Finite Element Method for IP Modeling on 3-D Geoelectric Section
Finite Element Method for IP Modeling on 3-D Geoelectric Section
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发表时间：
2003
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通讯作者：
Huang Jun-ge
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作者：
Huang Jun-ge
利用有限元法对三维地电剖面进行激电测深建模。首先，给出了三维结构上点源电场的三维边值和变化方程。然后，对无限边界的边界条件进行了简化，提高了计算速度和精度。在此基础上，计算了视电阻率与模型电阻率参数之比的偏导数矩阵，同时对三维地电剖面上的激电性进行了正模拟。与等效电阻率法相比，该模拟节省了大量的计算时间。对几种典型地电模型的试验表明，该建模方法是正确可行的。
FEM is used to modeling IP sounding on 3-D geoelectric section. First, this paper presents the 3-D boundary value and variation equation of point-source electrical field on a 3-D structure. Then, the boundary condition for the infinite boundary is simplified to improve calculation speed and precision. On this basis, the partial derivatives matrix for the ratio between the apparent resistivity and the model resistivity parameters is calculated, and at the same time, the IP on 3-D geoelectric section is positively simulated. Compared with equivalent resistivity method, this simulation saves much calculation time. The test of several relative typical geoelectric models shows that this modeling method is correct and feasible.