综合电法在煤矿采空区探测中的效果分析

The Application of Comprehensive Electric Method to the Detection of Coal Mine Goaf

为了探明某气井平台及周围地下煤矿采空区与断裂破碎带等分布情况,根据目标体与围岩电物性差异较为明显特点,宜采用物探电法探测。结合采空区特征和各物探方法的适用条件,宜采用高密度电法、瞬变电磁法和音频大地电磁法三种电法组合使用。对该工程实例物探解译,80m以浅深度范围内探测宜采用高密度电法成果为主,音频大地电磁法为辅,中、深深度范围内宜采用瞬变电磁法与音频大地电磁法成果。综合分析各方法成果,该平台地下不存在采空区、不良地质体和构造,为后续气井安全施工提供了依据。

This study applies high-density electrical method, transient electromagnetic method and audio-frequency magnetotelluric method to the detection of the distribution of coal mine goaf and fractured zone according to difference of object from wall rock in electric and physical properties. High-density electrical method aided by audio-frequency magnetotelluric method is used for detecting the distribution of coal mine goaf and fractured zone in the depth less than 80 m. Transient electromagnetic method and audio-frequency magnetotelluric method are used for detecting the distribution of coal mine goaf and fractured zone in the medium depth and depth.