Browsing by Author "Osisanya, O.W."

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    Depiction of Aquifer Potential and Vulnerability Mapping: A Case Study of Delta North, Southern Part of Nigeria, Using Geophysical Approach.
    (Discovery Nature, 2025) Eyankware, M.O.; Osisanya, O.W.; Akakuru, O.C.; Odesa, G.E.; Okanigbuan, P.N.; Ukor, K.P.; Oghenevovwero, E.E.; Chukwusa, F.O.
    In order to identify the aquifers, characterize their geometric properties, and determine their susceptibility to contamination by surface contaminants, a detailed hydrogeophysical investigation of the aquifers of the study area was conducted. The study area was subjected to fifteen (15) vertical electrical soundings (VES) with a Schlumberger array configuration with a maximum electrode separation of 200 m. Curve matching methods and iterative computer modeling were combined to process the VES data. Parameters estimated are aquifer thickness, longitudinal conductance (S), transverse unit resistance (Tr), average longitudinal resistance (ρL), aquifer conductivity (ῼ−1), hydraulic conductivity (K), and transmissivity (T), and their corresponding estimated values, which vary across the study area, range from 1.63 to 103.83 m, 0.02 to 0.05, 0 to 122169.9 ohms, 0 to 3406.4, 0.000037 to 0.001126, 0.0538 to1.13x1023m2/day, 0 to 1.85x1023m2/day, respectively. Deductions from S. revealed that the study area is prone to contamination from the study. Further findings from groundwater modeling, hydraulic conductivity, and transmissivity suggested that the southwestern part of the study area showed more groundwater prospects when compared to other parts of the study area. Within the study, it was observed that curve Q is the most dominant curve within the study area.
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    Structural Seismic Interpretation of Olaj - field within the Niger Delta.
    (IOSR Journal of Applied Geology and Geophysics (IOSR-JAGG), 2021) Osisanya, O.W.; Korode, A.I.; Ighrakpata, F.C.; Asarhasa, P.E.; Nwigwe, G.C.
    Structural seismic interpretation is a key component of seismic interpretation workflow, as much information on reservoir architecture which is required for hydrocarbon play assessment can be obtained. This study presents the results of the integration of structural time-depth maps to define reservoir units across five (5) well for hydrocarbon play assessment of Olaj-field within the Niger Delta basin. Two reservoir windows (R1 and R2) were delineated from five wells (W-02, 04, 06, 07 and 012). The top and base of each reservoir window were delineated from the five wells using their gamma ray and resistivity log response. Well to seismic correlation was carried out with checkshot data from well-012. Structural interpretation for inline 6975 revealed about eight (8) faults labelled (F1, F2, F16, F8, F10, F18, F17 and F6) were mapped. It was observed that about five (5) faults (F1, F10, F18, F17 and F6) were identified as synthetic faults and dip basinwards towards the southern while about three (3) antithetic faults (F2, F16 and F8) were observed which dips landwards in the western direction. These are characteristics of growth faulting within the Niger Delta basin. Structural interpretation revealed a highly faulted reservoir system which depicts the tectonic setting of the Niger Delta.