| Geological controls on the occurrence of gas hydrate from core, downhole log, and seismic data in the Shenhu area, South China Sea | |
| Wang, Xiujuan1; Collett, Timothy S.2; Lee, Myung W.2; Yang, Shengxiong3; Guo, Yiqun3; Wu, Shiguo1; Wang, XJ (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China. | |
| 2014-11-01 | |
| 发表期刊 | MARINE GEOLOGY
 |
| 卷号 | 357页码:272-292 |
| 文章类型 | Article |
| 摘要 | Multi-channel seismic reflection data, well logs, and recovered sediment cores have been used in this study to characterize the geologic controls on the occurrence of gas hydrate in the Shenhu area of the South China Sea. The concept of the "gas hydrate petroleum system" has allowed for the systematic analysis of the impact of gas source, geologic controls on gas migration, and the role of the host sediment in the formation and stability of gas hydrates as encountered during the 2007 Guangzhou Marine Geological Survey Gas Hydrate Expedition (GMGS-1) in the Shenhu area. Analysis of seismic and bathymetric data identified seventeen sub-linear, nearparallel submarine canyons in this area. These canyons, formed in the Miocene, migrated in a northeasterly direction, and resulted in the burial and abandonment of canyons partially filled by coarse-grained sediments. Downhole wireline log (DWL) data were acquired from eight drill sites and sediment coring was conducted at five of these sites, which revealed the presence of suitable reservoirs for the occurrence of concentrated gas hydrate accumulations. Gas hydrate-bearing sediment layers were identified from well log and core data at three sites mainly within silt and silt clay sediments. Gas hydrate was also discovered in a sand reservoir at one site as inferred from the analysis of the DWL data. Seismic anomalies attributed to the presence of gas below the base of gas hydrate stability zone, provided direct evidence for the migration of gas into the overlying gas hydrate-bearing sedimentary sections. Geochemical analyses of gas samples collected from cores confirmed that the occurrence of gas hydrate in the Shenhu area is controlled by the presence thermogenic methane gas that has migrated into the gas hydrate stability zone from a more deeply buried source. (C) 2014 Elsevier B.V. All rights reserved. |
| 关键词 | Gas Hydrate Coarse-grained Thermogenic Geologic Controls South China Sea |
| 学科领域 | Geology ; Oceanography |
| DOI | 10.1016/j.margeo.2014.09.040 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000346542700021 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/23818 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Wang, XJ (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China. |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.US Geol Survey, Denver Fed Ctr, Denver, CO 80225 USA 3.Guangzhou Marine Geol Survey, MLR, Guangzhou 510075, Guangdong, Peoples R China |
| 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 | Wang, Xiujuan,Collett, Timothy S.,Lee, Myung W.,et al. Geological controls on the occurrence of gas hydrate from core, downhole log, and seismic data in the Shenhu area, South China Sea[J]. MARINE GEOLOGY,2014,357:272-292. |
| APA | Wang, Xiujuan.,Collett, Timothy S..,Lee, Myung W..,Yang, Shengxiong.,Guo, Yiqun.,...&Wang, XJ .(2014).Geological controls on the occurrence of gas hydrate from core, downhole log, and seismic data in the Shenhu area, South China Sea.MARINE GEOLOGY,357,272-292. |
| MLA | Wang, Xiujuan,et al."Geological controls on the occurrence of gas hydrate from core, downhole log, and seismic data in the Shenhu area, South China Sea".MARINE GEOLOGY 357(2014):272-292. |
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