摘要
本文分析研究了长偏移距瞬变电磁法感应电动势曲线随电阻率变化的规律,认识到感应电动势在任意时刻随电阻率的增大而具有分区单调的特性。据此,设计出了计算全区视电阻率的二分搜索数值算法。该算法可以利用感应电动势数据直接计算不同时刻的视电阻率值。理论数据的计算表明,该算法非常精确,相对误差在0.1%内,文中还给出了二分搜索算法的基本思想和详细步骤、以及流程图。
The rule of induced electromotive force curve with resistivity change in long offset transient electromagnetic method was studied and analyzed in this paper,it is understood that at any moment the increase of the induced electromotive force with resistivity shows a piecewise monotone feature. Based on the feature the bisearch numerical algorithm which calculates all-time apparent resistivity was designed in this paper. By utilizing induced electromotive force data the algorithm directly calculates apparent resistivity values at different moments,The calculation for theoretical data shows that the algorithm is very accurate,its relative error is less than 0.1 percent,the basic idea,detailed steps and exact flowchart for the bisearch numerical algorithm were introduced in this paper.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2009年第6期779-782,共4页
Oil Geophysical Prospecting
基金
国家自然科学基金项目瞬变电磁法"前沿"问题与拖拽式系统关键技术研究(No.40874094)
国家973项目非均质油气藏地球物理探测的基础研究(No.2007CB209607)联合资助
关键词
瞬变电磁法
全区视电阻率
二分搜索数值
算法
transient electromagnetic method,all-time apparent resistivity,algorithm