大斜度井双侧向测井响应数值模拟及电阻率各向异性校正方法

通过建立碳酸盐岩储层大斜度井双侧向测井响应三维有限元模型，分别模拟了井斜角、电各向异性系数对双侧向测井的影响，并制作了深、浅探测电阻率各向异性校正图板，该校正图板考虑了双侧向测井仪器的实际探测特性，比传统电各向异性校正公式具有更明确的物理意义。为了验证校正图板及校正方法的有效性，对四川盆地灯影组某碳酸盐岩储层钻取的水平方向和垂直方向岩心进行了高温、高压岩电实验，分别制作了该储层水平电阻率和垂直电阻率的温压校正图板，根据储层温度、围压条件分别校正水平、垂直电阻率，并求取储层温度、压力条件下电阻率各向异性系数。基于该校正方法对大斜度井储层双侧向测井数据进行电各向异性校正，结果表明，校正后大斜度井双侧向测井电阻率数据与邻近直井中对应储层段双侧向测井值具有更好的一致性，验证了该校正方法的有效性。

Numerical simulation and resistivity anisotropic correction method of dual laterolog response in highly deviated well

This paper introduces the 3D finite element model (FEM) for simulating the dual laterolog response in the highly deviated well of carbonate re-servoirs. The effects of deviation angle and electrical anisotropy are considered in the numerical si-mulation. The correction charts of resistivity aniso-tropy in the deep and shallow investigation are proposed for the dual laterolog. These charts consider the investigation characteristics of dual laterolog tools and have more definite physical significance than the traditional anisotropic correction formula. To validate the effectiveness of the correction chart and method, core samples parallel and perpendicular to the carbonate reservoir of Dengying Formation in the Sichuan Basin are used in the high-temperature and high-pressure rock electricity experiment. The temperature and pressure correction charts are made to correct the horizontal and vertical resistivity, following which the anisotropy coefficient is obtained under certain temperature and pressure conditions. Then anisotropic correction is conducted on the dual laterolog data from the highly deviated well. Compared with those uncorrected, the corrected dual laterolog data from the highly deviated well are in better agreement with counterparts from the neighboring vertical well, which verifies the effectiveness of the correction method.