瞬变电磁法在煤矿水文地质勘探中的应用

Application of Transient Electromagnetic Method in Coal MineHydrogeological Exploration

瞬变电磁法在地层中的穿透性较强,且信噪比和观测精度较高,被广泛应用于工程勘察及地质灾害调查等领域。探讨了煤矿的水文地质情况对于煤炭安全开采的影响,以霍尔辛赫煤业井田为研究对象,采用瞬变电磁法,对该煤矿水文地质特征进行分析,可以得知,不同脉冲磁场的发射频率对于地质勘测的影响较小,为提高勘测效率,可选择发射频率为5.0 Hz的脉冲磁场进行地质勘测。当观测距离较小时,采用瞬变电磁法得出的勘测深度较小,勘测效果及工作效率较低,当观测距离较大时,其勘测深度也较大,勘测的浅部信息质量较高,提升了工作效率,但是还存在一定的勘测盲区。为了保证此次的勘测效果,观测位选取距离井田钻孔360 m处,脉冲磁场发射频率设定为5.0 Hz。

Transient electromagnetic method is widely used in engineering investigation and geological hazard investigation because of its high penetrability,high signal-to-noise ratio and high observation precision.In this paper,the impact of the hydrogeological conditions of the coal mine on the safety of coal mining was discussed.Taking Huoerxinhe Coal Mine as the research object,the hydrogeological characteristics of the coal mine were analyzed using the transient electromagnetic method.It can be seen that different pulse magnetic field emission frequencies have little impact on the geological survey.In order to improve the survey efficiency,the pulse magnetic field with emission frequency of 5.0 Hz can be selected for geological survey.When the observation distance is small,the survey depth obtained by using transient electromagnetic method is smaller,and the survey effect and work efficiency are lower.When the observation distance is large,the survey depth is also large,and the shallow information quality of the survey is high,which improves work efficiency.However,there are still certain survey blind spots.In order to ensure the effectiveness of this survey,the observation site was selected at a distance of 360 m from the wellbore,and the pulse magnetic field emission frequency was set to 5.0 Hz.