| Geological controls on the occurrence of recently formed highly concentrated gas hydrate accumulations in the Shenhu area, South China Sea | |
Jin, Jiapeng1,2,3,4,5; Wang, Xiujuan1,2,3,4,5; Guo, Yiqun6; Li, Jie7 ; Li, Yuanping7; Zhang, Xin1,2,5; Qian, Jin1,2,5; Sun, Luyi1,2,4
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| 2020-06-01 | |
| 发表期刊 | MARINE AND PETROLEUM GEOLOGY
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| ISSN | 0264-8172 |
| 卷号 | 116页码:16 |
| 通讯作者 | Wang, Xiujuan(wangxiujuan@qdio.ac.cn) |
| 摘要 | The Shenhu area is an important gas hydrate exploration and production test zone in the northern slope of South China Sea. A sediment layer with high gas hydrate saturations and abnormally high pore-water chlorinity concentrations has been identified from recently acquired logging-while-drilling (LWD) data and core samples. Data from four sites (W19, W18, SC-01 and SC-02) indicates that most gas hydrate-bearing sediments (GHBSs) form preferentially in low gamma ray log inferred coarser-grained units, except at SC-02. At this site, a striking increase in pore-water chlorinity values, with a maximum value exceeding 816 mM at a depth of 158 mbsf, indicates an active or recently-active system. A one-dimensional (1D) diffusion model is used to estimate the time when the gas hydrate formed based on the saturation, thickness, and porosity of gas hydrate-bearing units at each site. The results show that gas hydrates at sites SC-02 and W18 respectively formed 19-29 thousand and 26-28 thousand years ago (assuming a closed system). To further investigate the apparently young age of these highly saturated gas hydrate accumulations, three-dimensional (3D) seismic variance and frequency attributes extracted along different sedimentary layers are shown to provide evidence for vertical and lateral gas migration along normal faults and gas chimneys. The high pore-water chlorinities and evidence for fluid migration from deeper sedimentary sections suggest that upward migration of methane gas into the hydrate stability zone may have contributed to the recent formation of the highly concentrated gas hydrate occurrences identified in the Shenhu area. |
| 关键词 | High gas hydrate saturation Upward migration High pore-water chlorinity South China sea |
| DOI | 10.1016/j.marpetgeo.2020.104294 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | National Key R&D Program of China[2017YFC0307601] ; National Natural Science Foundation of China[41676041] ; National Natural Science Foundation of China[41676040] ; CAS Interdisciplinary Innovation team[JCTD-2018-12] ; National 863 Program[2013AA092601] |
| WOS研究方向 | Geology |
| WOS类目 | Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000528600100016 |
| 出版者 | ELSEVIER SCI LTD |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/167338 |
| 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, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 6.MNR, Guangzhou Marine Geol Survey, Guangzhou 510760, Peoples R China 7.CNOOC China Ltd, Shenzhen Branch, Shenzhen 518054, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所; 中国科学院海洋大科学研究中心 |
| 通讯作者单位 | 中国科学院海洋研究所; 中国科学院海洋大科学研究中心 |
| 推荐引用方式 GB/T 7714 | Jin, Jiapeng,Wang, Xiujuan,Guo, Yiqun,et al. Geological controls on the occurrence of recently formed highly concentrated gas hydrate accumulations in the Shenhu area, South China Sea[J]. MARINE AND PETROLEUM GEOLOGY,2020,116:16. |
| APA | Jin, Jiapeng.,Wang, Xiujuan.,Guo, Yiqun.,Li, Jie.,Li, Yuanping.,...&Sun, Luyi.(2020).Geological controls on the occurrence of recently formed highly concentrated gas hydrate accumulations in the Shenhu area, South China Sea.MARINE AND PETROLEUM GEOLOGY,116,16. |
| MLA | Jin, Jiapeng,et al."Geological controls on the occurrence of recently formed highly concentrated gas hydrate accumulations in the Shenhu area, South China Sea".MARINE AND PETROLEUM GEOLOGY 116(2020):16. |
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| Geological controls （9881KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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