页岩由于矿物的定向排列等因素呈现出各向异性，基于各向同性模型的地应力计算方法已不适用。综合测井、岩心实验、压裂施工等数据建立涪陵地区龙马溪组页岩横向各向同性地应力测井评价方法，主要包括：建立垂向有效压力与横波速度关系模板，预测地层压力；利用通过岩石物理建模的方法计算求取目的层的Biot系数；采用速度回归拟合的方法求取页岩横向各向同性介质6个刚度系数，计算横向、垂向杨氏模量及泊松比。应用结果表明横向各向同性模型能更好地反映实际地层情况。
Shale exhibits anisotropy because of preferred alignment of clay particles and tabular bedding.It is not appropriate to compute stress with isotropic model.We introduce a stress logging evaluation method for Longmaxi Formation shale based on transversely isotropic model by analyzing the relation between vertical effective stress and shear wave velocity to predict formation pressure，building rock physics model to compute Biot coefficient and using velocity-regression method to calculate stiffness coefficients.The application results indicate that transversely isotropic model reflects the actual formation more accurately.
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