不同反演参数对高密度电阻率二维反演结果的影响  

Different inversion parameters on 2D inversion results of high density resistivity

作　　者：郭鹏 刘海飞[1,2] 刘声凯[3] 柳建新 张一凡[1,2] 李昶萱 GUO Peng;LIU Hai-fei;LIU Sheng-kai;LIU Jian-xin;ZHANG Yi-fan;LI Chang-xuan(School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Key Laboratory of Non-Ferrous Resources and Geological Hazard Detection,Central South University,Changsha 410083,China;Hunan Institute of Hydrogeology and Environmental Geology,Changsha 410129,China)

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]中南大学有色资源与地质灾害探查湖南省重点实验室,长沙410083 [3]湖南省水文地质环境地质调查监测所,长沙410129

出　　处：《桂林理工大学学报》2022年第3期572-579,共8页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(42130810;41774149);湖南省自然科学基金项目(2020JJ4694)。

摘　　要：在高密度电法勘探中,通常借助电阻率二维反演断面进行地质推断解释,然而电阻率反演结果常因反演参数选择的不同而存在差异,在很大程度上影响地质推断解释的准确性。针对高密度电阻率二维反演如何选取合理的反演参数问题,选取两种观测装置的实测视电阻率断面作为试验断面,测试正反演网格大小、模型约束条件、偏导数矩阵的计算方法、目标函数的范数、初始阻尼因子、反演迭代次数等参数对反演耗费时间和反演分辨率的影响。通过反演测试发现,网格剖分、模型约束及阻尼因子对反演的分辨率影响较大,偏导数矩阵的计算方法及反演迭代次数对反演的耗时影响大;当数据断面含有突变噪声时,数据空间和模型空间可选取L_(1)范数。In high-density electrical exploration,geological inference and interpretation are usually carried out with the aid of two-dimensional resistivity inversion sections.However,the results of resistivity inversion are often different due to the selection of inversion parameters,and greatly affect the accuracy of geological inference and interpretation.In order to explore good inversion parameters for high-density resistivity two-dimensional inversion,in this study measured apparent resistivity sections of two observation devices are used to test the influence of parameters,such as forward and inversion grid size,model constraint conditions,partial derivative matrix calculation method,norm of objective function,initial damping factor,and inversion iteration number on inversion time and inversion resolution.Through inversion tests,it is found that meshing,model constraints and damping factors have great impact on the resolution of the inversion.The calculation method of the partial derivative matrix and the number of inversion iterations have much impact on the time-consuming inversion.When the data section contains mutational noise,the L_(1) norm can be selected for the data space and the model space.The experimental results can provide reference for the two-dimensional inversion of high-density resistivity.

关 键 词：高密度电阻率法 二维反演 反演参数 反演分辨率 反演耗时 

分 类 号：P319.32[天文地球—固体地球物理学]