Aplicaciones de la tomografía eléctrica con diferentes configuraciones para la correlación geológica de la Formación San Cayetano del sector Noreste de la ciudad de Loja

Abstract

Abstract: This research applies direct and indirect methods to correlate the lithological sequence using a geoelectrical profile surveyed on the edge of the slope located northeast of the city of Loja. The geophysical data were measured using Electrical Resistivity Tomography (ERT) using Dipole-Dipole, XL Gradient, and Schlumberger configurations, obtaining profiles with resistivity values ​​that allowed correlation with the different lithological layers of the profile. The results obtained from the geological survey identified layers of clays, sandstones, and calcareous shales that are part of the San Cayetano Formation. The 2D resistivity models obtained using dipole-dipole and XL gradient methods better define the thicknesses of the lithological layers and a significant change in their continuity, which would be interrupted by a fault step. However, the resistivities obtained using the Schlumberger configuration provide little discrimination for the model, but the change due to the presence of the geological fault can be observed. The relationship between lithology and resistivity values ​​of subsurface layers allows for improved interpretations in geological investigations.