大地电磁三维静态位移校正方法及其应用效果  

3-D static shift correction of magnetotelluric sounding data and its application.

作　　者：吴炳良 邵敏[2] 

机构地区：[1]湖南省益阳高新技术产业开发区管委会,湖南益阳413000 [2]深圳职业技术学院,广东深圳518055

出　　处：《勘探地球物理进展》2005年第3期219-222,共4页Progress in Exploration Geophysics

摘　　要：浅层不均匀体对大地电磁测深曲线有较大的影响,这种影响必须得到校正,否则会使解释结果产生畸变。讨论了用三维中值滤波和三维空间滤波2种方法进行静态位移校正,比较了三维滤波法校正前后的数据变化,证明了该方法的实际应用效果。三维中值滤波对压制或消除实测数据中随机干扰、强电或工业电磁干扰以及近地表电性体不均匀畸变影响有很好的作用,具有较高的实用价值。Because of existence of shallow inhomogeneous bodies.static shift occurs in magnetotelluric sounding curves, which makes interpretation of MT data very difficult, or even impossible. We presented two methods for static shift correction, one is 3-D phase weight correction and the other is 3-D space filtering.Case studies showed that 3-D phase weight correction is superior in reducing or even eliminating random interferences, strong electric or industrial electromagnetic interferences, and shallow inhomogeneous bodies.

关 键 词：静态位移校正 大地电磁测深 三维空间滤波 中值滤波 

分 类 号：P631.325[天文地球—地质矿产勘探]