Prospecção de água subterrânea no município de Novo Repartimento - PA aplicando métodos elétricos e eletromagnéticos

Abstract

This work was carried out in the rural area of the Belo Monte community in the Novo Repartimento county, localized in the SE of the Pará state. The geology of the area contains metamorphic and igneous rocks. In this geological context fractures are the only appropriate zones for groundwater storage. The objective of this work is to map those fractures. Preliminary Vertical Electrical Soundings (VES) and Radial Vertical Electrial Soundings (RVES) were carried out to determine the general fracture directions and the thickness of the overbunden. Subsequentely, HLEM profilings were carried out in directions orthogonal to the fractures. Also resistivity profiles using Wenner array and VLF profiles were carried out with the objective to compliment the HLEM data. The analysis of the all data revealed two hydrogeological domains: fractures in the crystalline basement and the overburden sediments. The later one being unsuitable for groundwater exploitation because of its small thickness, averaging 4 m. The interpreted fracture zones are NW-SE in the crystalline basement as associated to, seven conductor axes that were identified through HLEM profiles, supplemented by VLF and resistivity profiles. As a result of this work we indicate five promissory locations for wells to be drilled for groundwater exploitation.