Late Miocene- Pleistocene Foraminiferal Biostratigraphy of Well Eb-1 and Eb-2 Offshore Depobelt, Western Niger Delta Nigeria

This study entails a quantitative planktic and benthic foraminifera biostratigraphy of wells EB-1 and EB-2(OPL 227) in the offshore depobelt of the Western Niger Delta Ngeria. A total of One hundred and fifty two (152) ditch cutting samples from depth 1,100 to 2,620m at 10m interval of Eb-1 well and eighty eighty (88) ditch cuttings from depth 1280 to 2160m intervals of Eb-2 well were analyzed. Recovered foraminifera assemblage is fairly rich, diverse and well preserved with both planktic and benthic foraminifera well represented in the two wells. The study revealed the interval to have penetrated early Pliocene to Pleistocene ages and late Miocene to Middle Pliocene ages respectively. The recovered index forms among the foraminifera assemblage were used in used in dating and zoning of the interval. The Early Pliocene to Pleistocene correspond to N18 –N22 zone which were characterized by Globigerinoides rubber, Globorotalia pseudopima, Neogloboquadrina Dutertrei, Globoquadrina altispira Globigerinoides conglobatus,, Bolivina Scalprata miocenica among other forms while the Late Miocene – Middle Pliocene ages corresponds to N18-N20 zone, and are characterized by Haplophragmoides Sp., Globigerinoides sp., Globoquadrina altispira. Haplophragmoides compressa, Cyclammina cf.minima, Globorotalia exilis, Globoquadrina dehiscens.