电磁场延拓成像中对多次波和透过波的压制方法

Theoretical Effect of Electromagnetic Field Continuation Imaging on Multiple and Proximity Rejection.

与地震勘探一样,大地电磁勘探也存在着多次波与透过波干扰,研究这一问题对于大地电磁勘探资料的地质解释非常重要。本文从理论上分析了大地电磁拟地震解释中多次波的存在,指出了大地电磁测深电磁波反射函数中不存在多次波干扰而仅有上透过波干扰,导出了电磁波反射函数与上透过波干扰的数学关系,指出了压制上透过波干扰的选频办法。最后,用大地电磁拟地震解释法和电磁波反射函数延拓成像法对理论模型进行了计算,证实了前面的理论。

Similar with seismic prospecting,there exist multiple and proximity disturbances in magneto-electrotel-luric exploration(MTE).To study this problem is an important in geologic interpretation of MTE data.Theoretically,this study analyzed existence of multiple wave in pseudo seismic interpretation of MT,pointed out that no multiple interfer-ence appears in the magneto-electrotelluric sounding reflectance functions,and derived mathematical relations between the reflectance function and top proximity interference,giving the way of frequency-selecting for rejection of top proxim-ity interference.Finally,the theoretical model was estimated by using pseudo seismic interpretation of MT and electro-magnetic reflectance function continuation imaging methods for indicating effect of the theory.