ABSTRACT
The Niger Delta Basin is the most prolific sedimentary Basin in Nigeria till date. Petroleum in the Niger Delta is produced from sandstone and unconsolidated sands predominantly in the Agbada Formation. It is pertinent to delineate these hydrocarbon reservoirs to uncover precious hydrocarbon resources. This research aims to characterize specific reservoirs in Prime Field, Niger Delta in terms of lithology, fluid content and contacts, porosity, permeability and water/hydrocarbon saturation.
A total of four well log suites comprising of Sonic, Neutron, Gamma Ray, Density logs were analyzed. Reservoir zones were qualitatively identified using the log signatures to eliminate the shale packages. Seven reservoirs showing progradational and aggradational patterns were investigated. Correlations established between desired rock properties and measured physical properties were used to derive rock properties such as porosity, water saturation, permeability, net-to-gross, etc.
The results of this study showed that reservoir thickness (pay zone), volume of shale, effective porosity, permeability and hydrocarbon saturation had a combined average of 96ft, 29.89%, 20.26%, 483.6mD and 75.10% respectively. The reservoirs have porosity values ranging from 10.79 to 24.09%, permeability values between 65.16 to 1430.71mD and water saturation values that range from 11.74 to 38.85%. In conclusion, the study reveals that Prime field is a prolific hydrocarbon zone with the quality of the reservoirs in the field ranging from moderate to good.
