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首先对多种反演方法的特点进行介绍,然后分析比较以Bostick变换为初始模型的OCCAM反演和非线性共轭梯度反演,指出Occam反演对初始模型依赖性小但反演速度慢,非线性共轭梯度反演对初始模型依赖性大但反演速度快的问题,进而提出以Occam反演作为初始模型的非线性共轭梯度改进方案。实践证明,改进的组合反演算法简便、快速,成像效果好。最后,用改进方法对南涪线梓里隧道(DK92+406~DK97+023)的大地电磁资料进行了处理,其结果对褶皱、断层、岩溶等地质构造进行了较好的反应。
Firstly, the characteristics of many inversion methods are introduced. Then the OCCAM inversion and nonlinear conjugate gradient inversion based on Bostick transform are analyzed and compared. The results show that the Occam inversion has little dependence on the initial model but the inversion speed is slow, The nonlinear conjugate gradient inversion has a large dependence on the initial model but has a high inversion speed. Then, an improved nonlinear conjugate gradient method using Occam inversion as the initial model is proposed. Practice has proved that the improved combination of inversion algorithm is simple, fast, good imaging results. Finally, by using the improved method, the geomagnetic data of Ziyili Tunnel in South Fu Line (DK92 + 406 ~ DK97 + 023) are processed, and the results are good for the geologic structures such as fold, fault and karst.