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PORTILLA, ADOLFO, Exploraiton Management, Corpoven S.A., Puerto la Cruz, Venezuela

ABSTRACT: Tectonic Events and Structural Configuration of the Barinas to Apure Basin

Among the Sub-Andean basins of northern South America is located the Barinas-Apure basin, in southwestern Venezuela.

Through the analysis of high-resolution seismic-profiles and surface geology, three different tectonic events have affected the sediments of this basin : a) a late Cretaceous-Paleocene event, related with the Laramidian orogenesis, b) a late Middle Eocene event, related to north-Venezuelan flexure, and c) a Miocene to Pleistocene event, under the influence of the Andean (Merida) orogenesis. Is the last one, the responsible of the present-day structural configuration on the basin, i. e., an assymetric syncline. Several complex structures and fault-systems are recognized in this basin, they are grouped in pre-Oligocene and Miocene-Pleistocene in origin. Among these, only the pre-Oligocene structures have accumulated important oil reservoirs.

AAPG Search and Discovery Article #90988©1993 AAPG/SVG International Congress and Exhibition, Caracas, Venezuela, March 14-17, 1993.