| Shallow gas and focused fluid flow systems in the Pearl River Mouth Basin, northern South China Sea | |
| Sun, Qiliang1; Wu, Shiguo1; Cartwright, Joe2; Dong, Dongdong1; Sun, QL (reprint author), Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China. | |
| 2012-06-15 | |
| 发表期刊 | MARINE GEOLOGY
 |
| ISSN | 0025-3227 |
| 卷号 | 315页码:1-14 |
| 文章类型 | Article |
| 摘要 | Analysis of three-dimensional seismic data and multibeam data from the Pearl River Mouth Basin in the northern South China Sea, reveals numerous focused fluid flow features and associated widespread shallow gas from 500 m to 2000 m water depth. Shallow gas is usually indicated by acoustic anomalies, such as enhanced reflections, acoustic turbidity, and acoustic blanking. Two types of tectonically and stratigraphically controlled fluid flow related systems are identified. The first type can be observed in the deep strata, including gas chimneys, mud diapirs, mud volcanoes, pipes, and large normal faults, which are usually located over basement highs and are related to overpressure mainly caused by gas generation. The focused fluid flow structures serve as pathways for upward migration of thermogenic fluids from source rocks or gas reservoirs. The second type is a shallow fluid flow system consisting of minor normal faults, migrating canyons, mass transport deposits, contourite, and pockmarks. The minor faults and migrating canyons provide pathways for fluids of thermogenic origin transported by the deep fluid flow system and of biogenic origin generated in the shallow succession. The mass transport deposits and contourite mainly serve as caprock. Small-scale fluid seepage is observed at the modern seabed expressed as pockmarks located above shallow gas accumulations. The distribution of shallow gas is controlled by the combination of these two systems. The focused fluid flow features and shallow gas are poorly studied in the study area and we propose a 3D model of focused fluid flow and shallow gas distribution that can be used more widely in other passive and active continental margins. Our results are important to the understanding of resources (hydrocarbon and gas hydrate) exploration in such a petroliferous basin and they must be taken into account when assessing seabed stability. (C) 2012 Elsevier B.V. All rights reserved. |
| 关键词 | Focused Fluid Flow Systems Shallow Gas Gas Hydrate Mass Transport Deposits Fluid Migration Canyons South China Sea |
| 学科领域 | Geosciences, Multidisciplinary ; Oceanography |
| DOI | 10.1016/j.margeo.2012.05.003 |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000308061500001 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/12517 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Sun, QL (reprint author), Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China. |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China 2.Univ Cardiff, Basin Dynam Res Grp, Lab 3D, Cardiff CF10 3YE, S Glam, Wales |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Sun, Qiliang,Wu, Shiguo,Cartwright, Joe,et al. Shallow gas and focused fluid flow systems in the Pearl River Mouth Basin, northern South China Sea[J]. MARINE GEOLOGY,2012,315:1-14. |
| APA | Sun, Qiliang,Wu, Shiguo,Cartwright, Joe,Dong, Dongdong,&Sun, QL .(2012).Shallow gas and focused fluid flow systems in the Pearl River Mouth Basin, northern South China Sea.MARINE GEOLOGY,315,1-14. |
| MLA | Sun, Qiliang,et al."Shallow gas and focused fluid flow systems in the Pearl River Mouth Basin, northern South China Sea".MARINE GEOLOGY 315(2012):1-14. |
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