基于Res3dinv软件的三维高密度电法成像效果分析  

Analysis of the Effect of Three-dimensional High-density Electrical Imaging Based on Res3dinv Software

作　　者：王钧 朱国维[1] Wang Jun;Zhu Guowei(School of Geoscience Earth Science and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083

出　　处：《工程地球物理学报》2022年第1期117-125,共9页Chinese Journal of Engineering Geophysics

基　　金：国家重点研发计划项目(编号:2018YFC0807800);“越崎杰出学者专项资金”项目(编号:800015Z1208)。

摘　　要：三维高密度电法基于地下介质电性的差异,能对地层中存在的空间视电阻率变化特征进行探测。为了对其成像效果进行分析,本文首先基于正反演理论介绍了有限差分法、有限元法,以及光滑约束最小二乘法的原理。然后在Res3dinv软件中选择单极-偶极装置进行三维反演成像,具体分析了异常体埋深、尺寸大小、高低阻互换、形状边界,以及地形起伏不平带来的反演成像变化,得到了异常体的响应规律,说明了在实际工作中应当注意探测的体积边界效应以及反演过程中误差的控制问题。算例与实例结果均表明,三维高密度电法可以对可能存在的地质体空间电阻率异常进行反映,但要注意多解性现象。为更好地圈定异常体的位置和范围,应当加强高密度电法正反演精度以及开展多方法分析或联合反演的研究。Based on the difference of electrical properties of underground medium,three-dimensional high-density electrical method can be used to detect the variation characteristics of spatial apparent resistivity in the stratum.In order to analyzetheimaging effect,this paper firstly introduces the principle of finite difference method,finite element method,and smooth constrained least square method based on forward and inversion theory.Then,a monopole-dipole device is selected in Res3dinv software for three-dimensional inversion imaging,and the depth,size,high and low resistance interchange,shape boundary,and inversion imaging changes caused by the uneven terrain areanalyzed in detail,and the response law of the abnormal body is obtained.The law shows that in actual work,attention should be paid to the volume boundary effect of the detection and the error control problem in inversion process.Both the calculation example and the actual results show that the three-dimensional high-density electrical method can reflect the possible spatial resistivity anomalies of geological bodies,but more attention should be paid to the illusion of multiple solutions.In order to better delineate the location and range of the anomaly,the forward and inversion accuracy of the high-density electrical method should be strengthened and research on multi-method analysis or joint inversion should be carried out.

关 键 词：三维 有限差分 有限元 最小二乘 反演成像 

分 类 号：P631.3[天文地球—地质矿产勘探]