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ABSTRACT
In order to conduct a thorough foraminiferal biostratigraphic analysis of the OKM Well, a total of fifty seven (57) ditch cutting samples were made available by Shell Petroleum Development Company of Nigeria for sedimentological analysis between the interval of 6,140ft and 9,500ft. The sedimentological analysis, along with sample description, yielded lithologies that are sandy shale and shaly sand; the minerals observed includes carbonate minerals quartz, clay minerals and feldspars. The sediments were treated in the laboratory to concentrate the foraminifera and encourage their microscopic observation. Based on the occurrences of the biostratigraphic markers: florilus costiferum (Nonion 4), ammobaculites, uvigerina subperegrina and eggerella scabra, the sediments collected from the OKM Well in the Coastal swamp depobhelt, Niger Delta Basin are Middle Miocene to Late Miocene in age. The well's foraminifera zonation was determined by looking at the first and final downhole occurrences of species that are important to chronology. The zones designated for the sediments is F9600. The Coastal deltaic to Inner Neritic depositional environments are shallow. This research work was done based on just the foraminiferal contents of the OKM Well. For further studies, the use of palynomorphs should be carried out as well as the organic geochemical studies should be done to have an understanding of the hydrocarbon potential of the well
