电偶源频率电磁测深激发极化效应研究

Induced Polarization effect on frequency-domain electromagnetic sounding with electric dipole source

本文研究含激电效应(IP)电偶源频率电磁测深问题.首先,通过对电偶源频率电磁测深电磁场分量分辨率的分析,提出利用电场E_x分量提取IP信息的合理性;然后,给出了同时存在激电和电磁效应时的理论计算公式和算法,对一些典型地电断面进行理论计算并对计算结果进行分析;最后,提出提取IP信息的几种可能方案.这些工作不仅为野外实测资料IP信息的提取提供理论依据,同时为进一步实现电磁响应中感应效应与激电效应分离提供基础.

The Induced Polarization （IP） effect on frequency-domain electromagnetic sounding with electric dipole source is studied in this paper. Firstly, the reasonability of extracting IP information from electrical field Ex was discussed by analyzing the resolution of the electromagnetic field components in frequency-domain electromagnetic sounding with electric dipole source. Then, corresponding theoretical calculation formula and algorithm of frequency electromagnetic sounding when Induced Polarization effect and electromagnetic effects coexist are introduced, and some typical earth models are calculated and corresponding results are analyzed. Finally, some possible methods to extract IP information were put forward. This study not only provides theoretical basis for extracting IP information from field data but also can be used to separate Induced Polarization effect from electromagnetic effect.