Three-dimensional geological subsurface models are a numerical representation of geological features of interest in a particular area. The three-dimensional representation is obtained by means of meshed surfaces of geological structures as fault/fractures surfaces, bedding planes, stratigraphic horizons and contacts of any kind. Therefore the 3D geological models in this sense constitute the sum of all geological investigation, from morpho-stratigraphic to structural, summarizing the available knowledge into an integrated meshed model.