可控源音频大地电磁法在采空区探测中的应用

Application of Controlled Source Audio Magnetotelluric Method in the Exploration of Goaf

摘要:

简述了采空区的危害和形成原因，介绍了可控源音频大地电磁法的概念及该方法的特点，综合分析了正常地层和采空区的地球物理特征，通过数值模拟图件说明了采空区的视电阻率特征。该文以可控源音频大地电磁法在济宁何岗煤矿和平邑左庄石膏矿采空区探测的应用为例，通过对比完整地层视电阻率拟断面图和采空区域视电阻率拟断面图的差异，得到了采空区域的电性响应情况，综合分析采空范围特征。经矿方验证，证明可控源音频大地电磁法在采空区范围探测中探测效果好，提供的资料准确可靠。

Abstract:

The harm，causes of the goaf, the characteristics and the concept of controlled source audio frequency magnetotelluric method have been introduced in this paper. The normal strata and geophysical characteristics of goaf have been analyzed comprehensively. Through numerical simulation maps, apparent resistivity characteristics of goaf has been illustrated. Based on application of controlled source audio frequency magnetotelluric method in Hegang coal mine in Jining city and Zuozhuang gypsum mine goaf in Pingyi county, comparing the differences between pseudo cross section diagram of apparent resistivity in complete strata and in mined out region, the electrical response condition has been gained, and the scope characteristics has been analyzed comprehensively. It is proved that the controlled source magnetotelluric method has a good detection effect in the detection of mined out area.