Numerical Simulation, Based On Terrain Impact Of Ansys Induced Polarization Method

Currently, electrical exploration is very widely applied in various fields of national economy and social development. However, there are many problems encountered, especially the terrain effect. We know that the terrain effect on IP anomaly is much less than that on conductivity anomaly. However, the terrain effect must be considered in order to estimate and interpret IP anomaly correctly. Presently, there are many methods of terrain correction. A mass of numerical simulations for resistivity and IP methods are made by using ANSYS in this article, which is a software for finite element analysis. Then it is introduced of the terrain correction by ratio method. As we know, the finite element method suits to simulate models of irregular shape accurately. It is the commonly used method in geophysical numerical simulation.In this paper, we firstly review the study status of terrain effect in electrical exploration and sum up the existing numerical simulation methods of IP. And then we introduce the main functions of the finite element analysis software-ANSYS, the key steps and issues in IP numerical simulation. Afterward, we make a simple introduction about the boundary value and variation problems of point-source field. Many geoelectric models of resistivity and IP methods are calculated by using the corresponding programmes in APDL language offered by the software ANSYS itself, taking the terrains of ridge and valley as the examples. The rule of anomaly distribution on the condition of fluctuated terrain is summarized by validating and analyzing the calculated results. All above, we obtain some satisfactory conclusions.At the end, we have presented the suggestion that ANSYS can be widely used in geophysical forward modeling with valuable applications.