Petrophysical Characterization and Flow Models for Agbada Reservoirs, Onshore Niger Delta, Nigeria | Science Publications

American Journal of Geoscience

Prince Suka Momta¹  Charles Ugwu Ugwueze¹  John Owate Etu-Efeotor¹ 

关键词: Shoreface Sand;    Shallow Marine;    Porosity;    Permeability;    Lorenzo Plot;   

DOI  :  10.3844/ajgsp.2015.40.52

来源: Science Publications

【 摘 要 】

Three selected reservoirs (XB, XC and XE) from three wells(A, B and C) occurring within the Agbada producing sands in part of the GreaterUghelli Depobelt of the onshore Niger Delta have been studied. The study aimsat evaluating the petrophysical characteristics of the sand-bodies and also identifiesthe various flow units present within each reservoir. Petrophysical parameterswere used as input data to generate the Stratigraphic Modified Lorenzo Plots(SMLP). This model uses a graphical method to quantitatively determine flowunits and to understand the flow and storage capacities of sedimentary rocks.Results of the analysis shows that average porosity and permeability range isbetween 7-28.8% and 1.20-529 mD, indicating poor to very good reservoir qualityin different parts of the field. Generally, porosity and permeability decreasewith increasing depth in the field reflecting burial diagenetic porosity lossin response to increasing thermal exposure with depth. Porosity andpermeability change laterally across the field from west to east. Increase inporosity and permeability towards the easternpart of the field reflects lateral change in facies. Well C has the bestporosity (28%) and permeability (529 mD), lowest water saturation (0.01),hence, highest hydrocarbon prospect. The stratigraphic Modified Lorenzo Plots(SMLP) revealed a total of seventy five (75) Flow Units (FU) in the threestudied reservoirs. Each reservoir displays similar flow pattern relative toothers suggesting that facies (rock properties) have a strong control on flow ineach reservoir. Generally, poor quality units occur towards the bottom of eachreservoir in a well and good quality units towards the top. The dominant flowunits in the three reservoirs fall within the high storage and flow (normalflow unit) unit category, suggesting that the dominant depositional setting(shallow marine shoreface/beach/barrier) and facies type beside diageneticeffects play significant role in fluid dynamic behaviour of any rock body.Depositional environments and subsequent diagenesis are the primary factorscontrolling porosity distribution, pore connectivity and fluid flow in thethree studied reservoirs.

【 授权许可】

Unknown