Abstract
Foraminifera biostratigraphy and paleoenvironmental analysis of the sediments penetrated by Sahaiawei-1 Well in the Northern Delta Depobelt, Niger Delta Basin was carried out in order to determine the foraminifera biozonation, age, paleobathymetry, depositional environment and paleo-oxygen condition of the well. The total foraminifera population recovered was two thousand, three hundred and sixty five (2365), with planktic foraminifera constituting one hundred and fifty four (154) forms, while calcareous benthic and agglutinated benthic foraminifera recovered accounted for two thousand, one hundred and sixty two (2162) and fourty nine (49) of the total foraminifera population respectively. The total foraminifera species recovered was fifty nine (59); planktic accounted for twenty (20) foraminifera species, while calcareous and agglutinated benthic foraminifera accounted for thirty one (31) and eight (8) foraminifera species respectively. Five benthic foramineferabiozones were identified: lumped P7-P13, P5-P6/P7, lumped P3-P4, lumped P1-P2 and M18 Zones of Blow (1969, 1979). The result of the analysis indicates that the entire analysed interval (1800ft – 10680ft) was deposited during the Late Maastrichtian to Late Eocene epoch. The depositional environments of the Well varied from littoral, marginal, shallow and deep marine environments.
 Keywords: Biozonation, Calcareous, Arenaceous, Agglutinated, Hyposaline Marshes, Hyposaline Shelf Sea
Highlights
The Niger Delta is the largest basin in southern Nigeria
The Basin which has an age range of Cretaceous to Recent is located in the Southern part of Nigeria (Short and Stauble, 1967).The Niger Delta stratigraphic sequence comprises of an upwardcoarsening regressive association of Tertiary clastic deposits up to 12km thick ( Evamy et al, 1978)
Five (5) benthic foramineferabiozones were identified: lumped P7-P13, P5-P6/P7, lumped P3-P4, lumped P1P2 and M18 Zones which correspond to late Maastrichtian and late Eocene age were identified.The Late Maastrichtian sediment signifies Cretaceous age
Summary
The Niger Delta is the largest basin in southern Nigeria It is situated at the zone where the rifting and separation of Africa and South America was initiated. The basin was formed by failed arm of a triple junction (aulacogen) after rifting ceased in the Mid-Cretaceous (Short and Stauble, 1967). The Basin which has an age range of Cretaceous to Recent is located in the Southern part of Nigeria (Short and Stauble, 1967).The Niger Delta stratigraphic sequence comprises of an upwardcoarsening regressive association of Tertiary clastic deposits up to 12km thick ( Evamy et al, 1978). The sedimentary basin is sub-divided into three stratigraphic units. These are from the oldest to the youngest, the Marine Akata, Paralic Agbada and Continental Benin
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