Geometric modeling of hydrofacies applied to the northern sector of Bucaramanga, Santander, Colombia

Abstract

In the northern sector of the city of Bucaramanga, Colombia, the geological units present a complex lithostratigraphic configuration, with textural variations that involve a wide granulometric range and percentage of variable matrix, being of interest its hydrostratigraphic characterization, not locally developed. In order to understand the water-soil system, a hydrostratigraphic geometric model was elaborated through the relationship of lithofacies and hydrofacies and correlation of geological sections, through the online tool Geomodelr. With collected cartographic data and the use of drill cores at a depth of 100 to 150 m, four hydrofacies were distinguished and classified with their respective distribution and lateral continuity, following a 3D extension methodology. The model was calibrated with piezometric and geoelectric information, evaluating the geological characteristics that define the actual underground flow, with a general preferential distribution of gravelly segments of hydrogeological interest, sandy and clayey segments that, added to the structural framework, exhibit the hydrostratigraphic characteristics of the area. The generation of a three-dimensional model of this kind allows, in addition to visualizing the distribution of the units, the determination of the complex hydrogeological system that makes up the sector, with stratigraphic information supplemented with geophysical and piezometric data.