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本文对电性联合反演进行了深入研究,以减少地球物理反演的多解性.将直流电阻率(DC)与大地电磁(MT)数据加入到同一反演数据集中.引入Tikhonov正则化思想建立反演目标函数,使反演过程更加高效稳定.在解决正则化反演问题过程中,分别采用了二阶最大平滑稳定因子和改进的L-curve法,提高了反演结果的稳定性和正则化因子的求取精度;最后运用非线性共轭梯度法(NLCG)对反演目标函数实现最优化求解.经研究表明:联合反演方法与单一反演方法相比,能够更加有效的约束反演模型范围;反演算法快速稳定,提高了反演精度,减少了对地下地质结构认识的模糊性.
In this paper, the in-depth study of the electrical joint inversion has been done to reduce the multiplicity of geophysical inversion, DC DC and MT data have been added to the same inversion dataset, and Tikhonov regularization The inversion objective function is established to make the inversion process more efficient and stable.In the process of solving regularized inversion problems, the second-order maximum smoothing stability factor and the improved L-curve method are respectively used to improve the stability of the inversion results and And then the non-linear conjugate gradient method (NLCG) is used to optimize the inversion objective function.The results show that the joint inversion method can be more effectively constrained than the single inversion method Inversion model range; the inversion algorithm is fast and stable, improve the accuracy of inversion, reduce the ambiguity of the understanding of underground geological structure.