复杂地形条件下激发极化有限单元法三维数值模拟  

Three-Dimension Numerical Simulation of Induced Polarization & Finite Element Method Under Complicated Terrain

作　　者：林家勇[1,2,3] 汤井田[1] 丁茂斌[1] 杨晓弘[1] 杨树云 

机构地区：[1]中南大学信息物理工程学院,长沙410083 [2]云南省地质调查院物化探勘查所,云南宜良652100 [3]云南省地质矿产开发局地球物理地球化学勘查队,云南宜良652100

出　　处：《吉林大学学报（地球科学版）》2010年第5期1183-1187,共5页Journal of Jilin University：Earth Science Edition

基　　金：国家科技支撑项目(2006BAB01A07)

摘　　要：野外激电勘查过程中,据激电异常进行钻探验证时,常发生验证目标矿体擦边而过现象。究其原因是在实际勘查中,地形的起伏变化改变了地下电场的分布规律,导致激电异常发生位移及幅值改变。为了改善、克服这种现状,必须从理论上进行研究。运用四面体单元三维有限单元数值正演计算方法对此进行了理论研究,选用典型山谷地形水平层状极化体模型进行数值模拟计算。研究结果表明:①起伏地形不产生假的激电异常,仅对激电异常的形态和幅值产生影响;②采用四面体剖分单元有限单元法研究复杂地形条件对激电异常的影响是行之有效的。It often occurs that drilling according to IP anomaly missed the target.The reason is that in the actual survey,terrain changed the underground electric field,therefor changed and shifted the amplitude of IP anomaly.In order to overcome this problem,three-dimensional tetrahedral finite element numerical method is employed.We prudently selected and simulated a typical geological model.The results show that：①Undulating terrain does not produce a fake IP anomaly,only has an impact on the distribution pattern and the amplitude of IP anomaly;②The tetrahedral finite element method is feasible and effective for the IP simulation under a complicated terrain condition.

关 键 词：激发极化法 四面体单元 三维数值模拟 复杂地形 电场 

分 类 号：P631[天文地球—地质矿产勘探]