Hydrocarbon Reservoir Mapping and 3d Seismic Interpretation of “Deejay†Field, Onshore Niger Delta

The 3-D seismic data interpretation and reservoir mapping of ‘‘Deejay field’’ have been carried out with the use of Schlumberger (PETRELTM) software. This research work is aimed at delineating the subsurface structure and deducing the trapping system of the study area that may aid hydrocarbon accumulation. The research methodology involved horizon and fault interpretation to produce subsurface structural maps. Available Wireline log signatures were employed to identify hydrocarbon bearing sands and compute reservoir petrophysical parameters for hydrocarbon pore volume determination. Two faults F_01 and F_02 (synthetic) were mapped using seismic structural attribute (variance) with fault polygon generated on the surface. Structural interpretation for inline 5533 revealed two horizons (1&2) were taken into consideration with their time and depth maps generated for the purpose of this study. The structural maps revealed fault assisted closures at the centre of the field which correspond to the crest of rollover anticlines and possibly served as the trapping medium. Three hydrocarbon bearing reservoirs – S1, S2 and S3 were delineated from three wells and the top and base of each reservoir window were mapped from the wells. Reservoirs S1, S2 and S3 have average porosity values of 30.7%, 29.8% and 29.3% respectively. All the porosity values obtained are in agreement with the established porosity values of Agbada formation of Niger Delta as it ranges from 28-32%. The obtained permeability index for the three reservoirs are rated very good. Hydrocarbon saturation values for the three wells have an average of 72.3% for S1, 83.7% for S2 and 76.7% for S3. The Petrophysical parameters from the wells show that most of the reservoirs are good targets in hydrocarbon prospecting. The result shows that the three reservoirs in the field have high hydrocarbon potential and good trapping mechanism for its productivity.