Conectividade e compartimentação dos sistemas aqüíferos Serra Geral e Guarani no sudoeste do estado do Paraná, Brasil

Abstract

This study was conducted in the southwest portion of the State of Parana (53°00’/54°30’ W and 24°30’/26°12’ S), where basaltic lava flows from the Serra Geral Formation ( Serra Geral Aquifer System - SGAS) predominate and are superimposed to the Botucatu/Piramboia formations (Guarani Aquifer System - GAS). It shows the combined application of aeromagnetic, geological, structural (MDE, drainage system and satellite images), hydrogeological and hydrochemical data with the purpose of investigating the structural control and chemical properties of the SGAS (fractured). It also aimed to interpret, based on the hydrochemical properties of the SGAS and its structural outline, fractures that may represent zones of hydraulic connection between this aquifer and the GAS (granular). The aeromagnetic and orbital data integration allowing the composition of a magnetic-structural framework of the study area. Such framework, characterized by tendencies in the NW-SE, NE-SW and E-W directions, was compared to the spatial distribution of hydrogeological (potentiometry, outflow and specific capacity of exploitation – 181 wells) and hydrochemical parameters (pH, total dissolved solids, calcium, magnesium, sodium, potassium, bicarbonate, carbonate, chlorate and sulfate – 100 wells). All information of wells drilled were from SGAS. The hydrochemical results showed that calcium bicarbonated waters are more common, followed by sodium bicarbonated waters, mixed, magnesian and sulfated sodic. Calcium bicarbonated waters and magnesian were considered typical of the SASG, while the others were interpreted as a consequence of different levels of mixing with waters from other underlying aquifers.e integrated interpretation allowed for the recognition of the structural control of different levels of mixing with waters from other underlying aquifers.