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时间域激电法2.5维正反演算法相对较成熟,但当实测数据量较大,正反演网格剖分较精细,以及傅氏反变换波数选取较多时,常规的反演算法计算效率低,影响了算法的实用性.本文讨论如何提高时间域激电法2.5维正反演计算效率问题.以“等效电阻率”为基础,利用有限单元法实现了激电法2.5维正演;采用正则化反演方法实现了2.5维激电数据反演;讨论了正反演算法的并行性,实现基于MPI的正反演并行计算;对正则化反演中拉格朗日乘子搜索方案进行了优化.经理论地电模型算例测试表明,所实现的正反演算法运行稳定,结果可靠,计算效率高.
The 2.5-D forward-inversion algorithm in time domain is relatively mature, but when the measured data is large, the meshes of the forward and inverse grids are subdivided, and the wave number of the inverse Fourier transform is more, the conventional inversion algorithm calculates the efficiency Low, affecting the practicality of the algorithm.This paper discusses how to improve the 2.5-D forward inversion calculation efficiency in the time-domain method based on the “equivalent resistivity ” method, using the finite element method to achieve the 2.5-D The inversion of 2.5-D data was carried out by using the regularization inversion method. The parallelism of the inversion algorithm was discussed, and the parallel computation of inversion and inversion based on MPI was implemented. For Lagrange multiplication of regularization inversion The sub-search scheme is optimized.Study on the geoelectric model of the theoretical test shows that the forward-reverse algorithm is stable, the result is reliable and the calculation efficiency is high.