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Evaluation of hydrocarbon saturation was carried out in ―X‖ field, Niger Delta, using seismic and well log data. This was done to determine the amount of hydrocarbon in place in the ―X‖ field. Results from seismic data is one of the many tools used by the petroleum industry to access the quantity of oil and gas available for production from a given field or to access the potential of an undeveloped resource. However, the interpretations from the seismic data were integrated with results from well log analysis for proper evaluation of the hydrocarbon saturation of the oilfield. Two hydrocarbon bearing reservoirs each from the four wells were correlated to establish the continuity of reservoir sands. The estimated average thickness of the two reservoirs is 15.15m and 53.06m for reservoir A and reservoir B respectively. The average porosity for reservoir A is 0.231 and 0.215 for reservoir B. The quality of the porosity is very good. The computed average water saturation is 0.359 and 0.349 for reservoir A and B respectively. This shows that the hydrocarbon saturation is 0.641 and 0.651 for reservoir A and reservoir B respectively. Horizons and faults interpretation were carried out to produce subsurface structure maps from the seismic data. This was done to study the field’s subsurface structures serving as traps to hydrocarbon and estimate the prospect area of the reservoirs. Results gotten show that the hydrocarbon in place for both reservoirs is 450MMSTB indicating that the field under consideration has good hydrocarbon prospect.