keywords: Potential reservoirs; Sedimentological; Heterolithic; Depositional; Core analysis; Ichnofossils
Cores of MAJUEFE-1 well were analysed within the context of geological core analysis to minimise the risk of interpretation based on the use of inferred data only. Lithofacies intervals were identified, characterized and sedimentologically described. Depositional environments were also reconstructed and delineated. Sandstones, siltstones, heterolithics and mudstones were the lithofacies present. The primary sedimentary structures are beddings, ripples laminations and mud drapes. Much of the sediment is sparsely to intensely burrowed by biogenic activity. Twelve facies were characterized based on gamma –ray response to lithologic variationsin grain size, composition, texture, glauconite content, sedimentary structures and bioturbation as observed on the cores displayed. The main depositional environments represented in the cored interval comprise of marine, tidal channel, tidal flat, tidal inlet and coastal (littoral) shoreface environments. Sandstones in the shoreface and tidal point bar are excellent and good potential reservoirs for hydrocarbon respectively, but very poor in the strongly bioturbated reservoir sands of the trangressive sand Interplay of these encountered environments suggestive that deposition occurred in a marginal marine setting influenced by tidal conditions.