Depositional Environment and Facies Controls of Odirin Well, Eastern Niger Delta

The lithofacies stacking pattern of the study area shows a cycle of fining-upward-coarsening upward and fining upward sequences which indicates a transgressive-regressive sequence and also a fluctuating environment in terms of energy processes. The mean grain size 2.280 (fine sand) shows sedimentation of a moderate energy environment. The sedimentary structures is indicative of a moderate or fluctuating energy of an environment of deposition. The occurrence of burrows or trace fossils of Paleophycus, Diplocratarion, Ophiomopha indicate sedimentation in a tidal influenced environment. The overprint of the primary structures may be as a result of a better oxygenation with lower deposition rates. The Gamma log shape of dominant cylindrical or serrated shape indicates sedimentation in a sand-shale intercalated and moderate energy environment probably a braided fluvial channel or distributary channel fill. Therefore, from the structures above, the depositional environment is inferred to be a shallow marine environment or a distributary channel fill.