Fractured reservoirs in the Eastern Foothills, Colombia, and their relationship with fold kinematics
Tamara, Javier Mora, Andrés Robles, Wilmer Kammer, Andreas Ortiz, Alberto Sanchez-Villar, Nelson Piraquive, Alejandro Rueda, Luz Helena Casallas, Wilson Castellanos, Jaime Montaña, Jorge Parra, Luis Guillermo Corredor, Jaime Ramirez, Ángela Zambrano, Enus
Fractured reservoirs in the Eastern Foothills, Colombia, and their relationship with fold kinematics - ago. 2015 - 34 p. ; 1599-1633
Transcripción del resumen del autor: Analysis of fracture systems in subsurface structures is limited by the amount and uncertainty of available data. With the aim of analyzing the distribution of fracture systems, we studied surface structures as analogs for oil fields in the Previous HitfracturedNext Hit Previous HitreservoirsNext Hit of the Llanos Previous HitfoothillsNext Hit of Previous HitColombiaNext Hit. Here, we document the presence of four widespread fracture systems whose distribution is related to Previous HitfoldNext Hit geometry and folding mechanism. At surface, in the Tierranegra and Silbadero anticlines, the principal fracture systems are symmetrical with respect to northeast- and northwest-trending Previous HitfoldNext Hit axes, showing higher fracture intensities in the forelimbs of the structures. In the Guavio anticline, higher fracture intensities are located in the backlimb, with principal east–west and northwest–southeast directions. In contrast, we document northeast–southwest fractures near the hinge zones in the adjacent synclines. This distribution suggests that in the Guavio anticline, fractures respond to movement of the hanging-wall above a ramp, consistent with a fault-bend-Previous HitfoldNext Hit model. Whereas, in the Tierranegra and Silbadero anticlines, fractures respond to limb rotation and hinge migration consistent with detachment Previous HitfoldNext Hit models. Comparing these with subsurface structures, we identified that El Morro anticline has fracture distributions like those in the Tierranegra and Silbadero anticlines, but have higher fracture intensities. In the case of the Cusiana Structure, fracture intensities are higher in the crest but not in the limbs, and intensities differ from the ones found in the Guavio anticline, showing that these structures are not appropriate analogs. The results show how fracture distribution depends on structural position and Previous HitfoldNext Hit evolution, and is controlled in part by folding mechanism. This suggests that models based on Holocene Previous HitfoldNext Hit geometry cannot accurately predict the observed fracture distributions and should not be used to construct discrete fracture network models. Instead, the patterns we describe can be used as a guide for similar structures. Our work illustrates the possibility of having different fracture patterns and fracture abundances in adjacent folds in the same Previous HitfoldTop-thrust belt.
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Fractured reservoirs in the Eastern Foothills, Colombia, and their relationship with fold kinematics - ago. 2015 - 34 p. ; 1599-1633
Transcripción del resumen del autor: Analysis of fracture systems in subsurface structures is limited by the amount and uncertainty of available data. With the aim of analyzing the distribution of fracture systems, we studied surface structures as analogs for oil fields in the Previous HitfracturedNext Hit Previous HitreservoirsNext Hit of the Llanos Previous HitfoothillsNext Hit of Previous HitColombiaNext Hit. Here, we document the presence of four widespread fracture systems whose distribution is related to Previous HitfoldNext Hit geometry and folding mechanism. At surface, in the Tierranegra and Silbadero anticlines, the principal fracture systems are symmetrical with respect to northeast- and northwest-trending Previous HitfoldNext Hit axes, showing higher fracture intensities in the forelimbs of the structures. In the Guavio anticline, higher fracture intensities are located in the backlimb, with principal east–west and northwest–southeast directions. In contrast, we document northeast–southwest fractures near the hinge zones in the adjacent synclines. This distribution suggests that in the Guavio anticline, fractures respond to movement of the hanging-wall above a ramp, consistent with a fault-bend-Previous HitfoldNext Hit model. Whereas, in the Tierranegra and Silbadero anticlines, fractures respond to limb rotation and hinge migration consistent with detachment Previous HitfoldNext Hit models. Comparing these with subsurface structures, we identified that El Morro anticline has fracture distributions like those in the Tierranegra and Silbadero anticlines, but have higher fracture intensities. In the case of the Cusiana Structure, fracture intensities are higher in the crest but not in the limbs, and intensities differ from the ones found in the Guavio anticline, showing that these structures are not appropriate analogs. The results show how fracture distribution depends on structural position and Previous HitfoldNext Hit evolution, and is controlled in part by folding mechanism. This suggests that models based on Holocene Previous HitfoldNext Hit geometry cannot accurately predict the observed fracture distributions and should not be used to construct discrete fracture network models. Instead, the patterns we describe can be used as a guide for similar structures. Our work illustrates the possibility of having different fracture patterns and fracture abundances in adjacent folds in the same Previous HitfoldTop-thrust belt.
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