Research On The Influencing Factors Of Resolution Of High Density Resistivity Method And Its Application

High-density resistivity method is an exploration method developed on the basis of conventional direct current resistivity method exploration,and its essence is still the direct current resistivity method.In high-density resistivity method exploration,there are many problems that need to be improved and solved,such as power supply problems under complex geological conditions,exploration depth issues,quantitative interpretation problems,resolving power,and so on.Reflected in the inversion diagram,these problems can be attributed to the resolution problem.The study of resolution can find solutions to these problems.For the high-density resistivity method in the study of resolving is still lacking,when the need for fine resolution anomaly and quantitative interpretation,its vertical resolution,horizontal resolution of the factors must be fully discussed and analyzed.Based on the basic theory of DC method,this paper studies the forward modeling and inversion techniques of high-density resistivity method,and verifies the accuracy of the self-programming program through self-programming and professional software for numerical simulation analysis.By analyzing the sensitivity of each array,the detection characteristics,depth of detection,and resolution.The main factors influencing the resolution of the high-density resistivity method are the difference in resistivity of the anomalous body and surrounding rock,the electrode distance,and the depth of anomalous body.Abnormal body size these four factors.In this paper,the horizontal and vertical resolution of the high-density resistivity method are respectively analyzed in detail.The influence of the four influences on the resolution of a single anomaly body,multiple anomaly bodies,an infinitely-extended vertical anomaly body,and an infinitely-extended horizontal anomaly body is analyzed in detail.The three arrays are discussed separately.Then the four factors were normalized,and the influence degree of the four influencing factors was analyzed.It was concluded that the buried depth was 0m~5m,the abnormal body size was 1m~5m,and the difference in resistivity was 0.1~10.The change in electrode spacing and depth has the greatest effect on horizontal and vertical resolutionIn this paper,the comprehensive analysis of the horizontal and vertical resolution of the high-density electrical method shows that the three factors have basically the same influencing factors,and the horizontal and vertical influences are basically the same;and the overall influence of the influencing factors on the vertical resolution is even greater.After analyzing the overall resolution and discussing the degree of influence of various factors,it is proposed that the buried depth is 0.5m~3.5m,the anomaly size is 1.5m~4.5m,and the difference between the resistivity of the anomaly body and surrounding rock is 0.1~7.Within the range,the electrode distance gradually decreased from 3.5m to 0.5m,which can greatly improve the overall resolution of the high-density electrical method.In the process of changing the electrode distance from 0.5m to 1.5m,the ? array can increase the detection depth based on the maximum resolution and achieve the best geological effect.The study of resolution should link theory with practice,and guide practical work through theoretical research.The problems faced by practical work will promote more in-depth study of the theory.Finally,the horizontal,vertical and overall resolution analysis of this paper is applied to the engineering examples.Taking the pipeline detection and underground cavity detection as examples,the correctness and practicability of the discussion and analysis in this paper are verified.Through theoretical analysis and engineering examples,this research can provide a certain data base for the resolution research of high-density electrical methods,and can obtain better geological results and improve work efficiency and effectiveness.