FORAMINIFERA BIOFACIES AND PALEOENVIRONMENTAL INTERPRETATION OF THE IRAH WELL, NIGER DELTA BASIN
Abstract
ABSTRACT
This study examines the IRAH-1 Well in the Niger Delta Basin to interpret foraminiferal biofacies and reconstruct past depositional settings. Ditch-cutting samples recovered between 2,200 and 4,900 ft were analyzed, yielding both planktonic and benthic foraminifera that allowed the identification of key biozones and correlation with established Niger Delta and global frameworks. The fossil assemblages point to a Middle to Late Miocene age and suggest alternating shallow to deeper marine environments influenced by sea-level shifts and deltaic input. Variations in shale color and organic matter types further reflect changes in oxygen conditions and sediment supply. The presence of well-preserved and thermally mature foraminifera indicates favorable conditions for hydrocarbon generation. Overall, the findings refine the biostratigraphy of the Niger Delta, improve understanding of its paleoenvironmental evolution, and provide insights that are valuable for petroleum exploration.
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