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Petrophysical properties of bypassed Cenozoic clastic reservoirs in the Cesar sub-basin, Colombia
Determinación de propiedades petrofísicas a través del análisis de registros de pozo para conocer las primeras ideas en la evaluación de reservorios clásticos cenozoicos en la subcuenca Cesar, Colombia
DOI:
https://doi.org/10.15446/esrj.v25n3.89293Keywords:
Cesar sub-basin, well log analysis, reservoir rock, petrophysical properties. (en)análisis de registros de pozo, roca reservorio, propiedades petrofísicas., subcuenca Cesar (es)
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The Cesar-Ranchería basin has all the necessary elements for the generation, expulsion, and migration of hydrocarbons and considerable potential for coal bed methane (CBM) in Colombia. Previous studies in the Cesar basin focused on understanding the tectonic evolution, stratigraphy, hydrocarbon generation potential, and evaluation of reservoir potential in Cretaceous calcareous units and quartzose sandstones from the Paleocene Barco Formation. These studies had confirmed the existence of an effective petroleum system, with several episodes of oil expulsion and re-emigration in the Miocene period, turning the Cenozoic clastic succession (Barco, Los Cuervos, La Loma, and Cuesta formations) into an element of significant exploratory interest to clarify the potentiality of the basin in terms of hydrocarbon accumulation. The petrophysical parameters of Cenozoic units (shale volume, porosity, water, and oil saturation) were determined by integrating wells log and core samples analyses from three stratigraphic wells. The integration of these results synthesizes the petrophysical behavior of the units. It defines intervals with clay volumes of less than 30%, effective porosity around 20%, which means favorable characteristics as reservoir rocks that need to be considered in future exploratory projects.
La Cuenca Cesar Ranchería contiene todos los elementos necesarios para la generación, expulsión y migración de hidrocarburos y el potencial de gas asociado a carbón (CBM) en Colombia. Aunque algunos investigadores se han centrado en el entendimiento de la evolución tectónica de la cuenca, estratigrafía y potencial de generación de hidrocarburos, los trabajos en busca de la caracterización de rocas reservorio solo se han llevado a cabo en formaciones Cretácicas, consideradas el principal objetivo reservorio, sin hallazgos importantes. Investigaciones recientes que confirman la existencia de un sistema petrolífero efectivo, episodios de expulsión y remigración de hidrocarburos en el Mioceno, convierten la sección clástica Cenozoica en un elemento de significante interés exploratorio para aclarar el potencial de acumulación de la cuenca. El presente estudió se realizó en la sección superior de la sucesión Barco-Cuervos, las formaciones la Loma y Cuesta, en la parte sur de la subcuenca Cesar, una área prospectiva para la industria de los hidrocarburos, la cual tiene la presencia de estructuras que preservan el mayor espesor de unidades Cenozoicas. A través del análisis de registros de pozo y la integración con información de núcleos se determinaron los parámetros petrofísicos (volumen de arcilla, porosidad, saturación de agua y aceite), se generó un modelo de litotipos y se identificaron unidades hidráulicas de flujo. La integración de estos resultados sintetiza el comportamiento petrofísico de las unidades y propone intervalos con características favorables como roca reservorio para las formaciones clásticas Cenozoicas presentes en los pozos de estudio, lo que proporciona nuevos datos que deben ser considerados en futuros proyectos exploratorios y contribuye al conocimiento geológico de la subcuenca Cesar.
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