Scholarly works in the Department of Geophysics

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Browsing Scholarly works in the Department of Geophysics by Author "Ajibade, F.Z."

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    Aeromagnetic Interpretation of Basement Structures and Geometry in Parts of the Middle Benue Trough, North Central, Nigeria
    (Bilingual Publishing Co., 2022-11-30) Esho, O.O.; Osisanya, W.O.; Ibitoye, T.A.; Ajibade, F.Z.; Tokunbo, S.F.
    The research of an analysis of aeromagnetic data collected in the middle Benue Trough in north-central Nigeria is presented. A detailed analysis of basement structures is conducted in order to identify regions with high hydrocarbon potential that is different from those discovered by earlier researchers. Aeromagnetic data were filtered by using the Butterworth and Gaussian filters, transformed by engaging the reduction to the equator technique, and subsequently enhanced. To estimate magnetic basement depths at various places throughout the basin, the Euler deconvolution depth weighting approach was used. Eleven (11) sub-basins with depths ranging from –2000 m to –8000 m were also identified by Euler’s findings. The sub-basins trend in the NE-SW direction while the average sediment thickness is found to be more than 3 km. The extracted structural features indicate areas like Kadi Blam and Kado areas in the southeastern part and Ogoja and Obudu in the southern part of the study area as regions with high structural densities. These areas coincide with the areas delineated as the sub-basins. The cross-sections generated reveal depressions caused by the action of some tectonic activities in the area. This study identified undulating basement topography believed to be due to tectonic activities as well as five areas that are possible targets for hydrocarbon exploration.
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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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    Evaluation of Residual Geo-mechanical Characteristics of Rocks from Akure, Ado Ekiti and Ikare-Akoko Quarries in Southwest Nigeria
    (University of Port Harcourt, 2025) Oluwadero, T.A.; Osisanya, W.O.; Ajibade, F.Z.
    The objective of this paper is to evaluate the Residual Geo-mechanical Characteristics of Rocks from Akure, Ado-Ekiti and Ikare-Akoko Quarries in Southwest Nigeria using appropriate standard techniques. Data obtained show that residual ultimate compressive strength (UCS) values under in-situ circumstances were, in order, 70.56 MPa, 72.9 MPa, and 76.27 MPa. It was shown that when the concentrations of acid and base in the immersion solution increased, the samples' UCS decreased. Compared to samples with coarser grains, those with finer grains (as determined by the microstructure analysis) retained a comparatively higher UCS value even after being submerged in an acidic and alkaline medium. The samples that were soaked in 0.75M, 1.5M, and 3.0M of acid and base showed varying degrees of deterioration during the second wetting cycle in the water medium, despite not being detected to be damaged during the first cycle. However, the durability was found to decrease much more when the medium was turned acidic and alkaline.