用阻抗相位识别二维音频大地电磁垂向异常

Vertical anomaly interpretation of 2D audio magnetotelluric using the impedance phase

从原理上分析了音频大地电磁阻抗相位在静位移和垂向电性异常体影响下的变化特性,并采用二维有限元方法进行了正演模拟。考虑到阻抗相位在静位移和真实垂向异常中的响应差异,认为利用阻抗相位开展综合解释对于识别二维垂向电性异常具有十分积极的意义。理论模型计算和工程实例表明,基于阻抗相位的综合解释方法对于识别二维垂向电性异常具有较好的应用效果。

For the identification problem of vertical geoelectric anomalies in the audio magnetotelluric sounding,from the princi-ple,we analyze the variation characteristic of impedance phase under the influence of static displacement and vertical electrical abnormal body.At the same time,we use two-dimensional finite element method for forward simulation and analysis the re-sponse of impedance phase.Considering its response differences in the static shift and true vertical anomalies,we think that it haspositive significance to use impedance phase for vertical anomalies interpretation,and achieved good application effect in the practical work.