Gas hydrates associated with gas chimneys in fine-grained sediments of the northern South China Sea
文献类型：期刊论文
| 作者 | Sun, Yunbao1,2; Wu, Shiguo1; Dong, Dongdong1; Ludmann, Thomas3; Gong, Yuehua4 |
| 刊名 | MARINE GEOLOGY
 |
| 出版日期 | 2012-05-15 |
| 卷号 | 311页码:32-40 |
| 关键词 | gas chimney gas hydrate system fine-grained sediment South China Sea |
| ISSN号 | 0025-3227 |
| 通讯作者 | Wu, SG (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, 7 Nanhai Rd, Qingdao 266071, Peoples R China. |
| 英文摘要 | Drilling for gas hydrates at the northern continental margin of the South China Sea (SCS) provides a unique insight into the formation of the gas hydrate system in fine-grained sediments, even though most high concentrations of hydrates are found in coarse sediments. Detailed studies of 3D seismic data from a deep-water basin (Baiyun Depression) of this region reveal the presence of overpressured fluid flow, mostly manifested in gas chimneys. Gas chimneys are commonly characterized by disrupted reflections (DR), dim amplitude anomalies (DA), and enhanced reflections (ER) on conventional seismic profiles. Gas chimneys are also characterized by chaotic, low-continuity and low-frequency on instantaneous frequency and instantaneous amplitude profiles. Gas hydrates and a prominent BSR were discovered in the region of gas chimney occurrence. Logging data and sample analyses from drill holes over the chimney structures indicate close relationships between active fluid flow and the formation and accumulation of gas hydrates. Our results document that gas chimneys consisting of a connected network of fractures provide a passageway along which fluids ascend beneath the gas hydrate stability zone (GHSZ) for hydrate formation in fine-grained sediments of the northern South China Sea. Fluids accumulate in uppermost part of the slope where they are trapped beneath the prograding submarine delta sequence, which is not permeable enough for fluids to migrate through. Gas-charged fluids may originate from deep-seated hydrocarbon reservoirs, which are indicated by the molecular and isotopic signatures of gases in gas hydrates occurrence zone. We suppose that the fractures extend into the GHSZ, creating a space for hydrate condensation in the fine-grained sediments of the slope. Gas chimneys may account for the overpressured fluid activity and, most likely, the gas hydrate enrichment in the northern SCS. (C) 2012 Elsevier B.V. All rights reserved. |
| 学科主题 | Geosciences, Multidisciplinary ; Oceanography |
| 收录类别 | SCI |
| 原文出处 | 10.1016/j.margeo.2012.04.003 |
| 语种 | 英语 |
| WOS记录号 | WOS:000306035200003 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/12502]  |
| 专题 | 海洋研究所_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.Qingdao Inst Marine Geol, Minist Land & Resources, Key Lab Marine Hydrocarbon Resources & Environm G, Qingdao 266071, Peoples R China 3.Univ Hamburg, Inst Biogeochem & Marine Chem, D-20146 Hamburg, Germany 4.MLR, Guangzhou Marine Geol Survey, Guangzhou 510760, Guangdong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, Yunbao,Wu, Shiguo,Dong, Dongdong,et al. Gas hydrates associated with gas chimneys in fine-grained sediments of the northern South China Sea[J]. MARINE GEOLOGY,2012,311:32-40. |
| APA | Sun, Yunbao,Wu, Shiguo,Dong, Dongdong,Ludmann, Thomas,&Gong, Yuehua.(2012).Gas hydrates associated with gas chimneys in fine-grained sediments of the northern South China Sea.MARINE GEOLOGY,311,32-40. |
| MLA | Sun, Yunbao,et al."Gas hydrates associated with gas chimneys in fine-grained sediments of the northern South China Sea".MARINE GEOLOGY 311(2012):32-40. |
入库方式： OAI收割
来源：海洋研究所
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