中文摘要：

电流线分布是评价双侧向测井仪器探测性能的一种辅助手段．通常采用基于电位的有限元数值模拟方法，通过对电位的微分获得电流线的分布，这种处理方法引入了额外误差．为解决此问题，本文提出了一种基于周向磁场强度的有限元方法，通过对视电阻率和电流线的数值模拟验证了新方法的正确性，且新方法在计算电流线方面优于电位法．在此基础上，针对泥浆低侵和高侵两种情况，模拟了深浅侧向测井的视电阻率响应和电流线的分布，分析了侵入带对双侧向测井响应的影响规律．

英文摘要：

Current line distribution is an auxiliary means to evaluate the performance of dual laterolog tools. Generally the voltage potential method is applied and the current line is obtained by differentiating the voltage potential, which may introduce extra error. To solve this problem, a finite element numerical simulation method based on circumferential magnetic field intensity is proposed in this paper. The correctness of the new method is verified by comparing the apparent resistivity curves and current line distribution resulted from the two methods. Furthermore, the circumferential magnetic field intensity method is superior to the voltage potential method in the aspect of current line distribution. The apparent resistivity and the current distribution are calculated under the condition of high invasion formation and low invasion formation. The influence of an invaded zone on the response of dual laterolog is analyzed.