Geoelectrical characterization of the neogene-quaternary units in the middle sector of the Claromecó basin
Keywords:
Geological model, electrical resistivity, vertical electrical sounding, Claromecó basinAbstract
The Vertical Electrical Sounding (VES) method, through unidirectional readings of the electrical resistivity of the subsurface, allows the identification of lithological units, the depth of the water table and the depth of the bedrock, including other applications. The objective of this study was to identify and characterize the geometry and morphology of the subsurface geological formations of the Neogene and Quaternary ages in the middle section of the Claromecó creek basin in Buenos Aires province. The VES method was employed by applying the Schlumberger tetra-electrodic symmetric array with a spread length of 800 and 1600 m. The field curves were interpreted using Zohdy software to obtain the true resistivities of the layers. Using IPI2Win a better fit of the resistivity model was achieved and then was parameterized with 70 m deep wells located in the study area. Longitudinal and transverse transects of the creek were carried out to integrate the information. Finally, three-dimensional maps of each recognized layer were designed. Based on this analysis, eight layers with different resistivities were identified from the base to the top. The 3D model shows a gradual decrease in the top of the layers towards the SW, whereas the transects show variation in the thickness of the layers. It was possible to develop a geological model of the subsurface in the area of Primer Brazo de los Tres Arroyos creek, correlated with the local and regional lithostratigraphic schemes. The geometry and morphology of the subsurface Neogene-Quaternary units of the middle basin of the Claromecó creek were recognized.
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Copyright (c) 2025 Greta Rios Hiriart, María Soledad Gualde, Magali Fornés, Camila Aile Gregorini, Sebastian Kuntz, Pablo Weinzettel
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