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ABSTRACT
This project work has determined the extent of shale content according to various depth levels and their corresponding effect on porosity, formation water saturation from five wells obtained in the Brown field situated in the coastal swamp, western onshore region of the Niger -Delta (Brown field). The work evaluated the depth reservoir sands and correlated wells using relevant well reservoir parameters of interest to confirm trends conformable to Niger - Delta basin oil and gas reservoirs. Shale has influence on porosity and water saturation. The porosity of different units of reservoir sands showed variation laterally with porosity values decreasing down with reservoir depth. On the whole, permeability was found to decrease down the depth, though sand L has high value than sands J and K lying several feet above it. It is established that porosity and permeability of sandstones depends on grain size, sorting, cementation and compaction. The reservoir sands J, K and L deposited in a low energy marginal deltaic and shelf margin/slope have slightly reduced porosity and permeability due to high volume of clays (shales) and silts (siltstones) often associated with environments. The porosities of the reservoir sands are good to very good; their permeability moderate to good. Oil and gas accumulation is high and widespread throughout the Brown field. The hydrocarbon resources can be exploited at profit.
