Mijares, José F.¹, Maria Silva¹, Wilfredo Maestracci¹, Euries Gil¹ 
(1) PDVSA, Puerto La Cruz, Venezuela

ABSTRACT: Tectonic Evolution and Hydrocarbon Migration Synchronization in the Tacata Area

The study area is located to the northeast of the Anaco town of the Anzoategui State, eastern Venezuela. Analysis of seismic lines from an interpreted seismic volume, using stratigraphic data and geometric seismic patterns reveals the tectonic evolution in the study area. The results indicate the succession of four different basins. First a Jurassic extensional basin. Second a Cretaceous passive margin basin. Third a transitional basin that started with the deposition of the Oligocene, and proceeded with the Miocene sediments both of them showing a growing influence of the advancing Caribbean Tectonic Plate, and Fourth a Middle to Late Miocene foreland basin with its thrusts faults and décollements. The faults, thrust faults, traps, and hydrocarbon present in the study area were developed during the last 10 million years. The team was capable to order the succession of the tectonic events. Then using these results and the data provided by the wells around the area, they fed the Basinmod software in order to model the burial of the sediments, as well as the generation and expulsion of the hydrocarbons. The results indicated that there are 5 different tectonics blocks, each one with two source rocks that started generating hydrocarbon at different times. The results also show that the petroleum system worked perfectly for four of these blocks.

AAPG Search and Discovery Article #90026©2004 AAPG Annual Meeting, Dallas, Texas, April 18-21, 2004.