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如何得到快速稳定的反演结果和更清晰地重建地下电阻率结构等问题仍然是当前大地电磁反演研究的一个重点。在构制目标函数中采用正则化方法,使不适定反演问题具有稳定的反演结果,并改善解的稳定性和非唯一性;将光滑约束模型和近似灵敏度矩阵求解方法应用于反演过程中,快速稳定地构建地下电阻率结构。理论模型试算的结果表明光滑约束正则化反演方法是可行的,并能合理地重建地下三维电阻率结构。
How to get a fast and stable inversion result and how to reconstruct the underground resistivity structure more clearly is still one of the focuses of current research on the magnetotelluric inversion. In constructing the objective function, a regularization method is adopted to make the inversion of ill-posed problems have a stable inversion result and improve the stability and non-uniqueness of the solution. The smooth constraint model and approximate sensitivity matrix method are applied to the inversion process In the fast and stable construction of underground resistivity structure. The experimental results of the theoretical model show that the smooth constrained regularization method is feasible and can reasonably reconstruct the subsurface resistivity structure.