| Gas hydrate saturation from acoustic impedance and resistivity logs in the Shenhu area, South China Sea | |
| Wang, Xiujuan1,2; Wu, Shiguo1,2; Lee, Myung3; Guo, Yiqun4; Yang, Shengxiong4; Liang, Jinqiang4; Wang, XJ (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China | |
| 2011-09-01 | |
| 发表期刊 | MARINE AND PETROLEUM GEOLOGY
 |
| ISSN | 0264-8172 |
| 卷号 | 28期号:9页码:1625-1633 |
| 文章类型 | Article |
| 摘要 | During the China's first gas hydrate drilling expedition -1 (GMGS-1), gas hydrate was discovered in layers ranging from 10 to 25 m above the base of gas hydrate stability zone in the Shenhu area, South China Sea. Water chemistry, electrical resistivity logs, and acoustic impedance were used to estimate gas hydrate saturations. Gas hydrate saturations estimated from the chloride concentrations range from 0 to 43% of the pore space. The higher gas hydrate saturations were present in the depth from 152 to 177 m at site SH7 and from 190 to 225 m at site SH2, respectively. Gas hydrate saturations estimated from the resistivity using Archie equation have similar trends to those from chloride concentrations. To examine the variability of gas hydrate saturations away from the wells, acoustic impedances calculated from the 3 D seismic data using constrained sparse inversion method were used. Well logs acquired at site SH7 were incorporated into the inversion by establishing a relation between the water-filled porosity, calculated using gas hydrate saturations estimated from the resistivity logs, and the acoustic impedance, calculated from density and velocity logs. Gas hydrate saturations estimated from acoustic impedance of seismic data are similar to 10-23% of the pore space and are comparable to those estimated from the well logs. The uncertainties in estimated gas hydrate saturations from seismic acoustic impedances were mainly from uncertainties associated with inverted acoustic impedance, the empirical relation between the water-filled porosities and acoustic impedances, and assumed background resistivity. (C) 2011 Elsevier Ltd. All rights reserved.; During the China's first gas hydrate drilling expedition -1 (GMGS-1), gas hydrate was discovered in layers ranging from 10 to 25 m above the base of gas hydrate stability zone in the Shenhu area, South China Sea. Water chemistry, electrical resistivity logs, and acoustic impedance were used to estimate gas hydrate saturations. Gas hydrate saturations estimated from the chloride concentrations range from 0 to 43% of the pore space. The higher gas hydrate saturations were present in the depth from 152 to 177 m at site SH7 and from 190 to 225 m at site SH2, respectively. Gas hydrate saturations estimated from the resistivity using Archie equation have similar trends to those from chloride concentrations. To examine the variability of gas hydrate saturations away from the wells, acoustic impedances calculated from the 3 D seismic data using constrained sparse inversion method were used. Well logs acquired at site SH7 were incorporated into the inversion by establishing a relation between the water-filled porosity, calculated using gas hydrate saturations estimated from the resistivity logs, and the acoustic impedance, calculated from density and velocity logs. Gas hydrate saturations estimated from acoustic impedance of seismic data are similar to 10-23% of the pore space and are comparable to those estimated from the well logs. The uncertainties in estimated gas hydrate saturations from seismic acoustic impedances were mainly from uncertainties associated with inverted acoustic impedance, the empirical relation between the water-filled porosities and acoustic impedances, and assumed background resistivity. (C) 2011 Elsevier Ltd. All rights reserved. |
| 关键词 | Gas Hydrate Acoustic Impedance Saturation South China Sea |
| 学科领域 | Geology |
| DOI | 10.1016/j.marpetgeo.2011.07.002 |
| URL | 查看原文 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000295345900003 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/11499 |
| 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.Chinese Acad Sci, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 3.US Geol Survey, Denver Fed Ctr, Denver, CO 80225 USA 4.Guangzhou Marine Geol Survey, MLR, Guangzhou 510760, 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,Wu, Shiguo,Lee, Myung,et al. Gas hydrate saturation from acoustic impedance and resistivity logs in the Shenhu area, South China Sea[J]. MARINE AND PETROLEUM GEOLOGY,2011,28(9):1625-1633. |
| APA | Wang, Xiujuan.,Wu, Shiguo.,Lee, Myung.,Guo, Yiqun.,Yang, Shengxiong.,...&Wang, XJ .(2011).Gas hydrate saturation from acoustic impedance and resistivity logs in the Shenhu area, South China Sea.MARINE AND PETROLEUM GEOLOGY,28(9),1625-1633. |
| MLA | Wang, Xiujuan,et al."Gas hydrate saturation from acoustic impedance and resistivity logs in the Shenhu area, South China Sea".MARINE AND PETROLEUM GEOLOGY 28.9(2011):1625-1633. |
| 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 saturati（1928KB） | 限制开放 | -- | 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