一种感应测井趋肤效应校正的新方法

针对感应测井中测量信号不可避免地存在趋肤效应影响的问题，提出了一种使用视电导率实部分量或视电导率实部分量与虚部分量之和，通过对趋肤深度进行迭代实现复合线圈系感应测井测量信号趋肤效应校正的方法。使用视电导率实部分量与虚部分量之和进行迭代，校正结果与地层电导率几乎完全一致；使用视电导率实部分量进行迭代，无需测量视电导率虚部分量，迭代误差虽稍有增大，但可以通过增加迭代次数的方法加以改善。在通常的地层条件下，该迭代法的收敛条件均能满足。数值计算结果表明，该方法迭代公式简单、物理意义明确、校正结果精度高，且适用于各种线圈系结构，具有很强的通用性。

A NEW CORRECTION METHOD OF SKIN EFFECT FOR INDUCTION LOGGING

Aiming at the problem of skin effect for induction logging，the authors of this paper adopt the real component or both the real and the imaginary component of the apparent conductivity to achieve the correction of skin effect of composite-coil induction logging measurement signal.The iterative correction is achieved with the iteration of the skin depth.When the real and the imaginary component of the apparent conductivity is used to fulfill iteration，the correction results are almost entirely consistent with the formation conductivity.When the real component is used only，the correction error shows slight increase but it can be improved by using the iteration number.In addition，this method converges within the common range of the earth conductivity.Numerical results indicate that the method is simple in iterative formula，specifically physical meaningful，highly accurate and applicable to various coil system.