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《Oil Geophysical Prospecting》 2009-06
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The all-time apparent resistivity bisearch numerical algorithm based on long offset transient electromagnetic method

Chen Qing-li1,Yan Liang-jun1,Fu Zhi-hong2 and Su Zhu-liu1. 1.Institute of Geophysics and Petroleum Resources,Yangtze University,Jingzhou City,Hubei Province,434023,China2.Institute of Electrical Engineering,Chongqing University,Chongqing City,400044,China  
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.
【Fund】: 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
【CateGory Index】: P631.325
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