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Structural Evolution of La Florida Anticline and Petroleum System in a Foreland Fold Belt, Eastern Cordillera Foothills, Colombia


Structural evolution of La Florida anticline and petroleum system in a foreland fold belt, Eastern Cordillera Foothills, Colombia

Ziyad Albesher, Ibraheem Hafiz, James Kellogg, Essam Saeid

The La Florida anticline is located in the Llanos Foothills, a prolific sub-Andean petroleum province on the southeastern flank of the Eastern Cordillera of Colombia. The giant Cusiana and Cupiagua fields are located along structural strike in hanging-wall anticlinal traps to the northeast of the La Florida anticline. The traps were formed during the Late Oligocene-Early Miocene “thin-skinned” and Miocene-Holocene “thick-skinned” deformation of the Eastern Cordillera. The source rocks are Gachetá Formation Late Cretaceous organic-rich black marine mudstones. Reservoir rocks include upper Eocene Mirador Formation sandstones and Paleocene Barco Formation estuarine sands. Cap rocks are Oligocene Carbonera marine shales C8. Well ties and horizon mapping were based on a rich seismic data volume (322 km2 3D high-resolution seismic and 540 2D seismic profiles, Pacific Energy/Frontera) and 7 wells. Volume-balanced forward and retrodeformed structural modeling, and 1D basin models suggest that migration pathways were available for the La Florida anticline at the time of maximum oil expulsion (6 – 8 Ma). Structural traps are Andean age (3 – 6 Ma) fault-bend folds with transpressive displacement. Fracture attribute analysis (Ant-tracking, Chaos and Variance) indicates possible up-plunge sealing fault (4-way closure) for anticlinal trap permitting accumulation of hydrocarbons. The La Florida anticline has an active petroleum system (source, reservoir, seal, timing of charge, and trap formation) similar to the adjacent Cusiana giant field. The Medina anticline to the southwest of La Florida is isolated from the active Foothills source pods by a major sealing thrust fault. Hydrocarbon accumulations in the Medina structure are therefore limited or non-existent.