Estimation of Petrophysical Parameters of Granular Materials, Applying an Amplitud Inversion From GPR Data: Case Study Irapuato, GTO., Mexico

Abstract

For the development of this work an unconventional technique to estimate the spatial distribution of petrophysical parameters was applied. The inversion of the amplitude is applied to the GPR data for estimating reflectivity, the used algorithm requires preconditioning of the data by conventional processing techniques. The proposed inversion algorithm, operating with band matrices, had shown to be computationally more efficient than the conventional methods of inversion. The spatial distribution of physical properties is estimated by a recursive calculation technique, with the constraint of having information of the near surface lithological sequence. Petrophysical parameters are estimated by applying an empirical relationship between electrical and physical properties of the subsoil granular materials, similar to those studied during the development of this work. The methodology for the analysis of GPR records proposed in this paper was used for the characterization of a study site, with available lithological information from a geotechnical borehole. GPR profiles obtained by the inversion proposed method show that the simulated stratigraphy corresponds to the lithological sequence at the study site.