地下瞬变电磁法全区视电阻率二分搜索算法

全空间全区视电阻率的求解方法是地下瞬变电磁理论研究的重要组成部分,为探讨二分搜索算法在井下资料处理中的适用性和精确性,将地面瞬变电磁法二分搜索算法引入至地下,并采用理论数据和实测数据进行对比分析。结果发现,全空间感应电动势随着电阻率增大具有单调递减规律,满足采用二分法求解的前提条件;全区视电阻率二分搜索算法具有较高的精确性,与全空间电阻率的最大误差仅为0.032%,且计算过程稳定、快速,单测点计算仅需十几秒钟便可获得唯一解。研究成果将为地下瞬变电磁法资料解释提供更多参考。

Binary Search Algorithm of All--time Apparent Resistivity in Underground Transient Electromagnetic Method

The solution of the full space and all time apparent resistivity is an important part of the underground transient electromagnetic theory. To explore the applicability and accu- racy of the binary search algorithm in the downhole data processing, the ground transient electromagnetic method of binary search algorithm needs to be introduced to the under- ground, and the theoretical data and the measured data are compared and analyzed. The re- sults showed that the induced electromotive force of full--space has the monotone decrea- sing regularity with the resistivity increases, which satisfies the prerequisite for using di- chotomy solving; all time apparent resistivity binary search algorithm has a higher accura- cy, with the full--space of resistivity maximum error of only 0. 032%, and the calculation of the process is stable and fast. After only more than 10 seconds of single measuring point calculation, you can obtain a unique solution. The research results will provide more refer- ences for underground transient electromagnetic method data interpretation.