Abstract
This paper summarizes the tectonosedimentary development and petroleum system of the Offshore Benin Basin (OBB). In accordance with structural development, the stratigraphic succession of this basin was divided into 4 sequences: pre-rift (up to Late Jurassic); rift (Neocomian to Lower Cretaceous); transitional (Cenomanian to Santonian) and post-rift (Maastrichtian-Holocene) sequences. Only one Upper Cretaceous petroleum system is well known within this basin. Source rocks of this system contain Type II-III kerogens with a TOC (Total Organic Carbon) average of 2.9%. Oil is produced from sandstone facies within Abeokuta formation. Currently exploration data and geochemical characteristics of bituminous sands which outcrop in some onshore areas of the Dahomey Embayment point to the existence of another petroleum system of Lower Cretaceous age (Neocomian to Albian) in this basin.
Highlights
According to the significant increased interest and exploration activity in the northern Gulf of Guinea, this paper aims to define the geology and the petroleum systems of the Offshore Benin Basin (OBB)
The tectonostratigraphy development and the history of the formation of the total Petroleum Systems of the Offshore Benin Basin are summarized in events charts (Fig. 11, 12)
Rocks within the petroleum system are from Lower Cretaceous to Paleocene in age
Summary
With an area of some 40 000 km, the Offshore Benin Basin (OBB) belongs to the Benin Coastal Basin, one of the coastal basins of the “Dahomey Embayment” (Fig. 1). The maximum extent of this system coincides with the boundaries of the Embayment and the minimum extent of the system is defined by the area extent of fields of the eastern Dahomey Embayment (Benin and western Nigeria). Most of this petroleum is in fields on the continental shelf or in waters less than 2 000 meters deep. According to the significant increased interest and exploration activity in the northern Gulf of Guinea, this paper aims to define the geology and the petroleum systems of the Offshore Benin Basin (OBB). The results of this study can be useful for companies in target to infer the hydrocarbon potential of the basin and make an assessment of the basin resources
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