【摘要】 在介绍点电流源的数值模式匹配法基础上,提出了一种电测井圆柱形电极处理快速方法。该方法是利用1个放置在电极内的点电源来模拟柱状电极,使得电极外表面的边界条件与原问题一致,可以很好地模拟圆柱电极在地层中的场分布。该方法避免了划分柱状电极为多个圆环形电流源的复杂计算方法,大大减少了计算量,且可以保证计算精度。利用该方法计算了双侧向测井响应并与已有文献结果进行了比较;另计算了阵列侧向测井响应,并与有限元法计算结果进行了对比,通过实例计算与对比验证了该方法的准确性与高效性。更多还原

【Abstract】 On the basis of the brief introduction on the Numeric Mode-matching Method(NMM) concerning the point source,a fast method for simulating the cylindrical electrodes in the calculation of electrical lateral log response is presented.The fast method simulates a cylindrical electrode by placing a point source inside the electrode,which makes this method’s boundary condition agree with the original problem.The field distribution of the cylindrical electrode can be well simulated.Consequently the complex process of dividing cylindrical electrode into a few ring electrodes is avoided.The calculation time can be reduced greatly with the presented methods.The response of the dual lateral logging is calculated using the fast-algorithm and compared with the results of reference.The responses of array lateral logging are also calculated and compared between the fast-algorithm and the Finite Element Method.The precision and the high-efficiency of the fast method presented in the paper are verified by calculating and comparing the logging responses.更多还原