大地电磁测深法阻抗相位的特性与应用  

CHARACTERISTICS AND APPLICATION OF THE IMPEDANCE PHASE OF MAGNETOTELLURIC SOUNDING

作　　者：刘建利[1,2] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]陕西省地质矿产勘查开发局物化探队,陕西西安710043

出　　处：《物探与化探》2013年第1期73-77,共5页Geophysical and Geochemical Exploration

摘　　要：作为大地电磁测深法的主要参数,阻抗相位和视电阻率相比,具有较强的抗干扰能力和较高的分辨率。笔者从分析阻抗相位与视电阻率的关系入手,导出了相位视电阻率的递推公式,分析了阻抗相位的重要特性。以银额盆地实测大地电磁测深剖面资料的处理和解释为例,利用相位递推视电阻率校正了低频段视电阻率曲线的形态畸变,使视电阻率的残余静态效应得到了较好的压制,利用相位曲线的极值点准确地确定了白垩系低阻电性层的界面,弥补了视电阻率在资料解释中的不足之处,说明了阻抗相位在大地电磁测深资料处理解释中的作用。As a main parameter of magnetotelluric sounding,the impedance phase has strong capability of resisting disturbance and high resolution in comparison with apparent resistivity.In this paper,through analyzing the relationship between the apparent resistivity and the impedance phase,the authors derived the recursive formula of phase apparent resistivity and analyzed the important properties of the impedance phase.With the processing and interpretation of magnetotelluric sounding profiles data measured in Yin＇e basin as an example,the authors used phase recursive apparent resistivity and corrected the distortion of the apparent resistivity curve in the low frequency.It is shown that the apparent resistivity residual static effects have been better suppressed.Using the extreme point of the phase curve,the authors accurately determined the low-impedance Cretaceous layer interface,made up the inadequacy of the apparent resistivity data in interpretation,and described the application for impedance phase in the magnetotelluric sounding data processing and interpretation.

关 键 词：大地电磁测深法 阻抗相位 视电阻率 静态校正 电性界面 银额盆地 

分 类 号：P631[天文地球—地质矿产勘探]