Métodos geofísicos integrados para a caracterizaç ão hidrogeológica dos aquíferos da microbacia Andes, Bebedouro, em São Paulo

Abstract

This paper presents the results of a geophysical survey integrated to well data for studying hydrogeological characteristics of Adamantina and Serra Geral Formations in a microbasin in the Andes District, in Bebedouro, state of São Paulo, Brazil. This area was the focus of studies due to the intense exploitation of groundwater for agricultural use and its relation with the increase of local seismic activity. In this paper, geophysical methods and well information were used, in an integrated way, to get more detailed knowledge of the aquifers and their physical properties. The results show that the approach was effective in imaging geological formations and their geometry study, as well as in the identification of geological structures. An estimation of hydrodynamic properties of granular aquifers can be done by the parameters of Dar Zarrouk and their correlation with data obtained from pumping tests. In this study, it was possible to establish a linear correlation between the transmissivity and transverse resistance, however with some limitations, because the majority of wells were drilled also in volcanic rocks. This procedure can be used to assist the aquifer management, under the aspects of exploration and preservation.