RESERVOIR CHARACTERIZATION IN ALERO FIELD, NIGER DELTA, NIGERIA

This study attempts to access the quality, spatial variation and economic viability of A and C reservoirs across eight wells in the Alero Field. Suites of wireline well log data for the wells of the Alero Field were evaluated to characterize the reservoirs. From the quantitative and qualitative analyses carried out, it was revealed that reservoir A has the following petrophysical characteristics across the wells; Gross thickness 14.85m to 193.01m, shale volume 16% to 28%; total porosity: 31%to34%; effective porosity: 25% to 29%; permeability: 9962.25mD to 12912.90mD;
water saturation: 7% to 24%, while for reservoir C across the wells; shale volume10% to 36%%; total porosity: 28% to 33%; effective porosity: 21%to 29%; permeability: 10174.20mD to 12498.70mD; water saturation: 5%to 59%. The results show both reservoirs to exhibit favourable properties across the wells, including moderate to high net-to-gross (NTG) ratios, effective porosity, high hydrocarbon saturation, and good permeability. However, variations in shale content (VSh), water saturation, as well as pay zone thickness across the wells suggest
spatial heterogeneity in reservoir quality. Overall, reservoir A is found to be a more promising candidate for oil production, showing better permeability (10174.20mD to 12498.70mD) and overall hydrocarbon saturation (75% to 93%).