Abstract

The Gulf of Venezuela is one of the remaining possible oil provinces of Venezuela. Adjacent to the prolific Maracaibo Basin, it has had a structural history of dominant epeirogenesis resulting in the formation of a western, relatively stable, block and eastern, subsiding, area. The extrapolation of sedimentary conditions prevailing in surrounding areas suggests that while considerable deposits of Sediments have been preserved in the eastern half, these have been partially reduced by erosion in the western block.

The combination of structural and sedimentary processes believed to have taken place in the Gulf suggests that reasonably good chances for commercial oil accumulations exist in the area. Although there seems to have been a time gap between the main periods of oil generation, Cretaceous to Eocene, and the time of formation of the main structural features, Miocene to Pliocene, primary oil migration could have reached points of incipient structural growth from where secondary migration could have taken place in later geological periods.

Résumé

Le Golfe de Vénézuela constitue une des nouvelles provinces pétrolières possibles du Vénézuela. Adjacent du prolifique Bassin de Maracaibo, il a eu une histoire structurale dominée par une épirogénèse qui a eu pour effet la formation à l'Ouest d'un bloc relativement stable et à l'Est d'une zone de subsidence. L'extrapolation des conditions sédimentaires existantes dans les régions prôches permet de dire que la quantité de sédiments préservée est considérable dans la partie Est alors qu'elle a été réduite par érosion dans la partie Ouest.

La combination des phénomènes structuraux et sédimentaires que l'on pense avoir existé dans le Golfe permet de croire qu'il y a dans cette région de bonnes chances d'accumulations commerciales. Vraisemblablement, une lacune de temps a eu lieu entre la principale période de formation du pétrole-Crétacé à Eocène-et celle de la formation des structures les plus importantes-Miocène à Pliocène-mais la migration primaire a pu atteindre des zones en voie de développement structural d'où une migration secondaire a pu avoir lieu dans des temps géologiques ultérieurs.

Introduction

The Gulf of Venezuela (Fig. 1) lies in the northwestern part of the country and has an area of about 15,000 sq. km. It has not, as yet, been explored by the drill. Water depths range from 15 m to 60 m, although in the major part the water is 20-40 m deep.

Geophysical prospecting of the Gulf has included gravimeter, magnetometer and seismic reflection work.

The most active years of exploration were 1953 to 1958.

However, new seismic surveys were conducted in 1964- 1965 with digital equipment.

The surrounding land areas have been well studied during the last forty years. In the Falcón Basin, besides numerous geological field surveys, more than two hundred wells have been dr

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