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" Structural Evolution of La Florida and Guavio Anticlines, Fractures, and Petroleum Systems in a Foreland Fold Belt, Eastern Cordillera Foothills, Colombia "
Albesher, Ziyad
Kellogg, James
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Latin Dissertation
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English
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| Record Number
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1053976
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TL53093
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| Main Entry
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Albesher, Ziyad
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| Title & Author
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Structural Evolution of La Florida and Guavio Anticlines, Fractures, and Petroleum Systems in a Foreland Fold Belt, Eastern Cordillera Foothills, Colombia\ Albesher, ZiyadKellogg, James
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| College
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University of South Carolina
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| Date
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2020
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| Degree
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Ph.D.
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2020
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| Note
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111 p.
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| Abstract
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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 coherency and ant-tracking techniques for fault and fracture detection. The results could help model reservoir fracture porosity and permeability. Late Miocene NE-SW normal faulting and fractures may have been produced by lithospheric bending as the mountain front advanced. We compared fracture intensity and orientation in folded rocks with non-folded rocks. Our study showed NE-SW, NW-SE, and E-W fracture orientations in the non-folded seismic volume, suggesting that regional stresses could produce these fracture sets, not just folding as previously proposed. Active right-lateral strike-slip displacement on the nearby Algeciras fault system may have generated Riedel-type shear fractures in the Foothills study area.
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| Descriptor
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Geology
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Geophysics
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Latin American studies
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Kellogg, James
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University of South Carolina
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