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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
DOI10.1007/s11001-014-9214-z
收录类别SCI
语种英语
WOS记录号WOS:000336371100003
引用统计
被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
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
第一作者单位中国科学院海洋研究所
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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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