基于交叉偶极子阵列声波资料精细评价地应力方法

地应力是油气储层勘探开发中重要分析参数之一，通常利用电成像与地层倾角测井获取直观、准确的地应力方向，而阵列声波资料在作业中易受井眼与地层的影响，获得的地应力方向与其他方法有差异。此文采用阵列声波各向异性分析与电成像数据结合的方式，提出了如何利用声波数据准确识别地应力方法。研究表明:诱导缝发育层段中快横波传播方向与地应力方向呈小角度相交，而诱导缝不发育层段快横波方位能够代表最大水平主应力方向。

The Method of Evaluating Ground Stress Based on Cross Dipole Acoustic

Ground stress is one of the important parameters in the exploration and development of oil and gas reservoirs. Generally, the intuitive and accurate ground stress directions are obtained by electrical imaging and formation dip logging, while the ground stress direction given by array acoustic wave is difference from other methods for its being easily affected by the borehole and formation condition. In this paper, a method is proposed to improve the accuracy of judging the ground stress direction by acoustic wave through combining electrical imaging and acoustic anisotropy. The research shows that the direction of fast shear wave propagation and the direction of ground stress are intersected at a small angle in the developed layer with induced fractures, while the direction of fast shear wave in the undeveloped layer with induced fractures can represent the direction of maximum horizontal principal stress.