| Gas hydrate identified in sand-rich inferred sedimentary section using downhole logging and seismic data in Shenhu area, South China Sea | |
| Wang, Xiujuan1; Lee, Myung2; Collett, Timthy2; Yang, Shengxiong3; Guo, Yiqun3; Wu, Shiguo1; Wang, XJ (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 256071, Peoples R China. | |
| 2014-03-01 | |
| 发表期刊 | MARINE AND PETROLEUM GEOLOGY
 |
| 卷号 | 51页码:298-306 |
| 文章类型 | Article |
| 摘要 | Downhole wireline log (DWL) data was acquired from eight drill sites during China's first gas hydrate drilling expedition (GMGS-1) in 2007. Initial analyses of the acquired well log data suggested that there were no significant gas hydrate occurrences at Site SH4. However, the re-examination of the OWL data from Site SH4 indicated that there are two intervals of high resistivity, which could be indicative of gas hydrate. One interval of high resistivity at depth of 171-175 m below seafloor (mbsf) is associated with a high compressional- wave (P-wave) velocities and low gamma ray log values, which suggests the presence of gas hydrate in a potentially sand-rich (low clay content) sedimentary section. The second high resistivity interval at depth of 175-180 mbsf is associated with low P-wave velocities and low gamma values, which suggests the presence of free gas in a potentially sand-rich (low clay content) sedimentary section. Because the occurrence of free gas is much shallower than the expected from the regional depth of the bottom simulating reflector (BSR), the free gas could be from the dissociation of gas hydrate during drilling or there may be a local anomaly in the depth to the base of the gas hydrate stability zone. In order to determine whether the low P-wave velocity with high resistivity is caused by in-situ free gas or dissociated free gas from the gas hydrate, the surface seismic data were also used in this analysis. The log analysis incorporating the surface seismic data through the construction of synthetic seismograms using various models indicated the presence of free gas directly in contact with an overlying gas hydrate-bearing section. The occurrence of the anomalous base of gas hydrate stability at Site SH4 could be caused by a local heat flow conditions. This paper documents the first observation of gas hydrate in what is believed to be a sand-rich sediment in Shenhu area of the South China Sea. (C) 2014 Elsevier Ltd. All rights reserved. |
| 关键词 | Gas Hydrate Sand-rich Synthetic Seismograms Compressional-wave Velocity South China Sea |
| 学科领域 | Geology |
| DOI | 10.1016/j.marpetgeo.2014.01.002 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000332811100023 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/23815 |
| 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 256071, Peoples R China. |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Qingdao 256071, 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,Lee, Myung,Collett, Timthy,et al. Gas hydrate identified in sand-rich inferred sedimentary section using downhole logging and seismic data in Shenhu area, South China Sea[J]. MARINE AND PETROLEUM GEOLOGY,2014,51:298-306. |
| APA | Wang, Xiujuan.,Lee, Myung.,Collett, Timthy.,Yang, Shengxiong.,Guo, Yiqun.,...&Wang, XJ .(2014).Gas hydrate identified in sand-rich inferred sedimentary section using downhole logging and seismic data in Shenhu area, South China Sea.MARINE AND PETROLEUM GEOLOGY,51,298-306. |
| MLA | Wang, Xiujuan,et al."Gas hydrate identified in sand-rich inferred sedimentary section using downhole logging and seismic data in Shenhu area, South China Sea".MARINE AND PETROLEUM GEOLOGY 51(2014):298-306. |
| 条目包含的文件 | ||||||
| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| Gas hydrate identifi（3988KB） | 限制开放 | ODC PDDL | 浏览 | |||
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论