Browsing by Author "Ibitoye, A.T."

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    Assessment of Subsurface Competency Using Geotechnical Method of a Proposed Structure F.C.T Nigeria
    (Bilingual Publishing Co., 2022-12-30) Osisanya, O.W.; Diyanuwa, A.B.; Korode, A.I.; Ibitoye, A.T.; Ajibade, F.Z.
    Structural failure has been recently happenings mostly in the commercially populated states along the coastal line in Nigeria. As a result, an open field at a chosen location in Abuja, Nigeria, was investigated. For the purpose of this study, test bores were drilled and Standard Penetration Tests (SPT) were conducted at every 1.5 m interval up to a maximum depth of 12.0 m with the bearing pressure ranging between 20 kN/m2 and 1000 kN/m2. 3 test bores were drilled within the plot location, and samples were obtained at the test bore’s locations for laboratory analysis. Findings revealed that subsurface lithology found at the site within the explored depths of 0.0 12.0 m is mostly silty sand, laterite, sandy clay, silty clay, clayey sand, and weathered rock. The findings from the sub-soils of the different places and their bearing pressures were computed with SPT N value. Building foundations may be rigid raft foundations at a depth of 2.0 meters below the present ground level, according to bearing capacity values that range from 20 kN/m2 to 60 kN/m2 at 1.5 to 3.0 meters. The recommended building foundations take into account the sub-soil’s characteristics at the drilling places at a depth of between 1.0 and 3.0 meters. The structure might also be supported by frictional piles buried 10 meters beneath the surface.
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    Delineation of Laterite Deposits using Two-Dimensional Geo Electric Imaging in Agbonmwoba Village Area of Obaretin Town, Edo State, Nigeria.
    (Sabinet / African Journals, 2017) Osisanya, O.W.; Ibitoye, A.T.; Eze, S.; Ezomo, F.O.; Okeh, O.
    The study involves delineation of laterite deposits in Agbonmwoba village area of Obaretin town, Edo state using 2D resistivity tomography technique to predict the extent and the economic viability of the deposit, in order to improve wellbeing status. The Petrozenith earth resistivity meter was employed using the Wenner Schlumberger electrode configuration. Five different locations were investigated within the study area, and a total of ten (10) Wenner-Schlumberger soundings were acquired in the area with a spread length of 200m along each traverse. The field data was inverted using the Zondres 2D software. Four (4) lithologic units were delineated namely; clay deposit with resistivity range of about 1 – 100Ωm, sand deposit with resistivity range of about 200-570Ωm, laterite deposits with resistivity distribution overlapping from about 1000-3162Ωm and gravel deposit whose resistivity distribution ranging from about 8000-10,000Ωm. Laterite deposit were found along traverses 1, 2 and 8 sampled at old sapele road Ekiosa at depths of 13-15m in TR 1, 10-15m in TR2, and 5m in TR8 at horizontal spread of 40-90m, 10-20m, and 20-170m respectively. Laterite deposit were found along traverses 3 and 4 sampled at presco road Obaretin at depths of 10-15m in TR3, and 10-15m in TR4 at horizontal spread of 140-160m, and 160-180m respectively and also laterite deposit were found along traverses 5, 6 and 7 sampled at Agbonmwoba primary school at depths of 5-15m in TR5, 5m in TR6, and 15-25m in TR7 at horizontal spread of 40-50m, 50-70m, and 110-120m respectively. Traverse 9 showed no evidence of laterite deposit from its resistivity pseudo-section. The result shows that laterite deposits along traverses 1, 2, 3, 4, 5, 7, and 10 are located almost at the same depth within the subsurface which implies that the subsurface geology distribution along these traverses are homogenous, and the laterite deposits along these profiles is commercially viable for exploitation, while the laterite deposits delineated along traverses 6, and 8 in the study area are not homogeneously distributed with those delineated along other traverse at the depth imaged and as such is not commercially viable. The results were further compared with borehole lithologic section drilled along TR5 in the area and both sections agreed. Thus 2D resistivity imaging gives a better lateral view of the subsurface layers than geo-electric section computed from 1D models because of its ability to give a continuous record of subsurface formations at greater depth.
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    Geochemical implications of hydrocarbon exploitation on the soil around the crude oil‑producing area of Uzere, Niger Delta region, Nigeria
    (Springer, 2025-11) Ibitoye, A.T.; Osisanya, W.O.; Imasuen, I.O.
    The crude oil sector in Nigeria continues to be a significant source of income and foreign currency. H0wever, operations related to oil exploration and production have the potential to seriously alter the environment, having an impact on ecosystems, water bodies, and human life. In many cases, pollution indices are viewed as a useful instrument for thoroughly evaluating contamination levels. Additionally, they may have a significant impact when evaluating soil quality and the forecast of long-term ecosystem viability, in the case of farmlands in particular. Atomic absorption spectrometry (AAS) was used to examine the heavy metal contents. Potential ecological risk index, geoaccumulation index, Nemerow pollution, pollution load index, contamination index (CI), and metal pollution index were the seven indicators employed in the study. The concentration of heavy metals such as manganese (Mn), iron (Fe), copper (Cu), zinc (Zn), nickel (Ni), lead (Pb), chromium (Cr), and arsenic (As) ranges from 11.9 to 184.1, 920 to 8870, 1.1 to 9.9, 9.7 to 60.4, 0.001 to 0.001, 2.4 to 34.7, 2.2 to 11.5, and 0.001 to 0.001 mg/kg, respectively. The correlation matrix showed that there were positive correlations between Mn and Ni, Fe and Cu, Zn, Pb, Cr, Cu and Cr, Zn and Pb, Cr, and Pb and Cr, while a negative correlation exists between Cu and Ar. PCA showed that 75% of the samples in PC1 have loadings; in PC2, 50% of the parameters have loadings; in PC3, 25% of the parameters have loadings; and in PC4, 12.5% of the entire parameter has loadings. Findings from the aforementioned indices revealed that the analyzed soil samples are polluted.
