基于小线圈瞬变电磁法的红沙泉矿区地下水资源探测
Groundwater resources detection based on transient electromagnetic system with small coils in Hongshaquan Mining Area
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摘要: 地下水环境与地表生态环境保护与修复密切相关，地下水资源探测是掌握地下水环境特征的重要内容。以红沙泉露天矿区生态修复为背景，以矿区钻孔地质柱状及电阻率测井曲线为基础，构建了4种不同的地电模型，基于一维正演理论，获得了小线圈瞬变电磁感应电压及视电阻率响应曲线。对比分析表明：不同含水地电模型条件下的感应电压及视电阻率对含水层的含水性响应敏感，且彼此在0.01～50 ms时间段内存在较为明显的差异，反映利用小线圈瞬变电磁方法对研究区地下水资源探测在理论上具备可行性。现场试验及钻探结果进一步验证了该方法在研究区地下水资源探测中的有效性以及可靠性。Abstract: Groundwater environment is closely related to the protection and restoration of surface ecological environment, and the detection of groundwater resources is an important content to master the characteristics of groundwater environment. In the setting of the ecological restoration of Hongshaquan Open-pit Mining Area, four different geoelectric models are constructed on the basis of geological column and its resistivity logging curves obtained by a borehole. Based on one-dimensional forward theory, the transient electromagnetic induced voltage and its apparent resistivity response curves with a small coil device are obtained. Comparative analysis for these curves shows that induced voltage and its apparent resistivity under different aquifer geoelectric model conditions are sensitive to aquifer water-bearing response, and there are obvious differences between them in 0.01-50 ms, which reflects the feasibility of using small coil transient electromagnetic method to detect groundwater resources in the study area in theory. Combined with the field detection test data and drilling exposure, the effectiveness and reliability of small coil transient electromagnetic technology in the detection of groundwater resources are verified.
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