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.

Key words: induced polarization method, tetrahedron element, three dimension numerical simulation, complicated terrain, electricfields