Date of Award

Spring 2020

Document Type

Open Access Dissertation

First Advisor

James Kellogg

Abstract

Geological structures and petroleum systems associated with La Florida anticline and the Cusiana fault system in the Llanos foothills and the Guavio anticline and the Guaicaramo fault system in the Medina basin were interpreted based on 3D seismic data from La Florida anticline in the foothills, 2D seismic data in the Medina basin and Guavio anticline, well, and surface geology maps. Unlike previous interpretations of the Guavio anticline and Medina basin area, our interpretation shows that thin-skinned thrusting on the Guaicaramo fault preceded thick-skinned basement thrusting. Late Miocene thin-skinned ramp thrusting was followed by a Pliocene thick-skinned fault-bend fold ramping up from pre-Cretaceous basement to a double-wedge fault. To the east, all the thrusting on the Cusiana fault and La Florida anticline was thin-skinned. At La Florida we propose a previously unrecognized late Miocene-Pliocene fault-bend fold, followed by the Cusiana reverse fault, a forelimb breakthrough fault ramping up from two bedding plane detachments. New 1-D burial models predict that the La Florida anticline has an active petroleum system (source, reservoir, seal, timing of charge, and trap formation) similar to the nearby giant Cusiana field, and source rocks remain in the oil window. In the Llanos foothills high levels of deformation have produced considerable noise in the seismic data and, therefore, seismic attribute analysis has not been used. In this study, techniques to reduce noise and enhance seismic quality make possible the first multi-attribute analysis of a 3D seismic volume in the Foothills using Geological structures and petroleum systems associated with La Florida anticline and the Cusiana fault system in the Llanos foothills and the Guavio anticline and the Guaicaramo fault system in the Medina basin were interpreted based on 3D seismic data from La Florida anticline in the foothills, 2D seismic data in the Medina basin and Guavio anticline, well, and surface geology maps. Unlike previous interpretations of the Guavio anticline and Medina basin area, our interpretation shows that thin-skinned thrusting on the Guaicaramo fault preceded thick-skinned basement thrusting. Late Miocene thin-skinned ramp thrusting was followed by a Pliocene thick-skinned fault-bend fold ramping up from pre-Cretaceous basement to a double-wedge fault. To the east, all the thrusting on the Cusiana fault and La Florida anticline was thin-skinned. At La Florida we propose a previously unrecognized late Miocene-Pliocene fault-bend fold, followed by the Cusiana reverse fault, a forelimb breakthrough fault ramping up from two bedding plane detachments. New 1-D burial models predict that the La Florida anticline has an active petroleum system (source, reservoir, seal, timing of charge, and trap formation) similar to the nearby giant Cusiana field, and source rocks remain in the oil window. In the Llanos foothills high levels of deformation have produced considerable noise in the seismic data and, therefore, seismic attribute analysis has not been used. In this study, techniques to reduce noise and enhance seismic quality make possible the first multi-attribute analysis of a 3D seismic volume in the Foothills using.

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