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ABSTRACT
A Sedimentological analysis was carried out to determine the Paleodepositional environment and evaluate the Aquifer characteristics of the sand facies within the Imo formation in the study area. Thirty (30) ditch cutting samples from the Imo Formation were collected from Obaretin Well, Okada in Edo State, and three (3) samples were selected for particle size analysis. The samples were subjected to acid test, to identify the presence of carbonate minerals in the samples and give a clue into the depositional environment. From the various analyses carried out it was discovered that particle varies among the samples with respect to depth, degree of roundness. Also the Paleo depositional environment of the sediment were influenced by both sea water and fresh water. The litho-facies analysis indicates a spectrum of marine environments ranging from upper offshore, lower to upper shore face to the foreshore. From these assemblage, the result shows the sand facies of the Imo Shale Formation were deposited as a submarine delta front. Using sedimentological methods and techniques the result from this research shows that the Imo formation was deposited in a proximal transitional environment and the depositional environment was influenced by both fluvial and wave processes which happened simultaneously in other to shape a transitional environment. The relationship of this “fluid’ environment with the available materials (Sand, shale and mud) lead to the formation of aquifers within the Imo shales. The sandy unit reflect transgression and the influence of both storms and waves that result in the composition of the sediment to be mixed silicic-clastic-carbonate. The high degree of effervescence suggest the presence of carbonate either as cementing material, hence the Aquifers in the Imo Formation have reduced productive potentials.
