Inversão 1D e 2D de dados do método eletromagnético a multi-frequência - EMMF

Abstract

In this work is presented the rst study of data inversion from Electromagnetic Multi- Frequency Method (EMMF). In its rst part is made a presentation of the mathematical techniques used for inversion of these data. It will be shown the Gauss-Newton technique with modied Marquardt algorithm and a description of two regularization methods used in the inversion, which are Global Smoothness method (GS) and Total Variation method (TV). In the second part, they are applied to 1D inversion of EMMF synthetic data as well as are applied to real data, that were acquired in the Esprito Santo Basin, southeastern Brazil. In the third and last part, it presented the 2D inversion of EMMF synthetic data, with models, which like the 1D inversion, involving conductive and resistive targets. Results of this study show that the inversion of data from conductive targets was able to recover the resistivity structures more consistently with the true resistivity model than in the case of resistive targets. This may be due to the fact that the purely inductive radial magnetic component is naturally more strongly in uenced by conductive than by resistive regions in the geoelectrical medium.