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The Toldado Field discovered in 1987, is in the Upper Magdalena Valley, Girardot Subbasin, Tolima department. Its production comes mainly from the sandstones present in the "Caballos" Formation, deposited in a shallow marine environment, whose age has been reported as Aptian-Albian (CORRIGAN, 1967).Although this field has a long history of exploitation, it has presented periods with high production declines and its recovery factor is considered extremely low. The results of the analysis of tracers used in the field, the operational problems related to the loss of mud and the presence of fractures in the drilling cores show that the Caballos Formation in the Toldado Field presents some zones affected by fracturing. However, there are many uncertainties about the distribution and size of these zones that are affecting the fluid dynamics in the reservoir. This work confronts the peculiarities of the reservoir rock and considers its sedimentology, its diagenesis, and its subsequent fracturing, to understand the factors that govern the behavior of the fluids present in the reservoir. Consequently, a new description of the cores acquired in the field was made and the samples taken from these cores were reviewed and analyzed. The description of lithofacies, the environmental interpretation of the Caballos Formation, its sedimentological and diagenetic characteristics, and its mineralogy were elaborated. The rock types and their textural characteristics were defined, and the different fractures present in the cores were identified and described.All available information was integrated and interpreted to generate a conventional static model of the field, which included structural and petrophysical modeling and geostatistical distribution of the matrix properties of the rock types. Finally, an algorithm is proposed that allows the generation of a static fractured model of the field, implicitly incorporating the fracturing associated with purely geological factors such as the type of rock, the distance to fault zones and the folding present in the rocks, with the consequent affectation of the permeability in the fractured zones.

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