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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。
The method of solving apparent resistivity in the whole space is an important part of the research on underground transient electromagnetic theory. In order to discuss the applicability and accuracy of binary search algorithm in downhole data processing, the binary search algorithm of ground transient electromagnetic method is introduced to Underground, and using theoretical data and measured data for comparative analysis. The results show that full space induced electromotive force decreases monotonically with the increase of resistivity, which satisfies the premise of dichotomy. The whole region apparent resistivity dichotomy search algorithm has higher accuracy, and the maximum error of full space resistivity Only 0.032%, and the calculation process is stable and fast. The calculation of a single measurement point takes only ten seconds to obtain the unique solution. The research results will provide more references for the interpretation of the data of the underground transient electromagnetic method.