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.
出处
《勘探地球物理进展》
2005年第3期219-222,共4页
Progress in Exploration Geophysics
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
static shift correction
magnetotelluric sounding
3-D space filtering
phase weight correction
