【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。更多还原

【Abstract】 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.更多还原