The aim of this study is to integrate well logs and core data to identify reservoir characteristics and determine the reservoir's petrophysical properties in order to improve the understanding of the reservoir and provide valuable information for reservoir management. Wells X and Y of the ‘SCOJAS’ Field in the Niger Delta Basin of Nigeria were analyzed using Gamma ray logs, Resistivity logs, Sonic, Neutron and Density Logs. The obtained results were compared with core data from the wells to verify their accuracy. Porosity values for Wells X and Y fall within the range typically observed in sedimentary rocks, with Well Y having higher values. Hydrocarbons were detected in all reservoirs except reservoir zone 1b in both Well-X (12 reservoirs) and Well-Y (7 reservoirs). In Well- X, oil was identified in 5 reservoir zones while in Well-Y, oil was present in 2 reservoir zones. The remaining zones in both wells contained gas. To validate the results further, a comparison was made with the porosity of selected fields in the Niger Delta Basin and the general porosity of the Basin. Well X has a porosity range of 2.7% to 20.8%, which is generally lower than the reported porosity range Well Y has a porosity range of 19.90% to 24.38%, which falls at the upper end of the reported porosity range. Comparing previous works and data from other fields provides important validation for the findings of the study, which is crucial in the oil and gas industry for making informed decisions about exploration and production.
A reservoir characterization study was conducted on three wells located in X Field, situated in the Onshore region of the Niger Delta. A suite of conventional digital well logs was utilized to identify hydrocarbon-bearing reservoirs, determine reservoir petrophysical parameters, and infer the depositional environment. The study delineated four hydrocarbon-bearing reservoirs, labeled A, B, C, and D, with porosity estimates ranging from 25% to 27%, and permeability values varying from 1863.22md to 2759.78md. These results suggest that the reservoirs have good storage capacity and permit free flow of fluids, consistent with prior research in the Niger Delta. The water saturation values, ranging from 43% to 70% for Well X and 53% to 94% for Well Y, indicate the presence of significant hydrocarbon in reservoir C, while Well Z did not contain any hydrocarbon. The estimation of oil and gas resources indicated that Well X contains 1.11 X 105 barrels/acre of oil and 5.16 X 107 cubic feet/acre of gas, while Well Y contains 4.43 X 106 cubic feet of gas. The analysis of the volume of shale (0.15-0.19) revealed that the reservoirs range from slightly shaly sand to shaly sand. Based on the log motifs, the study suggests that the reservoirs are mainly fluvial channel deposits, and the rapid alternation of thin beds of sand and shale indicates deposits of delta progradation and river floodplain deposits.
The sediment of the Rivers Ero and Adogo in Geregu, Ajaokuta, was studied to determine any variances or similarities in petrographic and sedimentological properties. The sediment samples had particle size parameters estimated, with mean values ranging from 0.45 to 0.94 (River Ero) and 0.15 to 0.67 (River Adogo), indicating that the sediment samples are all coarse grained. The sediment samples' standard deviations vary from 0.9 to 1.2 (River Ero) and 0.92 to 1.57 (River Adogo), indicating moderate to poor sorting. The sediment samples' estimated skewness ranges from -0.09 to -0.12 (River Ero) and -0.01 to -0.16 (River Adogo), showing coarse to strongly coarse skewed sediments that were deposited in a high energy environment. The sediment samples have computed kurtosis ranging from 0.63 to 1.01 (River Ero) and 0.65 to 1.06 (River Adogo), indicating platykurtic to Mesokurtic. The sediment samples from the Rivers Ero and Adogo all fall within the river sand field of Sahu 1964, according to bivariate statistics of skewness vs standard deviation. The depositional environment of the sediment samples was characterised using a linear discriminant function, which revealed that the sediment of River Ero is predominantly beach, shallow agitated marine, and shallow marine, whereas the sediment of River Adogo is entirely beach, shallow agitated marine, and shallow marine. The sediment samples are composed of >94 percent quartz and are most likely sourced from the cratonic interior, according to petrographic data.
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