CSAMT水平电场单分量反演方法研究及应用  

Research and Application of 1D Inversion for CSAMT Ex Component in Exploration

作　　者：鲁杏[1] 张胜业[2] Lu Xing;Zhang Shengye(Geological Exploration Technologies Institude of Anhui Province, Hefei Auhui 230031, China;Institute of Geophysics & Geomatics, China University of Geosciences, Wuhan Hubei 430074, China)

机构地区：[1]安徽省勘查技术院,安徽合肥230031 [2]中国地质大学地球物理与空间信息学院,湖北武汉430074

出　　处：《工程地球物理学报》2020年第5期628-635,共8页Chinese Journal of Engineering Geophysics

基　　金：国家重点研发计划项目(编号:2018YFC0603606)。

摘　　要：CSAMT方法是一种常见的电磁勘查方法,与常规处理卡尼亚视电阻率不同,它是研究了可控源音频大地电磁法(CSAMT)中Ex分量的一维反演方法。首先针对水平电偶极子激发的电磁场,利用汉克尔数值滤波算法对水平层状电磁场进行了正演计算。然后基于最小二乘原理建立的反演目标函数,在反演方程中加入了大地电磁Occam反演方法的光滑度矩阵,实现了对CSAMT方法中的水平电场分量一维反演。最后通过理论模型以及实际资料的反演对比,认为基于水平电场分量的一维反演方法稳定、可靠、应用效果较好。结果表明,本次研究成果可丰富CSAMT数据处理手段,为地质解释提供多角度的物探资料。As is well known,CSAMT is a common electromagnetic exploration method.In this paper,the 1D inversion method of CSAMT Ex component in exploration is used,compared with the conventional method to deal with the Carnia apparent resistivity.Using Hankel digital filter algorithm to simulate electromagnetic fields of the horizontal layers for the electromagnetic field excited by horizontal electric dipole.In the 1D inversion,we establish the inverse objective function by using least square principle and use the smooth model of the Occam method.We think that the 1D inversion method of the Ex component is stable,reliable and has good application effect through the theoretical model and practical data.It turns out that,the research results of this paper can enrich CSAMT data processing means and provide multi angle geophysical data for geological interpretation.

关 键 词：可控源音频大地电磁法 水平电场分量 一维反演 

分 类 号：P631.3[天文地球—地质矿产勘探]