焦石坝地区页岩各向异性及其影响的分析研究

doi:10.11720/wtyht.2019.1239

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Abstract

Because of the particular depositional mode,black organic matter-rich shales are generally characterized by strong velocity anisotropy;however,most researches on shale are on the basis of isotropic theory,which obviously ignores the geological characteristics of shale.In this paper,anisotropic parameters of shale are calculated by combining rock mechanical measurements in the laboratory with the empirical methods from the literature.On the one hand,the parameters are used to investigate their effects on the calculation of velocity versus bedding direction and rock mechanical parameters,and the result shows that the anisotropic characteristics of shale cannot be neglected when the dip angle of the strata is large.On the other hand,little difference between AVO responses of anisotropic and isotropic methods when the incidence angle is less than 40° indicates the feasibility of isotropic pre-stack seismic inversion in predicting shale "sweet spot".

Key words： shale anisotropy rock velocity AVO response brittleness index

Received: 19 June 2018 Published: 10 April 2019

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	Articles by authors
	Wen-Cheng LI
	Zhe-Yi FU

Cite this article:

Wen-Cheng LI,Zhe-Yi FU. The anisotropic characteristics and impact of organic-rich shale:A Jiaoshiba demonstration[J]. Geophysical and Geochemical Exploration, 2019, 43(2): 266-272.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1239 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I2/266

Regional location of research area

Thin section (a) and FMI image (b) of shale reservoir for JY1

Crossplot of anisotropic parameters ε(a)、γ(b)versus clay content

Statistics of anisotropic parameters calculated by different methods

Normalized P-(a) and S-wave (b) velocity variation with dip angle of shale layers

Velocity、density and anisotropic parameters for different intervals

Comparison of AVA curve between isotropic and anisotropic methods

Crossplot of density and TOC (a) and inverted TOC section using isotropic method (b)

Slices of shale apparent brittleness index (a) and horizontal brittleness index (b)

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