Application Study Of High-density Resistivity Imaging Method In The Quaternary Lithology Of Juye River Basin

The geological survey aims to identify the geological conditions,geological structures,and available geological resources in the study area.With the advancement of China's industrialization and urbanization,the development and utilization of urban underground space in China has entered a stage of rapid growth.The 21 st century is the century of "underground space".How to use the limited space underground to a greater extent has been a problem that researchers at home and abroad have been troubled by.At present,the use of underground space in China is still in the pre-middle stage.Quaternary sediments are mostly,it is important to recognize the spatial distribution,thickness and burial depth of the Quaternary strata.In this paper,the Juye River Basin is used as the research area.In order to find out the distribution characteristics of the Quaternary strata in the study area,and to study the characteristics of the electrical differences between the rock and soil layers in the study area,the high-density resistivity imaging method is used to carry out the Quaternary formation The exploration,combined with the existing geological data and drilling data,analyzed the resistivity method map from the perspective of the physical parameter of resistivity to obtain a two-dimensional resistivity geological model,and then analyzed and analyzed the distribution of known Quaternary formations.Three-dimensional geological model of the study area.The main conclusions reached are as follows:1.The Quaternary stratum in the study area is mainly composed of clay,sand,gravel,and cemented conglomerate.The clay layer is reflected by low resistance on the resistivity map.The high resistance reflects that the inversion results are basically consistent with the information about the depth and thickness of the stratum exposed by the boreholes,thus providing reference basic geological data for subsequent geological surveys.2.In the obtained resistivity images,silty clay and clay are low-resistance areas.The resistivity of silty clay is between 0-12 ?·m,and the resistivity of clay is between 12-14?·m.The sand layer is medium to high.The resistivity range has a resistivity range of 14-17?·m;sand and gravel are high-resistance ranges with a resistivity range between 17-30?·m.3.Based on the two-dimensional high-density resistivity imaging exploration imaging,a three-dimensional geoelectric model is realized through spatial regionalization,which can better reflect the distribution characteristics of the Quaternary stratum in the study area,but for smaller clay blocks and gravel soil models Can not be reflected,it has a good reflection on continuous layered geology.4.Comparing high-density resistivity inversion images with geological models,and combining previous geological data and borehole data,it can be determined that the quaternary strata in the study area are clay,sand,and conglomerate layers in order from top to bottom.The buried depth of the clay layer is generally in the range of 0 ~ 50 m underground,the buried depth of the sand layer is generally in the range of 50 ~ 80 m underground,and the conglomerate basically exists in the range below 80 m.