2.5-D forward numerical simulation of ip method in time domain under the condition of undulate terrain

摘要

The 2.5 -D forward modeling of polarizability can be transformed into the numerical simulation of "equivalent apparent resistivity" by cole -cole model. The underground space is divided by parallelogram in order to simulate the terrain. Both of the finite element method and the boundaty element method are used in the 2.5 -D forward modeling of resistivity and polarizability in ridge and valley terrain in order to improve the accuracy of simulation. Compared with the results without terrain, the results here show that there is a greater impact on the numerical simulation of the resistivity, and the apparent resistivity quasi sectional drawings have a false anomaly in the place of the terrain undulated, while the curve shape of the apparent polarizability change not so much, only the amplitude and range of the curve changed above the anomaly. The more drastic changes in terrain, the greater the apparent resistivity and the apparent polarizability change.