| AVO analysis of BSR to assess free gas within fine-grained sediments in the Shenhu area, South China Sea | |
| Qian, Jin1,2; Wang, Xiu-Juan1,2; Wu, Shi-Guo1,2; Wang, Zhen-zhen1,2; Yang, Sheng-Xiong3; Wang, XJ (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China. | |
| 2014-06-01 | |
| 发表期刊 | MARINE GEOPHYSICAL RESEARCH
 |
| 卷号 | 35期号:2页码:125-140 |
| 文章类型 | Article |
| 摘要 | Gas hydrates have been identified from two-dimensional (2D) seismic data and logging data above bottom simulating reflector (BSR) during China's first gas hydrate drilling expedition in 2007. The multichannel reflection seismic data were processed to be preserved amplitudes for quantitatively analyzing amplitude variation with offset (AVO) at BSRs. Low P-wave velocity anomaly below BSR, coinciding with high amplitude reflections in 2D seismic data, indicates the presence of free gas. The absolute values of reflection coefficient versus incidence angles for BSR range from 0 to 0.12 at different CMPs near Site SH2. According to logging data and gas hydrate saturations estimated from resistivity of Site SH2, P-wave velocities calculated from effective media theory (EMT) fit the measured sonic velocities well and we choose EMT to calculate elastic velocities for AVO. The rock-physics modeling and AVO analysis were combined to quantitatively assess free gas saturations and distribution by the reflection coefficients variation of the BSRs in Shenhu area, South China Sea. AVO estimation indicates that free gas saturations immediately beneath BSRs may be about 0.2 % (uniform distribution) and up to about 10 % (patchy distribution) at Site SH2. |
| 关键词 | Gas Hydrate Elastic Velocity Free Gas Avo Shenhu Area |
| 学科领域 | Geochemistry & Geophysics ; Oceanography |
| DOI | 10.1007/s11001-014-9214-z |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000336371100003 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/23798 |
| 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.MLR, Guangzhou Marine Geol Survey, Guangzhou 510760, Guangdong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qian, Jin,Wang, Xiu-Juan,Wu, Shi-Guo,et al. AVO analysis of BSR to assess free gas within fine-grained sediments in the Shenhu area, South China Sea[J]. MARINE GEOPHYSICAL RESEARCH,2014,35(2):125-140. |
| APA | Qian, Jin,Wang, Xiu-Juan,Wu, Shi-Guo,Wang, Zhen-zhen,Yang, Sheng-Xiong,&Wang, XJ .(2014).AVO analysis of BSR to assess free gas within fine-grained sediments in the Shenhu area, South China Sea.MARINE GEOPHYSICAL RESEARCH,35(2),125-140. |
| MLA | Qian, Jin,et al."AVO analysis of BSR to assess free gas within fine-grained sediments in the Shenhu area, South China Sea".MARINE GEOPHYSICAL RESEARCH 35.2(2014):125-140. |
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| AVO analysis of BSR （9274KB） | 限制开放 | ODC PDDL | 浏览 | |||
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