HIDRODINÁMICA E HIDROGEOQUÍMICA DEL PIEDEMONTE LLANERO COLOMBIANO: HIPÓTESIS DE RUTAS DE MIGRACIÓN A PARTIR DE TÉCNICAS HIDROGEOLÓGICAS
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Universidad Industrial de Santander
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La nueva información de presión de formación, fisicoquímica e isotopía ambiental, permitieron la elaboración de hipótesis preeliminares sobre el origen y movimiento del agua de formación asociada a hidrocarburos en Piedemonte y parte central de los Llanos Orientales. En Piedemonte, se sugiere la presencia de sistemas hidráulicos individuales sobrepresionados, asociados a cada estilo estructural; encontrándose un sistema levemente subpresionado al sur de Cupiagua. El origen de las aguas de formación es confuso, encontrándose aguas connatas con bajas salinidades, aguas empobrecidas isotópicamente con altas salinidades y aguas con desviaciones en las trayectorias isotópicas, sugiriendo la acción de procesos de mezcla y/o interacción roca-fluido. Se determinó flujo SW, con una anomalía de flujo W-SW (Cusiana), favorecida por canales permeables originados por la yuxtaposición de litologías permeables.
En Llanos, se sugieren sistemas hidráulicos levemente sobrepresionados (menos que en Piedemonte), con zonas de subpresión para campos paralelos y adyacentes al frente de deformación. La isotopía sugiere la acción de procesos de mezcla y/o interacción roca fluido. Anomalías de presión y fisicoquímica, sugieren mezcla de fluidos en forma ascendente, con plumas dispuestas paralelamente y adyacentemente al frente de deformación. El flujo es N-NW desde el SE, hacia zonas subpresionadas al centro de la cuenca.
Palabras Claves: Hidrodinámica, Hidrogeoquímica, Migración, Piedemonte, Llanos Orientales
New information of formation pressure, groundwater physicochemical and environmental isotopes, allowed to carry out hypothesis on the origin and movement of formation water associated to hydrocarbons in Foothill and central part of the Llanos Orientales basin. In Piedemonte, overpressured individual hydraulic systems are suggested, associated to each structural style; founding a slightly subpressured system to the south of Cupiagua. The formation water origin in not clear, founding cognate waters with low salinities, waters with isotopic impoverishment and high salinities, and waters with deviations in the isotopic trajectories, that suggest action of mixture processes and/or interaction rock-fluid. It has been established a SW flow, with a W-SW anomaly (Cusiana), which is favoured by permeable channels originated by juxtaposition of permeable lythologies. In Llanos, slightly overpressured hydraulic systems are suggested (less than in Piedemonte), with subpressured zones for field parallel and adjacent to the deformation front. Isotopic analysis suggests the action of mixture processes and/or interaction fluid-rock. Pressure and physicochemical anomalies, suggest mixture of fluid in ascending form, with plumes parallel and adjacent to the deformation front. The flow is N-NW from SE, towards subpressured zones in the basin. Key words: Hydrodynamic, Hidrogeochemical, Migration, Piedemonte, Llanos Orientales
New information of formation pressure, groundwater physicochemical and environmental isotopes, allowed to carry out hypothesis on the origin and movement of formation water associated to hydrocarbons in Foothill and central part of the Llanos Orientales basin. In Piedemonte, overpressured individual hydraulic systems are suggested, associated to each structural style; founding a slightly subpressured system to the south of Cupiagua. The formation water origin in not clear, founding cognate waters with low salinities, waters with isotopic impoverishment and high salinities, and waters with deviations in the isotopic trajectories, that suggest action of mixture processes and/or interaction rock-fluid. It has been established a SW flow, with a W-SW anomaly (Cusiana), which is favoured by permeable channels originated by juxtaposition of permeable lythologies. In Llanos, slightly overpressured hydraulic systems are suggested (less than in Piedemonte), with subpressured zones for field parallel and adjacent to the deformation front. Isotopic analysis suggests the action of mixture processes and/or interaction fluid-rock. Pressure and physicochemical anomalies, suggest mixture of fluid in ascending form, with plumes parallel and adjacent to the deformation front. The flow is N-NW from SE, towards subpressured zones in the basin. Key words: Hydrodynamic, Hidrogeochemical, Migration, Piedemonte, Llanos Orientales