Direct solution by 2-D and 2-D finite element method on forward problem of low frequency current fields in inhomogeneous media

摘要

The paper adopts finite element method to analyze the forward problem of low- frequency current fields in inhomogeneous media. Firstly, the direct solution of 2-D and 3-d scalar potential is given. Secondly, the technique of covering finite elements for problems with movement has been presented; namely, when the place of testing point moved, the meshing data will be produced automatically to avoid re-meshing and distortion of the mesh. Thirdly the free and prescribed potential method is used to make the finite element coefficient matrices. Then this paper provides the result of a validity test obtained by simulating the lateroolg-3 logging, compared with the numerical model-matching method. Finally, the MLL response is calculated.