应力效应下页岩动静态弹性各向异性特征

doi:10.11720/wtyht.2024.0014

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Abstract

The static elastic parameters are crucial for shale oil and gas production and fracturing through water injection. Under stress effects, anisotropy exerts significant impacts on the dynamic and static elastic characteristics of shales. Investigating the dominant factors and mechanisms controlling reservoirs' dynamic and static elastic characteristics is a burning key scientific problem in shale oil and gas production and fracturing through water injection. Based on triaxial compression tests combining mechanics and acoustics for shales under different pressurization methods, this study delved into the impacts of anisotropy on the compressional/shear wave (P-and S-wave) velocities and macromechanical properties of shales, and the response patterns of dynamic and static elastic characteristics of shales. The results are as follows: (1) With an increase in the pressure, the dynamic and static Young's moduli of shales increase at a gradually decelerating rate, finally tending to be stable; (2) At certain bedding angles, the dynamic and static Young's moduli are positively correlated, with the former higher than the latter, whereas the dynamic and static Poisson's ratios manifest a subtle correlation; (3) The dynamic and static stiffness coefficients of shales increase with the confining pressure. The P-wave-related dynamic stiffness coefficients C₁₁ and C₃₃ display more significant changes than the S-wave-related dynamic stiffness coefficients C₄₄ and C₆₆; (4) The dynamic and static anisotropies of shales also increase with the confining pressure. The results of this study reveal the response mechanisms of the dynamic and static elastic characteristics of shales while providing crucial mechanical parameters for the exploitation and hydraulic fracturing of shale oil and gas reservoirs, thus demonstrating significant scientific research value.

Key words： shale anisotropy elastic property static modulus formation pressure

Received: 15 January 2024 Published: 08 January 2025

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	Articles by authors
	Hui-Yuan BIAN
	Xin ZANG
	Di ZHANG
	Cheng-En ZHANG
	Xiao-Min NIE
	Yin-Ting WU

Cite this article:

Hui-Yuan BIAN,Xin ZANG,Di ZHANG, et al. Impacts of anisotropy on the dynamic and static elastic characteristics of shales under stress effects[J]. Geophysical and Geochemical Exploration, 2024, 48(6): 1664-1673.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.0014 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I6/1664

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Sedimentary system of the second member of Kongdian Formation, Cangdong Depression^[23]

Orientation of shale coring at different angles

Optical scanning of shale at different bedding angles

Basic parameters of shale oil samples in the second member of kongdian Formation,Cangdong Depression

Mineral groups of shale samples %

Clay content table of shale samples

Photos of thin sections of shale samples

Flow chart of rock sample acoustical and mechanical joint measurement principle

Stress loading path and dynamic and static elastic parameter test diagram

Relation between stiffness coefficient and confining pressure

Relationship between static elastic parameters and confining pressure

Relationship between dynamic elastic parameters and confining pressure

Dynamic and static elastic parameter relationships in different directions

Relationship of dynamic and static elastic parameters

Relationship between dynamic and static anisotropy coefficient and confining pressure

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