基于应力诱导各向异性与岩石力学性质的深层页岩储层可压裂性评价方法研究

理论与实践证实，精确的储层可压裂性评价是提高深层页岩储层压裂改造成功率的关键问题之一。本项目以提高深层储层可压裂性评价精度为导向，重点解决各向异性参数反演、各向异性弹性参数计算、各向异性地应力计算、岩石力学性质表征参数计算、古构造应力计算等基础科学问题。针对影响储层压裂改造的关键因素，开展基于Backus平均模型和贝叶斯理论的各向异性弹性参数计算、基于VTI介质弹性参数和有效应力原理的应力诱导各向异性预测、基于Mohr-Coulomb强度准则和Anderson三轴地应力模式的岩石力学性质预测、基于应力诱导各向异性与岩石力学性质的深层页岩储层可压裂性评价等方法研究和试验应用。从（古、今）地应力状态和岩石力学性质的角度，以内因与外因相结合的模式实现裂缝预测，以多参数、宽方位、强综合性的模式实现储层可压裂性评价，并建立一套基于应力诱导各向异性与岩石力学性质的深层页岩储层可压裂性评价方法。

It has been proved by theory and practice that accurate evaluation of reservoir fracturing ability is one of the key problems to improve the success rate of fracturing and reforming of deep shale reservoirs. Guided by improving the evaluation accuracy of deep reservoir fracturing, this project focuses on solving basic scientific problems such as anisotropic parameter inversion, anisotropic elastic parameter calculation, anisotropic in-situ stress calculation, rock mechanical property characterization parameter calculation and paleo-tectonic stress calculation. Aiming at the key factors affecting reservoir by fracturing, the first is calculating the anisotropic elasticity parameters based on the average model Backus and Bayesian theory, the second is stress induced anisotropy prediction based on the elastic parameters of VTI media and the effective stress principle, the third is rock mechanics properties prediction based on the Mohr - Coulomb strength criterion and Anderson triaxial geo-stress model, the last is deep shale reservoir fracturing evaluation method research and its application based on the stress induced anisotropy of rocks. From in-situ stress（paleotectonic and present stress）and rock mechanics properties, by combining with external pattern implementation within fracture prediction, with multiple parameters, wide azimuth, strong comprehensive mode, we can realize the reservoir fracturing evaluation, and establish a set of deep shale reservoir fracturing evaluation method.