瞬变电磁法和激光雷达扫描微动勘探联合探测煤层富水区的应用

Application of transient electromagnetic method and LiDAR scanning micro-motion exploration in joint detection water-rich areas of coal seam

地下水在岩石中流动时,会对岩石产生物理和化学作用,如溶蚀、侵蚀和搬运作用,这些作用会加剧岩石的裂隙化和断层的活动,导致煤层富水区勘探难度增加。而通过瞬变电磁法精确测量地下介质对电磁脉冲的响应,结合激光雷达高精度监测地表高程变化和微小震动,可以实现对深部和复杂地质条件下煤层富水区的精确识别与地表形变预测。以国能榆林能源郭家湾煤矿为例,研究瞬变电磁法和激光传感微动勘探联合探测煤层富水区的应用。根据岩层分布深度在地表搭建电磁信号发射装置,通过介质反射扩散原理来探测视电阻率变化,获取实时感应到的电阻率变化数据。利用激光雷达扫描的数据,得到补充的微动勘探短剖面。结合电阻率的变化和微动勘探短剖面,进行联合分析,以约束电阻率的特征与微动勘探短剖面的分析。根据分析结果,可以精确划定煤层顶板的富水区范围,实现煤层顶板富水区勘探。实验结果表明,这种联合方法能够很好地分析煤层顶板的富水性,对煤层顶板富水区分布勘探结果与实际结果完全一致,勘探精度达到100%。因此,联合勘探方法具有良好的应用效果,实际应用价值较高。

When groundwater flows in rocks,it will have physical and chemical effects on the rocks,such as dissolution,erosion,and transport effects.These effects will intensify rock fissures and fault activity,leading to increased difficulty in exploring coal water-rich areas.By using transient electromagnetic method to accurately measure the response of underground media to electromagnetic pulses,combined with high-precision monitoring of surface elevation changes and small vibrations by laser radar,precise identification of coal seam water-rich areas in deep and complex geological conditions and prediction of surface deformation can be achieved.Therefore,taking Guojiawan Coal Mine of CHN Energy Yulin Energy as an example,the application of transient electromagnetic method and laser sensing micro motion exploration combined to detect coal seam water-rich areas was studied.According to the depth of rock layer distribution,an electromagnetic signal transmission device was built on the surface to detect changes in apparent resistivity through the principle of medium reflection and diffusion,and obtain real-time sensed resistivity change data.Supplementary micro motion exploration short profiles was obtained by using data scanned by laser radar.Combining the changes in resistivity and micro motion exploration short profiles,a joint analysis was conducted to constrain the characteristics of resistivity and the analysis of micro motion exploration short profiles.Based on the analysis results,the range of water-rich areas of the coal seam roof can be accurately delineated,achieving exploration of water-rich areas in the coal seam roof.The experimental results show that this joint method can effectively analyze the water-rich properties of coal seam roof,and the exploration results of the distribution of water-rich areas in coal seam roof are completely consistent with the actual results,with an exploration accuracy of 100%.Therefore,it indicates that the joint exploration method has good application effects and high practical application value.