TWO DIMENSION RESISTIVITY TOMOGRAPHY USING THE FINITE ELEMENT METHOD
二维电阻率成像的有限元解法

In order to verify the reliability of resistivity tomography by tracing the electric current ray, the research of 2D resistivity tomography using the finite element method is completed. The work is done from three aspects. First, the reverse FEM equations with artificial boundary terms are derived, and their advantages and shortages are pointed out compared with the method of tracing electric current ray. Second,through solving the reversed coefficient using the method of section by section and using the sparse and symetrial property of the coefficient, the computing time and computer memory are saved. At last, the reverse equations are solved,by the improved Gauss-Sadal iteration method. The results of model simulation are much reliable.