Petrophysical Evaluation and Seismic Interpretation of Geowil Hydrocarbon Bearing Reservoir in the Niger Delta Region of Nigeria

Abstract

The objective of this research was to carry out a petrophysical evaluation and seismic interpretation of Geowil hydrocarbon bearing field in the Niger Delta Region of Nigeria using standard techniques. Three hydrocarbon bearing sands were identified namely reservoir R-1000, R-2000 and R-3000 from the well log data. The result showed that both reservoir R-1000 and R-2000 reveal high resistivity values and low water saturation while reservoir R-3000 indicates that the hydrocarbon contained is oil and gas. Both reservoir R-1000 and R-2000 are observed to be thinning out across the field, reservoir R-3000 is seen to be slightly undulating across the field.  The petrophysical computation obtained for the three reservoirs (R-1000, R-2000 and R-3000) revealed that they all have very good average porosity anomalies of 27%, 27% and 25% respectively as well as moderate permeability values (159.974Md, 126.9Md, and 162.02 Md respectively) rating. The hydrocarbon saturation index obtained for all the three reservoir (55%, 54% and 50%) showed that they are all good indicator of prolific hydrocarbon accumulation. The result of the volume of hydrocarbon originally in place and the volume that can be recovered estimated revealed that R-1000 has STOIIP of 262.47MMSTB, R-2000 has 2.66MMSTB and R-3000 has 42.67MMSTB. The ultimate recovery for the three reservoirs is 19.31MMSTB, 1.19MMSTB, and 19.2MMSTB respectively. This implies that the reservoir has great potential for oil resources in considerable size.