瞬变电磁法对煤矿老窑采空区探测效果分析

煤矿老窑采空区探测一直是煤田地质勘探的难点。文章从目前探测老窑采空区的主要工作方法研究入手,分析了采空区地质及电性特征,采用瞬变电磁法对甘肃河西某煤矿浅部老窑采空区进行了探测,合理解释了低阻异常,圈定了采空区边界。结合二维地震解释成果及区内其它已知资料,综合分析认为该方法分辨率高、对低阻地质体反应灵敏,能够较好的解决采空区探测等地质问题,具有广泛的应用前景。

APPLICATION OF TRANSIENT ELECTROMAGNETIC METHOD FOR DETECTING GOAF OF A OLD MINE

Goaf detection of the old mine has been a difficult problem. This article, from the current perspective of the goaf detection method, analyzes the goaf geology and electrical characteristics, detects shallow goaf of the old coal mine in gansu hexi by transient electromagnetic method, and explains the low resistivity anomalies reasonably, selects the goaf boundary. Combined with 2D seismic interpretation results and other known information in this area, comprehensive analysis that this method is high resolution, sensitive response to low resistivity geologic body, and can better solve the problem of goaf detection such as geology, has wide application prospect.