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研究复杂地电模型上的井地电法三维反演一直是一个具有挑战性的课题。本文在准解析近似和重加权正则化的共轭梯度法的基础上,用visualFortran6.5开发了井地电法三维准解析近似反演程序。反演过程中的正演和Frechet导数矩阵计算都应用准解析近似大大提高了计算的速度。通过理论模型的合成数据反演试算,说明基于准解析近似法和加权正则化的共轭梯度法的井地电法三维反演程序有着计算速度快,反演精度高等特点。
It is always a challenging task to study 3D inversion of well-ground electrical method in complex geoelectric models. Based on the quasi-analytical and regularization weighted conjugate gradient method, this paper develops a 3D quasi-analytical approximate inversion program of well-ground electrical method with visual Fortran 6.5. Applying quasi-analytical approximations to both forward modeling and Frechet derivative matrix calculations in the inversion process greatly increases computational speed. Based on the theoretical model, the inversion of the synthetic data shows that the 3D inversion method based on the quasi-analytical approximation method and the weighted regularization conjugate gradient method has the advantages of fast calculation speed and high inversion precision.