CSAMT法静态效应模拟及其校正方法对比

在可控源音频大地电磁法中,由于浅层不均匀体的存在,总会存在一些静态现象。而静态问题又一直是电磁测深领域一个棘手的问题,它直接影响到电磁测量结果的解释。因此,必须对这种影响进行校正。这里通过对低阻静态模型的响应特征进行分析,并选用几种常见的静校正方法进行校正,对比其校正效果。

MODELING OF STATIC EFFECT IN CSAMT AND COMPARISON OF DIFFRENT CORRECTION METHODS

There always exist static effects because of shallow inhomogeneous bodies in controlled source audio-frequecy magnetotellurics (CSAMT), resulting in difficulties in data interpretation. Therefore ii is very important to correct static shift in CSAMT data. Analyses of the static effects have been conducted in the paper through modeling with conductive static models, a comparison has also been made for some correction methods selected.Because of the existence of shallow inhomogeneous bodies in CSAMT (Controlled source audio-frequency magnetotellurics), static shift always occurs, which makes the interpretation of CSAMT data very difficult, or even impossible. So it is very important to correct static shift in the interpretation of CSAMT data. In this paper, the response character of the low resistance static model is analysed, the static shift in some instance is corrected by using several static correction methods , their correction results are compared, and they all appears the better result. After static correction, a better quality data is achieved.