物探技术在城镇水源地勘查中的应用研究与实践OA

In this study,the physical parameters of Dayugou area,Muer Town,Zhuoni County were measured by using DZD-8 multi-function DC electric instrument.Combined with geological data and hydrological information,the corresponding resistivity variation range of the main rock types in the area was determined.Through the high-precision apparent resistivity profile measurement,the hydrogeological conditions and geophysical properties of the study area are deeply analyzed in order to accurately describe the characteristics of the regional underground structure,the bedrock surface distribution and the occurrence state of the water-rich geological body.The results show that the sand-gravel layer formed by Quaternary alluvium not only has excellent water storage performance,but also has relatively high resistivity,while the water-bearing performance of Middle Triassic sand slate is poor and the resistivity decreases obviously.Through the fine processing and interpretation of the collected test section data,it is successfully determined that the groundwater is mainly stored in the shallow Quaternary sand gravel layer,and its thickness is estimated to be between 5 and 20 meters.In addition,the geoelectric anomaly corresponds to the location of the fault fracture zone,indicating that the tectonic activity leads to a sharp decrease in resistivity in this area,forming an obvious abnormal area of low resistivity.The interpretation results of this study are highly consistent with the geological measured data and borehole observation records,which confirms the effectiveness and reliability of the geophysical exploration method in revealing groundwater resources and evaluating the geological environment.This achievement not only provides a solid scientific basis for the development of water resources in the study area,but also sets a reference example for the exploration,development and utilization of water resources under similar geological background.It further highlights the important position and wide application value of high-density resistivity method in modern geological exploration practice.