Abstract
An attempt is made in this paper to present the dynamics of the Eastern Niger Rift Basin (ENRB) with references to the key features and processes of petroleum systems based on published information. The Eastern Niger Basin is a superimposed rift basin with sedimentary structures emplaced during two rifts episodes. The Cretaceous episode is characterized by large, tilted normally faulted blocks trending NW-SE, that were reactivated in the Paleogene, while the Paleogene episode is characterized by normal faulted blocks that trend NNW-SSE. The rifting resulted in different basin structures with the north section dominated by asymmetric half-grabens while the south section is dominated by full-grabens. Three source rocks each belonging to three different play fairways exist: 1) The Paleogene Sokor-1 Member source belongs to second cycle syn-rift play associated with fluvial/deltaic facies; 2) Cretaceous Yogou and Donga sources from first cycle post-rift play associated with alluvial/fluvial/deltaic and marine clastic and carbonate facies; and 3) Cretaceous Yogou source from first cycle transitional play associated with mudstone and shale of transitional facies. The ENRB comprises two source-reservoir-seal assemblages: a lower assemblage of Upper Cretaceous and an Upper assemblage of the Paleogene. Except for the Yogou source which possesses a self-contained petroleum system, the rest of the source rocks release their oils into the Paleogene Sokor-1 Member reservoir sealed regionally by the Oligocene Sokor-2 Member. The Paleogene assemblage is charged from the Upper Cretaceous Yogou Formation through fractures emplaced during the rifting episodes.
Highlights
The Republic of Niger is a Sub-Saharan landlocked nation in West Africa
Three source rocks each belonging to three different play fairways exist: 1) The Paleogene Sokor-1 Member source belongs to second cycle syn-rift play associated with fluvial/deltaic facies; 2) Cretaceous Yogou and Donga sources from first cycle post-rift play associated with alluvial/fluvial/deltaic and marine clastic and carbonate facies; and 3) Cretaceous Yogou source from first cycle transitional play associated with mudstone and shale of transitional facies
This paper presents a review and update of the basin and petroleum potential of the Eastern Niger Rift Basin (ENRB) based on published works, previous reviews and information from the Niger Petroleum Ministry
Summary
The Republic of Niger is a Sub-Saharan landlocked nation in West Africa It is confined by seven countries; on the west by Burkina Faso and Mali, on the east by Chad, on the north by Algeria and Libya and on the south by Benin and Nigeria (Figure 1). It has an area of 1,267,000 square km and a population of about 21.4 million people. The Eastern Basin runs 700 km west-east and 1000 km north-south, extending into the Borno Basin, NE Nigeria [2] [3]. This paper presents a review and update of the basin and petroleum potential of the ENRB based on published works, previous reviews and information from the Niger Petroleum Ministry
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