Discussion on the relationship between elastic anisotropy and mineral distribution of Longmaxi Shale

doi:10.6038/cjg2020N0105

	Discussion on the relationship between elastic anisotropy and mineral distribution of Longmaxi Shale
	Wu YuMing 3; Lan HengXing 2,3; Huang WeiQing 1
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2020-05-01
卷号	63 期号:5 页码:1856-1866
关键词	Acoustics velocity Mineral distribution Heterogeneity Anisotropy
ISSN号	0001-5733
DOI	10.6038/cjg2020N0105
通讯作者	Lan HengXing(lanhx@lreis.ac.cn)
英文摘要	Anisotropy is a common characteristic of rock elasticity. However, the factors inducing elastic anisotropy of rocks are complex and still controversial. This paper aims to inspect the relationship between elastic anisotropy and mineral distributions of rocks using the Longmaxi Shale from Chongqing, China. The mineral distributions on three orthogonal directions were obtained by AmicSCAN (a back scattered electron detector) on 3 mmX3 mm X1 mm samples, and the P-wave and S-wave velocities, which characterize rock elasticity, were measured by Panametrics-NDT transducer. A variation coefficient was introduced to characterize the variation of minerals and fractures in certain directions. The variation indices in two orthogonal directions were used to establish a heterogeneity index to characterize the difference of minerals and pores in different directions. The micro back scattered images showed that the Longmaxi shale was mainly composed of quartz and illite, and both the two principal minerals and pores are well-oriented on the X-plane and Y-plane. In addition, both the variable coefficients of the two principal minerals and pores decrease with the increase of the angle to the direction of the large principal stress on the X-plane and Y-plane. However, there are no differences in variable coefficients on the Z-plane. In term of acoustic characteristics, the velocities and anisotropy indexes show similar rules, which may be related to the heterogeneity of distributions of quartz, clay minerals, and pores. These results indicated that the elastic anisotropy was caused by minerals, pore and crack distribution.
WOS关键词	SEISMIC PROPERTIES ; RESERVOIRS ; ZONE
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000539702900011
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/162158]
专题	中国科学院地理科学与资源研究所
通讯作者	Lan HengXing
作者单位	1.Chinese Adademy Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Changan Univ, Sch Geol Engn & Geomat, Xian 710064, Peoples R China 3.Chinese Adademy Sci, State Key Lab Resources & Environm Informat Syst, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Wu YuMing,Lan HengXing,Huang WeiQing. Discussion on the relationship between elastic anisotropy and mineral distribution of Longmaxi Shale[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2020,63(5):1856-1866.
APA	Wu YuMing,Lan HengXing,&Huang WeiQing.(2020).Discussion on the relationship between elastic anisotropy and mineral distribution of Longmaxi Shale.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(5),1856-1866.
MLA	Wu YuMing,et al."Discussion on the relationship between elastic anisotropy and mineral distribution of Longmaxi Shale".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.5(2020):1856-1866.