基于音频大地电磁法与高密度电法的矿山选厂地下水勘察  

Groundwater Investigation Based on Audio Magnetotelluric Method and Electrical Resistivity Tomography at Mine Separation Plant

作　　者：姚文 蒋伟 周洪兵 陈遥坤 Yao Wen;Jiang Wei;Zhou Hongbing;Chen Yaokun(Sichuan Institute of Metal Geological Survey,Chengdu Sichuan 611730,China;The School of Geophysics,Chengdu University of Technology,Chengdu Sichuan 610059,China)

机构地区：[1]四川省金属地质调查研究所,四川成都611730 [2]成都理工大学地球物理学院,四川成都610059

出　　处：《工程地球物理学报》2023年第5期605-612,共8页Chinese Journal of Engineering Geophysics

基　　金：四川省地质调查研究院科研基金(编号:SDDY-Z2022017)。

摘　　要：西藏巨龙铜矿矿山选厂地下水水文抬升,存在影响选厂安全生产风险,为了划分出重点勘察区的地质构造形态、第四系厚度、含水地段及预测地下水的富集部位,开展音频大地电磁法和高密度电法两种地球物理勘查方法的结合。通过方法试验,优选该地区适用的测量技术参数,音频大地电磁法测点使用有效观测频带为19 983.3~2.5 Hz,并且多次叠加处理;高密度电法选择温纳排列测量,保证数据采集质量。反演解译划分出低阻异常体8处,针对异常通过4个水文钻孔(ZK1、ZK2、ZK4和SW4)验证,钻孔揭露的浅地表破碎区域和地下水重要含水地段,与地球物理低阻异常形态和位置基本吻合。两种方法的成果实践运用,为解决地下水水位异常的处置提供了层位依据,保障了矿山选厂的安全生产。The hydrology rise of groundwater in the beneficiation plant of Juolong Copper Mine in Tibet has the risk of affecting the safety production.In order to classify the geological structure forms,the thickness of the quaternary system,the water-bearing section and the prediction of the enrichment of groundwater in the key investigation area,the combination of the audio magnetotelluric method and electrical resistivity tomography is carried out.Through the pilot study,the applicable measurement technical parameters in the area are optimized.The effective observation frequency band of the audio magnetotelluric method measurement frequency measures 19 983.3 ~ 2.5 Hz,with multiple superposition processing.The electrical resistivity tomography selection of Wenner alignment measurement is adopted to ensure the quality of data acquisition.Eight low-resistivity anomalies are classified by inversion interpretation.Four hydrology boreholes(ZK1,ZK2,ZK4 and SW4) are used to verify the anomalies.The shallow surface broken area and important water-bearing section of groundwater exposed by boreholes are basically consistent with the shape and location of geophysical low-resistivity anomalies.The practical application of the results of the two methods provides the horizon basis for solving the disposal of groundwater level anomaly,and guarantees the safe production of mine concentrator.

关 键 词：音频大地电磁法 高密度电法 地下水勘察 钻孔验证 

分 类 号：P631.3[天文地球—地质矿产勘探]