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    Petrophysical Analysis And Structural Mapping To Characterize Reservoir Of "Femtop Field", Niger Delta
    (Scholarlink Resource Centre, 2020) Oyanameh, O.E.; Ako, B.D.; Ibitoye, A.T.; Fagbemigun, T.S.; Osisanya, O.W.
    Unveiling the lithological and reservoir mapping, well correlation, petrophysical analysis and structural mapping of ʺFEMTOP FIELDʺ offshore Niger Delta,the data used includes;FieldBase Map, Four wells with Spontaneous Potential (SP), GR Log, Density Logs, Resistivity, andSeismic data in SEG-Y format. The Petrophysical analysis, Structural interpretation of „„Femtop field‟‟was carried out to identify the reservoirs and map faults from the 3-D seismic volume using Schlumberger (PETRELTM) software (i.e. Well data input, Delineation of lithology and Seismic to well tie). Time and depth structure maps in combination with well logs were used to map four reservoirs (A, B, C,and D), and four horizons (H1 to H4).Calculated petrophysical values of the reservoirs in each of the wells show that each formation has varying degree of petrophysical parameters. The average water saturation in these reservoirs is low, ranging from 27% to 45% with a corresponding hydrocarbon saturation ranging from 56% to 72%. Two major growth faults (F3 and F5), three antithetic faults (F1, F2 and F4) also were mapped. Therefore, structural closures identified as rollover anticlines, are displayed on the time/depth structure maps, suggest probable hydrocarbon accumulation at the downthrown side of the fault F3 attesting to the structural characteristics ofidentified reservoirs within the subsurface of study area. Hence, the integration of well logs with seismic data has largely enhanced the success of the petrophysical analysis and structural mapping in identifying theprobable growth faults and other structural closures responsible for hydrocarbon accumulation within the study area.
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    Petrophysical Evaluation of Hydrocarbon Potential of “OMA” Field, Niger Delta
    (International Journal of Research and Innovation in Applied Science (IJRIAS) / RSIS International, 2022) Olarewaju, M.A.; Osisanya, O.W.; Korode, A.I.; Ibitoye, A.T.
    The goal of this study is to maximize hydrocarbon reserves by evaluating reservoirs using derived petrophysical parameters, a common practice in the oil and gas industry. In order to complete this task, data (logs) from three Niger Delta onshore wells (OMA01, OMA02, and OMA 03) were used. Gamma-ray, resistivity, and neutron-density well logs were used in this study for lithology identification, fluid delineation, and hydrocarbon identification. Petrel and Rokdoc software were used for lithology identification and petrophysical analysis computation. The qualitative analysis revealed that the wells drilled through various lithologies contained sand and shale intercalations. Three in WellOMA01, Four in WellOMA02, and Two in WellOMA03, reservoirs were delineated. The field's petrophysical analysis was also produced. Shale's volume varies from 10% to 24%, its porosity from 14% to 26%, and its water saturation from 16% to 53%, while its permeability was relatively high. The highest hydrocarbon saturation (84%) was found in RES 01 from WellOMA03. The "OMA" field study revealed that there is a sizably high potential for hydrocarbons.
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    Unloading Mechanism: an Indication of Overpressure in Niger Delta („X‟-Field) using Cross Plots of Rock Properties
    (Seventh Sense Research Group, 2018) Eze, S.; Ideozu, R.U.; Ibitoye, A.T.; Osisanya, O.W.; Tiekuro, E.
    This study has investigated the unloading mechanism causes of overpressure and delineated the overpressure zones in X- field Niger Delta. The Niger Delta basin has many overpressure zones with different origins and depositional environments. This research used well log data from four (4) wells in X - Field Niger Delta. The logs include Gamma ray log, deep induction log, Density log, and sonic log. Densities and p-wave velocities derived from sonic log were cross plotted using the E log modelling tool embedded within Hampson-Russel software application. The crossplots were subjected to over pressure analysis. The results obtained revealed Unloading mechanism from 5341ft (1627.9m) to 6448ft (1965.4m) and overpressure zones from 4234ft (1290.5m) to 4788ft (1459.4m) about 168.86m thick within well 01, Unloading mechanism from 2289.5m to 2298.3m and overpressure zones from 2280.7m to 2285.1m within well 02, also Unloading mechanism from 3246m to 3335m and overpressure zones observed from 3157m to 3201m within well 03, and finally Unloading mechanism observed from 5970ft (1819.7m) to 6677ft (2035.1m) and overpressure zones observed from 4554ft (1388.1m) to 5262ft (1603.8m) (about 215.79m thick) within well 04. The results obtained in the over-pressured zones occurred in similar depths in parts of the Niger Delta Basin. The areas identified as overpressure zones should be critically examined prior to drilling to avoid blowout. This study has delineated overpressure zones and unloading intervals in the study area using well logs and crossplots.