |
| 关键词 | Methane seepage Gas hydrate Free gas Saturation Fluid flow Taixinan Basin |
| DOI | 10.1016/j.jseaes.2017.11.011 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | Chinese Academy of Sciences' Strategic Priority Research Program, CAS[XDA11030102] ; China Geological Survey Project for South China Sea Gas Hydrate Exploration of GMGS[DD20160211] ; National Natural Science Foundation of China[41676041] ; National Natural Science Foundation of China[41676040] ; Chinese Academy of Sciences' Strategic Priority Research Program, CAS[XDA11030102] ; China Geological Survey Project for South China Sea Gas Hydrate Exploration of GMGS[DD20160211] ; National Natural Science Foundation of China[41676041] ; National Natural Science Foundation of China[41676040] |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000452945000004 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/155799 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Wang, Xiujuan |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266061, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Guangzhou Marine Geol Survey, MLR, Guangzhou 510760, Guangdong, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 通讯作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Wang, Xiujuan,Liu, Bo,Qian, Jin,et al. Geophysical evidence for gas hydrate accumulation related to methane seepage in the Taixinan Basin, South China Sea[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,168:27-37. |
| APA | Wang, Xiujuan.,Liu, Bo.,Qian, Jin.,Zhang, Xin.,Guo, Yiqun.,...&Li, Chaolun.(2018).Geophysical evidence for gas hydrate accumulation related to methane seepage in the Taixinan Basin, South China Sea.JOURNAL OF ASIAN EARTH SCIENCES,168,27-37. |
| MLA | Wang, Xiujuan,et al."Geophysical evidence for gas hydrate accumulation related to methane seepage in the Taixinan Basin, South China Sea".JOURNAL OF ASIAN EARTH SCIENCES 168(2018):27-37. |
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| Geophysical evidence（3166KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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