CSAMT静态校正及其在煤矿采空区探测的应用

可控源音频大地电磁法（CSAMT）是一种煤矿采空区探测的有效方法，针对可控源音频大地电磁法易受浅部不均匀体影响出现静态效应的特点，参考瞬变电磁法（TEM）晚期视电阻率数据，使用曲线平移法对CSAMT数据进行校正，可以消除静态影响，还原真实的电阻率响应，提高数据解释的精度。以正演模型为例，验证了方法的有效性。将该方法应用于山西某煤矿采空区探测，校正后的反演结果与已知资料吻合，取得了良好的探测效果。理论和实践证明了该校正方法的可行性。 

CSAMT static correction and its application in detection of coal mine goaf

Controlled source audio magnetotelluric(CSAMT) is an effective method for detecting coal mine goaf. As static effects of CSAMT is susceptible to produce due to the influence of shallow inhomogeneity, CSAMT data can be corrected by using the curve-shift method based on the late apparent resistivity data of TEM. It can eliminate the static effect and ensure true resistivity response, and improve the accuracy of data interpretation. Taking the forward model as an example, the effectiveness of this method was verified. This method was applied to detect the goaf in a coal mine in Shanxi. Results of inversion by corrected data coincided well the known data. The theory and practice prove that the correction method is feasible and has good detection effect.