CSAMT资料处理中的静校正问题

Static Correction of CSAMT Data

可控源音频大地电磁测深（Controlled Source Audio-frequency Magnetotellurics简称CSAMT）标量测量具有很多优越性：相对于Magnetotellurics（MT）不仅测量更加快速，而且还可更少受到测区内人文噪声的干扰；又由于探测深度不是靠供电电极几何尺寸的变化而是靠频率的变化而实现，故深山陡谷或狭小的区域内都可进行探测。此方法在0．25-8192Hz的频率范围进行测量时，CSAMT法还可提供良好的深穿透能力，可从地表达到几公里的深度，还具有良好的横向分辨率，不容易受地形因素的影响。然而由于在实际测量中受地形和不均匀体的影响，会使CSAMT曲线发生畸变，即静态效应。这种现象如果在资料处理中得不到消除，就会造成资料解释的误差甚至错误。本文通过CSAMT在实际工程勘探中的应用，介绍了静态效应对CSAMT资料的影响、如何对CSAMT资料进行静态校正、对CSAMT资料进行静态校正后的效果。

Controlled Source Audio-- frequency Magnetotellurics （CSAMT） scale measurement has many advantages; first, doing CSAMT points the speed is very faster and less disturbed by the human noise than Magnetotellurics; second, CSAMT can be applied in remote mountains and steep valley or hole--in--the-wall area because the prospecting depth of CSAMT is achieved by the frequency; third, CSAMT method provides a better penetrating ability from the earth＇s surface to above 1 kilometer and a better transverse resolving capability. But in actual measureme ence of terrain and heterogeneous b nt, CSAMT curve can be distorted because of the influ- ody, so called static effect, which makes a great differ- ence in the data interpretation and data accuracy. In this paper the static effect on CSAMT data is introduced, static correction is presented and the result is indicated after static effect correction with the actual application of CSAMT in the engineer prospecting.