Correction methods for acoustic anisotropy of bedding shale

LI Xiansheng; LIU Xiangjun; LIANG Lixi; LI Wei; GAO Yang; XIONG Jian

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Correction methods for acoustic anisotropy of bedding shale
Vol. 10, Issue 5, Pages: 49-54(2020)
Published：2020
DOI：
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DOI：

LI Xiansheng, LIU Xiangjun, LIANG Lixi, et al. Correction methods for acoustic anisotropy of bedding shale[J]. Petroleum Reservoir Evaluation and Development, 2020, 10(5): 49-54. DOI：

摘要

层理性页岩的物理、力学性质多表现出较强的各向异性

导致同一地层在直井、水平井中测井响应差异大

造成区域储层评价等困难。基于数值模拟实验方法分析了层理角度、层理密度对页岩纵波各向异性的影响

构建了龙马溪组页岩纵波各向异性校正模型

结合室内纵波实验分析了校正模型的合理性。结果表明

龙马溪组页岩纵波各向异性特征明显

纵波各向异性系数分布在1.088 ~ 1.109;纵波各向异性系数与层理角度正弦值呈二次多项式关系;随着层理密度增加

声波各向异性系数近似线性增加。实例应用表明

利用所构建声波各向异性校正模型能将水平井声波响应合理地校正为直井响应。

Abstract

The physical and mechanical properties of bedding shales show strong anisotropy

which leads to the significant difference in the logging response of the same formation between the vertical wells and the horizontal wells

and bringing the difficulties in regional reservoir evaluation. Based on the numerical simulations

the influence of orientation and density of bedding on the anisotropy of longitudinal wave has been analyzed

and a correction model for longitudinal wave of shale in Longmaxi formation has been built. Then

combined with the indoor compression wave experiment

the rationality of this new model has been analyzed. The results show that

the longitudinal wave anisotropy of shales in Longmaxi formation is obvious

and the coefficient of longitudinal wave is around 1.088 ~ 1.109. The coefficient of longitudinal wave anisotropy has a quadratic polynomial relation with the sine of the bedding angle

and the anisotropic coefficient increases linearly with the increase of bedding density. Application examples show that this new model can reasonably correct the acoustic response of horizontal wells to that of vertical wells.