Análise das relações entre parâmetros geolétricos e vazões para o aquífero livre de Caçapava do Sul - RS

• Autor(a) principal: Moreira, César Augusto [UNESP]
• Data de Publicação: 2013
• Outros Autores: Cavalheiro, Mara Lia Dias, Pereira, Alice Marques [UNESP], Sardinha, Diego de Sousa
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.14295/ras.v27i3.27415; http://hdl.handle.net/11449/135238
• topic: Geophysical; Free Aquifer; Statistical; DC Resistivity; Induced Polarization; Caçapava do Sul; Geofísica; Aquífero livre; Estatística; Eletrorresistividade; Polarização induzida; Caçapava do Sul - RS

The geophysical methods may be employed in aquifer system studies, as determination of groundwater level, soil/rock contact, beyond estimative of the aquifer thickness horizon. The geoeletric methods are particularly relevant in evaluations of the oilfields systems, due to directs relations between porosity and electrical resistivity, which allow inferences about oil and gas production. The indirect estimative of the productions in free aquifers system is something complex before of the diverse variables responsible for factors or physical phenomena, as clays minerals, which conditioned the physical parameters by electric geophysical methods. This paper present analyzed correlation among electrical resistivity, chargeability and direct measure flow in shallow wells, for determination of statistical relationships between parameters and evaluation of the geological constraints evolved. The study count with the 23 shallow wells located in free aquifer, constituted by alteration materials of the granites localized in Caçapava do Sul (RS). The geophysical data are acquired by vertical electric sounding in Schlumberger array. The correlations between electrical resistivity and flow, chargeability and flow, thickness of the soil/saprolite and flow indicated relationships between physical and hydrogeologic parameters, with variations conditioned by factors as porosity, permeability, besides intrinsic geological heterogeneities such soil variable thickness and rock fragments with several alteration degrees.