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CSAMT的工作装置和部分探测目标体的三维特性,决定了对CSAMT方法进行三维研究的必要性.在对三维三分量CSAMT方法有限元分析初探的基础上,应用了边界场值不为零的第一类边界条件,并将三维三分量的有限元分析退化为三维单分量来研究.研究结果表明:通过应用边界场值已知的第一类边界条件,缩小了研究范围,提高了计算精度;通过减少研究的分量,使计算速度大大提高;模型的模拟结果很好地说明了电磁场在地下传播中所具有的穿透性和体积效应.以上结果表明本文所用的边界条件有效,三维单分量的研究使计算时间大大减少,从而使本文发展的三维单分量电磁场有限元正演应用于电性介质接近于均匀的三维反演成为可能.
The three-dimensional characteristics of the CSAMT working device and part of the detection target determine the necessity of the three-dimensional research on the CSAMT method.On the basis of the first three-dimensional finite element analysis of the CSAMT method, A class of boundary conditions and the three-dimensional three-dimensional finite element analysis is decomposed into three-dimensional single component.The results show that: by using the first boundary conditions known boundary field value, narrow the scope of study and improve the calculation accuracy; The computational speed is greatly improved by reducing the component of the study, and the simulation results of the model well illustrate the permeability and volume effect of electromagnetic field in underground propagation.The above results show that the boundary conditions used in this paper are valid, the three-dimensional single component The research makes the calculation time greatly reduced, so that the three-dimensional single component electromagnetic field forward developed by this paper can be applied to the near-uniform three-dimensional inversion of the electric medium.