高密度电法勘探方法应用探讨——以宜昌某地区1∶5万区域地质调查项目为例

Application and Research of High-density Resistivity Method in Regional Geological Survey

为查清测区内第四系地层厚度以及界面位置,本次采用高密度电法作为勘探手段。为达到最佳的勘探效果,在工作正式开展之前,在调查区内进行“温纳”和“斯伦贝谢”两种常用测量装置的对比实验。通过数据质量和测量效果的分析,“温纳”装置更适合本次地质调查工作,其实测数据反演结果与钻孔资料吻合较好。总之,“温纳”装置能够较准确地确定第四系地层界面和厚度,具有较强的水平分层能力,可以为厚覆盖区开展地质填图等区域地质调查工作提供参考依据。

The main task of this regional geological survey is to determine the Quaternary stratum thickness and interface location,high density resistivity method is chosen as a prospecting tool.In this paper,the basic principle of high density resistivity method is summarized.The comparative experiments of two commonly used measuring devices,Wenner and Schlumberger,are carried out in the investigation area.Through the analysis of data quality and measuring effect,the Wenner device is more suitable for the geological survey.The inversion results of measured data are in good agreement with the borehole data.The results indicate that Quaternary stratum interface and thickness can be accurately determined by high density resistivity method.Winner device has higher horizontal stratification ability than Schlumberger device.Through this work,it illustrates that the high density resistivity method has good effect in regional geological survey,and the interface and thickness of Quaternary strata are identified,which provides a basic reference for regional geological survey.