激发极化法在城市地质调查中的应用

Application of induced polarization method in urban geological survey

在河南省某市城市地质调查的地面物探工作中,地质任务为圈定区域内含水区域。截至目前,物探方法找水除核磁共振法外都属于间接找水。结合该区地质情况,选用激发极化法开展工作,工作中对视电阻率和极化率2个参数结合地层情况进行了对比分析。第四系及新近系含水层主要为砂砾石层,主要特征为视电阻率相对较高,极化率相对较高。根据特征,划定了工作区范围内含水区域。通过2处钻孔验证,强富水区含水层厚度达70m,出水量在2000m^3/d。通过本次工作,说明在地下水普查的工作中,激发极化法是一种有效的方法。

In the ground geophysical survey of urban geological survey in a city of Henan Province,the geological task is to delineate the water-bearing area in the area.Up to now,geophysical methods to find water in addition to nuclear magnetic resonance were indirect water seeking.In combination with the geological conditions of this area,the intensified polarization method was selected to carry out the work.In the work,the two parameters of apparent resistivity and polarizability were compared and analyzed.The quaternary and neogene aquifers were mainly sand gravel layers.The main features were relatively high apparent resistivity and relatively high polarizability.According to the above features,the water-containing area within the working area was delineated.Through two holes verification,the thickness of the aquifer in the strong water-rich area was 70 meters,and the water output was 2 000 m 3/d.Through this work,it is showed that in the work of groundwater survey,the method of inducing polarization is an effective method.