Modelo geológico 3D del acuífero de Medina del Campo (SE Cuenca del Duero)

Abstract

A 3D geological model of the Cenozoic detrital aquifer of the Medina del Campo groundwater body is presented, a region at the SE part of the Duero Basin with an extension of around 3,700 km2 . The geological model was performed using the Geomodeller software based on previous and new acquired data: mapping, boreholes, vertical electric soundings, time– domain electromagnetic soundings and gravimetric data. The 3D gravimetric inversion allowed constricting the initial 3D geological model in areas with low data density. Modelled geological units include the variscan basement, the Cretaceous, the Paleogene and the Miocene. The 3D model shows a basin structured in highs and depressions with E-W and ENE-WSW trends associated with the interaction between reverse and subvertical faults that develop depocenters of variable depth. In the Medina del Campo sector, the basement reaches 1000 m depth; meanwhile, in the southern sector of Arévalo, the basin reaches 2000 m thickness. The average thickness of the Cretaceous, Paleogene and Miocene units is around 150 m, 500 m and 1000 m, respectively. This model represents an important advance in the knowledge of the aquifer geometry and of this sector of the Duero basin.