Geología (trabajo de grado)
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Examinando Geología (trabajo de grado) por Materia "Aburrá Valley"
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Ítem Caracterización geoeléctrica del acuífero libre del suroccidente del Valle de Aburrá, a partir de tomografías eléctricas calibradas con un modelo geológico inicial y de física de rocas(Universidad EAFIT, 2020) Ospina Benítez, David; Vanegas Cubillos, Sebastián; Jaramillo Uribe, Marcela; Restrepo Correa, Isabel CristinaThe initial geological (IGM) and rock physics (RPM) models are important tools in the processes of geophysical inversion (electrical resistivity tomography) and their interpretation, when they are used in order to achieve the stratigraphic and hydrogeological characterization of a zone of study. The IGMI and RPM are built from the processing of primary and / or secondary information, generating a schematic representation of the area which contributes to the understanding of the physical properties of the materials. These initial models must be implemented for the interpretation of data in shallow geophysics. In the case of electrical tomography, the interpretations depend largely on the quality of the field data, the processing and the amount of geological information available. The implementation of IGM and RPM is a fundamental tool to reduce the uncertainty related to the problem of non-uniqueness in geoelectric investments. For the construction of the IGM of the study area, the available geological cartography and stratigraphic columns were considered, this information allowed to perform stratigraphic correlations and geological profiles. While for the RPM, the information used was apparent resistivities of materials in the study area and their granulometric characteristics. Geological sections, stratigraphic correlations, and expected resistivity ranges in the materials in the study area are the most important parameters in the interpretation of electrical tomography. This study analyzes the case of the unconfined aquifer of Valle De Aburrá defined by AMVA and UdeA (2012), AMVA and UdeA (2013) of the southwestern zone, where it is mainly composed of unconsolidated deposits. Through geophysical interpretation it was found that the materials that composed these deposits in the study area have textural variations and, therefore, their classification and their hydrogeological behavior are heterogeneous.