高密度电法和瞬变电磁法在转龙湾煤矿富水区探测中的应用

Application of High-density Electrical Method and Transient Electromagnetic Methods in the Detection of Water-rich Areas in the Zhuanlongwan Coal Mine

为防治转龙湾煤矿Ⅱ-3煤层开采发生矿井水害,采用高密度直流电法和瞬变电磁法综合探测煤矿富水区,能弥补高密度直流电法探深浅、瞬变电磁法存在浅层盲区的不足,同时兼顾浅部和深部的富水区勘探要求。首先通过两种物探数据的反演对比,得到研究区内L1、L2、L3三条高密度测线位置200 m以浅不同深度电性分布特征,结果基本一致,降低了物探解释多解性。然后据此对全区进行物探综合解释,发现Ⅱ-3煤层顶、底板存在多处与围岩有明显电性差异的相对低阻异常区域,结合地质和钻孔资料,将其推测为砂岩富水地段,其低阻成因很可能是砂岩裂隙含水所致,而富水区的高阻特征则很可能是砂岩弱含水和不含水的反映。最后基于以上电性特征,在研究区内成功圈定出7处富水区域,结合水文资料,认为其中4处富水区表现为中等富水性,其他3处表现为弱富水性,这些富水区的分布受层内断层所控制。本次研究对矿区煤层的顺利开采有重要的指导意义。本次研究对矿区煤层的顺利开采有重要的指导意义。

In order to prevent the mine water damage in the mining of theⅡ-3 coal seam of the Zhuanlongwan coal mine,the high-density direct current method and the transient electromagnetic method are used to detect the water-rich areas of the coal mine,which can make up for the deficiencies of the high-density direct current method in detecting shallow depths and the transient electromagnetic method in detecting shallow blind areas,while taking into account the requirements of the water-rich areas of shallow and deep exploration.Through the inversion comparison of the two types of physical data,the results of the electrical distribution characteristics of the three high-density lines in the study area are basically the same at different depths of 200m in L1,L2 and L3,which reduces the multi-interpretation of physical exploration.Accordingly,the comprehensive physical interpretation of the whole area finds that there are several areas of relative low resistance anomalies in the top and bottom ofⅡ-3 coal seam with obvious electrical differences from the surrounding rocks.Based on the above electrical characteristics,seven water-rich areas are successfully circled in the study area,and combined with the hydrological data,four of the water-rich areas are considered to be moderately water-rich,and the other three are weakly water-rich,and the distribution of these water-rich areas is controlled by intra-layer faults.