AVO analysis of BSR to assess free gas within fine-grained sediments in the Shenhu area, South China Sea

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	AVO analysis of BSR to assess free gas within fine-grained sediments in the Shenhu area, South China Sea
	Qian, Jin 1,2; Wang, Xiu-Juan 1,2; Wu, Shi-Guo 1,2; Wang, Zhen-zhen 1,2; Yang, Sheng-Xiong 3
刊名	MARINE GEOPHYSICAL RESEARCH
	2014-06-01
卷号	35 期号:2 页码:125-140
关键词	Gas hydrate Elastic velocity Free gas AVO Shenhu area
通讯作者	Wang, XJ (reprint author), Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China.
英文摘要	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.
学科主题	Geochemistry & Geophysics; Oceanography
收录类别	SCI
语种	英语
WOS记录号	WOS:000336371100003
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/23798]
专题	海洋研究所_海洋地质与环境重点实验室
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.(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.