三维高频远场平面波电磁勘探中的E_z研究

Study on Ez research in electromagnetic exploration of three dimensional high-frequency far-field plane wave

随着电磁探测的发展,三维精细勘探为复杂地质模型的分析提供了有效工具,为了更精细地研究大地介质的特性,利用三维矢量有限元模拟分析了三维异常模型的Ez、Hz分量的响应特征。Ez分量对界面异常敏感,在界面处存在突变;Hz分量则在界面处不存在突变,但界面处出现Hz分量极值,对异常体的变化也有一定的灵敏度。同时,进一步提出采用上下两个测点的数据比值进行归一化处理来获得稳定的传输函数。

Along with the development of electromagnetic detection,3D fine exploration provides effective tools for the analysis of the complex geological model.In order to study the characteristics of the earth media more carefully,based on vector model of the 3D finite element simulation analysis abnormal Ez,Hz response characteristics of the component.The Ez component is very sensitive to the interface with a mutation.The Hz component does not have a mutation at the interface,but the Hz component of the interface appears at the extreme value,and there is a certain sensitivity to the change of the abnormal body.At the same time,this paper further proposes that the data ratio of the two measuring points can be used to obtain stable transfer function.