Foraminifera Biostratigraphy and Depositional Environment of Sediments in SILE Well, Offshore Dahomey Basin

Akinsile Oladimeji, Olabisi Adeleye Adekeye, Solomon Adeola Adeyinka, Olusegun Ayobami Olatinpo, Oluyemi Emmanuel Faseki

Abstract


The sedimentary succession penetrated by the SILE Well offshore Benin republic in the Dahomey basin has been investigated for biostratigraphy and paleoenvironment of deposition. This section consists from the base to the top of sandstone overlying by shale measuring a total thickness of approximately 2000m. Twenty samples of shale were selected and processed for Foraminiferal study. The result of micropaleontological analysis reveals moderately rich and diverse microfauna of planktic and benthic foraminifera totalling 78 species altogether. 64 species (82.6%) are calcareous and 14 species (17.9%) are arenaceous. Of the calcareous forms, benthics accounted for 45 species (70.3%) while planktics accounted for 19 species (29.7%). Two major Planktic biostratigraphic zones were identified: The Morozovella subbotinnae zone, Morozovella vellascoensis and an Undiagnostic zone suggesting a Late Maastrichtian to Early Eocene interval. Based on the recovered benthic foraminifera, Haplophragmoides sp., Bulimina marginata, Eponides pseudoelevatus, Karreriella bradyi, Hopkinsina hourqi, Cibicidoides pseudoungerianus, Gyroidinoides girardanus, Lenticulina grandis, Oridorsalis umbonatus, Karreriella bradyi and Bathysiphon sp.suggests a depositional environment ranging between outer neritic and upper bathyal. Integration of biostratigraphy and depositional environment suggests that the sediment were deposited within Late Maastritchtian to Early Eocene interval with 3 major biostratigraphic zones in generally shallow marine environment ranging from outer shelf to upper bathyal with water depth not deeper than 300m.

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