基于自适应有限元的复电阻率法2.5维复杂构造电磁场模拟  

2.5D simulation of the electromagnetic field with complicated structure in the complex resistivity method using adaptive finite element

作　　者：徐凯军[1] 李猛 XU KaiJun;LI Meng(School of Geosciences , China University of Petroleum （East China）, Qingdao 266580, Chin)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,青岛266580

出　　处：《地球物理学报》2018年第7期3102-3111,共10页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(41304094);国家"863"计划项目(2012AA09A20107)联合资助

摘　　要：复电阻率法在矿产、油气勘探调查中发挥着重要作用.为了认识复杂构造的复电阻率法电磁场的变化规律,本文基于自适应有限元方法,采用非结构化网格,引入Cole-Cole模型,实现了电偶源2.5D复电阻率法电磁场正演,可以模拟复杂地形和地电结构,正演结果更符合野外实际地质情况.通过将本文的计算结果与半空间模型解析解、层状介质和起伏模型结果进行对比,验证了本文算法的正确性.最后,基于复杂地电模型,通过正演模拟,系统分析了地形、激电参数、复杂构造对复电阻率法电磁场的影响特征.The complex resistivity method plays an important role in exploration of minerals,oil and gas.In order to better understand the variation law of the electromagnetic field with complex structure for the complex resistivity method,we introduce the Cole-Cole model into the electromagnetic equation.Then we use the adaptive finite element method based on an unstructured grid to simulate the responses of electric dipole 2.5 Dcomplex resistivity.We adopt this method,because it can simulate the complex terrain and underground structure,and the forward modeling results are more consistent with actual geological conditions.We compare our results with both the analytical results and those from the literature.It is verified that the algorithm is accurate.Based on the complex geoelectric model,we analyze the influence of terrain,induced polarization parameters and geoelectric structure on the electromagnetic field in the complex resistivity method by forward modeling.

关 键 词：复电阻率 自适应有限元 激电效应 2.5维 复杂构造 

分 类 号：P631[天文地球—地质矿产勘探]