Browsing by Author "Osisanya, O. W."

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    Geogenic and Anthropogenic Sources of Groundwater Contamination in Osubi Community and its environs, Warri, Delta State, Nigeria.
    (Journal of Applied Sciences and Environmental Management, 2025-10) Osisanya, O. W.; Onifade, Y. S.; Olaseni, V.B.; Korode, A. I.; Sharafa, J. O.
    Groundwater contamination poses a significant challenge to water quality, especially in regions with limited access to clean water. Consequently, the objective of this paper is to investigate the Geogenic and Anthropogenic Sources of Groundwater Contamination in Osubi Community and its environs, Warri, Delta State, Nigeria using the Wenner-Schlumberger array and vertical electrical sounding (VES). The results revealed resistivity values ranging from 5.5 Ωm to 121,387.6 Ωm, with several zones showing very low resistivity indicative of contamination. Notably, contamination was observed primarily in hallow surface layers, with certain areas such as Samuel Ariko Street and Airport Hotel Street exhibiting significant resistivity anomalies. These low resistivity zones suggest the presence of pollutants, though the specific geogenic or natural origin remains unclear, as no typical anthropogenic sources, such as waste disposal sites or industrial discharge were identified. The findings imply that groundwater contamination in Osubi may result from natural geochemical processes, possibly related to the local geology or subsurface conditions, rather than from human activity. This study underscores the need for a deeper understanding of regional groundwater systems and the application of geophysical techniques in identifying contamination sources in areas where traditional water quality assessments may fall short. Recommendations for further research and mitigation strategies are discussed to address the growing concerns of water safety in the region.
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    Petrophysical Evaluation and Seismic Interpretation of Geowil Hydrocarbon Bearing Reservoir in the Niger Delta Region of Nigeria.
    (JASEM, 2023-09-30) Osisanya, O. W.; Ogugu, A. A.; Saleh, A. S.; Eyankware, O. M.; Oyanameh, E. O.
    The objective of this research was to carry out a petrophysical evaluation and seismic interpretation of Geowil hydrocarbon-bearing field in the Niger Delta Region of Nigeria using standard techniques. Three hydrocarbon-bearing sands were identified, namely reservoirs R-1000, R-2000 and R-3000, from the well log data. The result showed that both reservoir R-1000 and R-2000 reveal high resistivity values and low water saturation while reservoir R-3000 indicates that the hydrocarbon contained is oil and gas. Both reservoir R-1000 and R-2000 are observed to be thinning out across the field, reservoir R-3000 is seen to be slightly undulating across the field. The petrophysical computation obtained for the three reservoirs (R-1000, R-2000 and R-3000) revealed that they all have very good average porosity anomalies of 27%, 27% and 25% respectively as well as moderate permeability values (159.974Md, 126.9Md, and 162.02 Md respectively) rating. The hydrocarbon saturation index obtained for all the three reservoir (55%, 54% and 50%) showed that they are all good indicator of prolific hydrocarbon accumulation. The result of the volume of hydrocarbon originally in place and the volume that can be recovered estimated revealed that R-1000 has STOIIP of 262.47MMSTB, R-2000 has 2.66MMSTB and R-3000 has 42.67MMSTB. The ultimate recovery for the three reservoirs is 19.31MMSTB, 1.19MMSTB, and 19.2MMSTB respectively. This implies that the reservoir has great potential for oil resources in considerable size.