Cuenca Del Valle Superior Del Magdalena, Colombia. Sistema Petrolero La Luna

The Upper Magdalena Basin is an intermountain basin located in the southern part of Colombia, between the Central and Eastern ranges. It has 26,200 km2 of extension and discovered reserves up to of 881 x 106 bo and 123 x 10~ cfg. The Villeta Group and<br>specifically the La Luna Formation (Turonian - Coniacian) is considered here the main source rock. This unit was deposited during the development of the passive margin stage of the basin, when transgressives events of global character were combined with excellent conditions of biological productivity, anoxia, intermediate rates of sedimentation and fine grain sediment predominance. The basin presents isolated zones of generation related to the axial zone of the synclines, where the subsidence was more continuous and, according to basin modeling, the hydrocarbon expulsion processes occurred during Late Oligocene to Miocene (last 30 Ma), reaching La Luna Formation very high rates of transformation. The main trap types are associated to three different tectonic events and correspond to: anticline folds associated to thrust faults, truncated anticlines, thin skin thrusting and stacking in triangular zones. The most important reservoirs are Caballos and Monserrate formations, with average porosities around 18%.