Detailed stratigraphic study of La Paila formation in the La Uribe-Sevilla section, hydrocarbon potential reservoir in the Cauca-Patía basin
Abstract
The importance of this detailed analysis of the La Paila formation in La Uribe - Sevilla (Valle) section, sponsored by the ANH, arises from the contribution of stratigraphic data on the cenozoic rocks that compose this formation, which correspond mainly to coarse clastic levels, tuffs, green lodolitas and plants remains; this formation is in the vicinity of the Nogales formation, a hydrocarbon generating unit, the reason why La Paila formation could constitute a potential reservoir. The facial analysis of this section indicates that the sedimentation is alluvial. It reveals massive clast-supported conglomerates (debris flows), clast-supported conglomerates with imbrications, trough-cross-bedded and planar-cross-bedded conglomerates (gravel bars). The parallel-flat-laminated sands, the massive lodolitas and the clast- supported conglomerates with imbrications are produced by non-canalized flows when floods and correspond to deposits of alluvial fan and braided streams. During the sedimentation volcanic activity will take place, something from which evidence is found in the tuff levels. In previous geologic studies the La Paila formation the has been correlated with different litologic units of the Valle del Cauca due to the scarse stratigraphic data, which has generated confusions in the up-to-date geologic maps. In the west part of the section rocks with different characteristics from the superficial rocks on the east part were found and they are separated by an important fault, suggesting two different litologic units.
Keywords
La Paila formation, cenozoic, alluvial fan, braided currents
References
- Acosta, C., 1970: El graben interandino colomboecuatoriano. I Congreso Latinoamericano de Geología, Lima.
- Arroyave, C.P. y Ramos K., 2009: Caracterización geológica y análisis granulométrico de depósitos volcaniclásticos en la formación La Paila (secciones, La Paila - Sevilla, La Uribe - Sevilla, Andalucia - Galicia y Buga - La Habana), Tesis de Geología Universidad de Caldas, Colombia.
- Aránzazu, J. M., y Ríos, P. A., 1989: Análisis litofacial del intervalo oligoceno- mioceno en el sector noreste de la subcuenca del Valle del Cauca, departamento del Valle, Tesis de Geología. Universidad de Caldas, Colombia.
- Brook, M., 1984: New age radiometric data from SW Colombia. Ingeominas - Misión Británica, 10: pp 1-25.
- Flórez, A., 2003: Evolución de sus relieves y modelados. Universidad Nacional de Colombia. Unibiblios, p. 38.
- Folk, R. L., 1968: Petrology of sedimentary rocks. Austin, Texas, Hemphill.
- González, H., 1980: Geología de las planchas 167 (Sonsón) y 187 (Salamina). Boletín Geológico, Ingeominas. 23(1): pp. 1-174.
- Grosse, E., 1926: El terciario carbonífero de Antioquia. Dietrich Reimer (Ernst Vohsen), Berlín, p. 361.
- Keith, J. F. J., Rine, J. M. y Sacks, P. E., 1988: Planchas 223/242 (El Cairo-Zarzal). Geology Map, Frontier basins of Colombia. Valle del Cauca field report. Earth Sciences and Resources Institute. University of South Carolina., pp. ESRI Technical report 88-0012.
- Miall, a., 1996: The geology of fluvial deposits. sedimentary facies, basin analysis and petroleum geology. Springer-Verlag. Italia. p. 482.
- Mc Court, W.J., 1984: The geology of the central cordillera in the departments of Cauca’s Valey, Quindío and NW Tolima. Ingeominas. Misión Británica. p. 300.
- Nelson, H. W., 1957: Contribution to the geology of the central and western cordillera of Colombia in the section between Ibagué and Cali. Leidse Geologische Mededlingen 22, pp. 1-76.
- Nivia, A., 2001: Geología del departamento del Valle del Cauca. Cali, Ingeominas.
- Schwinn, W. L., 1969: Guidebook to the geology of the Cali area, Valle del Cauca, Colombia, Bogotá, Colombian Society of Petroleum Geological and Geophysicists, 29.
- Van Der Hammen, T., 1958: Estratigrafía del terciario. maestrichtiano continentales y tectogénesis de los Andes colombianos geológico. Servicio geológico nacional, Bogotá, D.C., Colombia, Boletín Geológico Vol. 6, p. 150.