A geophysical survey has been developed in one zone located in the Southeastern of the Peninsula. The purpose is determining the geological characteristics of the subsoil and to define different aspects: tilt and thickness of the layers, thickness of the sedimentary basin, tectonic features, etc. The study of the sedimentary basin has been carried out to several scales, from general scales to more detailed scales, and finally it was verified with the geophysical logging of two wells. All of these data have allowed to determine a very coherent relation between the geophysical and geological data and, in addition, determining a more complex geological structure for this research area.