Numerical simulation and resistivity anisotropic correction method of dual laterolog response in highly deviated well
LAI Qiang1, TANG Jun2, WU Yuyu1, XU Wei2, XIE Bing1, JIN Yan1
1. Research Institute of Exploration and Development, Southwest Oil and Gas Company, CNPC, Chengdu, Sichuan 610041, China; 2. College of Geophysics and Petroleum Resources, Yangtze University, Wuhan, Hubei 430100, China
Abstract：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.
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