Reservoir Quality Lokoja Basange Formation Anambra Basin Sieve Analysis Sedimentology Porosity Permeability Grain Size Distribution Sandstone Reservoirs Textural Characteristics Textural Parameters

This study was conducted to investigate the reservoir quality of outcropping sediments in the Lokoja Basange Formation, which is located in the Anambra Basin and specifically determine sieve analysis and characterize the reservoir qualities of the sediments by inferring the porosity of the Lokoja Basange Formation. A total of fourteen (10) samples were collected and analyzed for the study. Freshly obtained samples for sieve analysis were systematically retrieved from different layers on each outcrop in the study area. The reservoir porosity and permeability of the sandstone units of the Lokoja Formations were estimated from sieve analysis. The predictive tools for the determination of reservoir quality of the outcropping sediments in Lokoja Basange which are porosity and textural characteristics and textural parameters of the sediments. The result showed that the mean size of sediments in all ten locations from the area of study ranges from 2.94 - 4.03mm. The highest mean was observed at L9, while the lowest mean was observed in L14. The results from Table 4.11 also showed that at locations L9, L10, L11, L12, and L13, the sediments exhibit coarse characteristics, as indicated by their relatively higher grain sizes, which exceed 2mm. The result showed that the porosity values across all locations are consistent (0.255), indicating that regardless of the variations in grain size distribution, the overall volume of void space within the sediment remains the same. It is recommended that further studies be carried out on this basin so as to determine the provenance of the sediments.