用EH4电导率成像系统调查银川市月牙湖地区水源地

Investigation of Yueya Lake Area of Yinchuan City by EH4 Conductivity Imaging System

为了解银川市月牙湖地区地下水文地质情况,运用EH4电导率成像系统开展地面电法勘探工作;利用音频大地电磁测深剖面反演结果推断该地区含水岩组结构,并结合勘探钻孔系统解释了该地区含水岩组结构特征、地下水质分布及第四系厚度等。结果表明,研究区第四系厚度呈西厚东薄的特点;矿化度小于1 g/L的淡水分布在研究区北北东向I线区间;研究区中部偏东存在多条隐伏正断层,断层走向为北北东向,倾向西;研究区中部偏西为黄河古河道,走向大概为北北东向。

In order to understand the underground hydrogeology of Yueya Lake area in Yinchuan City,EH4 conductivity imaging system was used to carry out the surface electrical exploration.The inversion results of audio frequency magnetotelluric sounding section were used to infer the structure of the water bearing rock group in the area,and the structural characteristics of water bearing rock group,distribution of groundwater quality and the thickness of quaternary system were explained in combination with the exploration drilling system.The results show that the thickness of quaternary system in the study area is thick in the west and thin in the east.Fresh water with mineralization degree less than 1 g/L is distributed in the I-line section of the north-northeast direction in the study area.There are many hidden normal faults in the east of the middle of the study area,and the strike is of north-northeast direction with a west inclination.In west of the middle of the study area is the ancient Yellow River Channel with the strike of north-northeast direction.