Doctor of Philosophy (Ph.D.) Theses and Dissertations

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    Chemical studies on the deterioration of palm oil
    (Department of Chemistry, Obafemi Awolowo University., 1983) OKIY, Dere Arubore
    The work reported in this thesis is on the chemical changes which take place when palm oil is subjected to thermal deterioration and the effect on the nutritional value of leaf protein. The state of deteriorated palm oil on the nutritional value of leaf protein as determined by PER, BV, NPU and TD were examined; this was not worse than diets without the oil samples.
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    Physiological Ecology of diatoms in some freshwaters around Ile-Ife.
    (Department of Botany, Falcuty of Science, Obafemi Awolowo University., 1993) OKUSAMI, Victoria Bamidele
    An ecological study on diatoms was carried out on six water bodies both inside and outside the Obafemi Awolowo campus, Ile-Ife, (O.A.U) with a view to relating their occurrence and diversity with prevalent environmental conditions. There water bodies include Opa reservoir on O.A.U. campus, two permanent ponds on O.A.U. Teaching and Research Farm. Oduduwa College Fish pond in Ife town and two streams on Tonkere road near the University gate
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    The Biology of the fish genus clarias in Opa reservoir, Obafemi Awolowo University
    (Department of Zoology, Faculty of Science, Obafemi Awolowo University., 1995) ABAYOMI, Olatokunbo Solomon
    A study on the identification , distribution, food and feeding habits, pattern of reproduction, and fecundity , age and growth and types of parasites affecting the fish genus clarias was carried out in Opa reservoir between 1989 and 1992.
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    Capability development in adopting active technology transfer strategy in Nigeria Industries.
    (Department of Technology Management, Falculty of Technology, Obafemi Awolowo University., 1998) Ephraim Chukwuma OKEJIRI
    The main technology acquisition strategy of most developing countries including Nigerian is based on the concept of technology transfer which emphasizes importation of production technology. This development strategy which emerged post second world war era had roots in the revolutionary theory of social change.
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    Moss, surface runoff and associated sediments as indicators of metal and trace organic pollution in Lagos, Ile Ife and Osogbo areas
    (Department of Chemistry Obafemi Awolowo University, 2000) OGUNFOWOKAN Aderemi Okunola
    The levels of sediments and mosses (PAHs) and trace elemental composition of runoff and associated sediments and road side moss samples, Barbula lambarenesis (p.vard) were determined by Gas-liquid chromatography- mass spectrometry (GC_MS), Atomic absorption (AAS) and capillary Electrophoresis n(CE) techniques. The aims of the study were to develop a simple and efficient procedure for the GC_MS measurement and identification of PAHs in surface runoffs, sediments and mosses of Lagos, Ile-Ife and Osogbo areas determine areas
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    An evaluation of the Nigerian innovation system and technoloical capability building in the manufacturing sector.
    (Department of Technology Management Obafemi Awolowo University, 2005) OKE, Joseph Sunday
    This study evaluated the knowledge generation and utilization performance and the operational environment of the Nigerian innovation system with the aim of establishing the level of technological capability building in the manufacturing sector. In conclusion, the Nigerian innovation system was generally too weak to support sufficient technological capability building in the manufacturing sector due to factors such as low spending on R&D, low level of S&T human resources , poor state of research facilities and poor linkage between academic /research institution and firms.
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    Physico-Chemical and trace element characteristics of vegetation, soil and water in Bituminous sands deposit area of Ondo state, Southwestern Nigeria.
    (Department of Chemistry, Faculty of Science, Obafemi Awolowo University, Ile-Ife., 2007) Adedbiyi, Festus Mayowa
    Vegetation, soil and water (ground and Surface water) in bituminous sands deposit area of Ondo state, Southwestern Nigeria were analyzed for the physic-chemical characteristics and trace element contents with a view to providing baseline data for these parameters in the various ecological components and a framework for establishing of relationships between the chemistry of mineral deposits and the soil, water and vegetation in the study.
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    The application of seismic sequence stratigraphy in petroleum prospect generation and field appraisal in afam channel, Niger Delta.
    (Department of Geology, Faculty of Science, Obafemi Awolowo University, 2010) Freeborn Etegbalor OKPIKORO
    Discovery of Afam oil fields, Niger delta was based on 2D seismic data which delineated mainly structural traps. Recent studies indicate that there are additional reservoirs that are stratigraphically controlled in channel settings. This research is aimed at revaluating oil fields within the Afam Channel area through mapping and validating hydrocarbon reserviour facies, locate bypassed ones, identify new prospect areas and subdivides the Afam Channel sequence into lithostratigraphic hierarchies.
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    Purification and characterization of Arginase from the liver of land Tortoise.
    (Department of Biochemistry Obafemi Awolowo University, 2011) OKONJI Raphael Emuebie
    The study of the Physicochemical, catalytic, structural and immunological characteristics of arginase from tortoise, a uricotelic organism was undertaken in order to provide information which would demonstrate the differences between the ureotelic and uricotelic arginases. In conclusion, tortoise liver arginase was similar to those of uricotelics in terms of kinetic and physicochemical properties. The physiological role of the enzyme in uricotelics involved the conversion of ornithine to proline and glutamate
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    GEOPHYSICAL ASSESSMENT FOR CARBON DIOXIDE (CO2) SEQUESTRATION IN “IT” FIELD, NIGER DELTA, NIGERIA
    (Department Of Physics And Engineering Physics, Faculty Of Sciences, Obafemi Awolowo University Ile-Ife., 2022) ADENIKA Charles Itunu
    This study established the fault framework of theThis study established the fault framework of the reservoir environment, identified suitable reservoirs, determined petrophysical parameters of the identified reservoirs, estimated the storage capacity of the reservoirs and determined the sealing efficiency within IT field Niger Delta, Nigeria. These were with a view to assessing the suitability and utilization of IT field for implementation of geological CO2 sequestration. High resolution aeromagnetic, 3D seismic and well log data were used. The magnetic data were gridded, reduced to equator and upward continued to produce residual magnetic intensity (RMI) map. Quantitative processes were applied on the RMI to estimate the sedimentary thickness and delineate lineaments on a regional scale. Hydrocarbon reservoirs were mapped and their petrophysical parameters computed from well log data. Fault and horizon mapping were carried out on the vertical seismic sections to produce structural maps. The structural maps and petrophysical parameters obtained were used to determine the storage capacities of the identified hydrocarbon reservoirs. The calculated volume of shale (Vshale) was used to generate fault models which were used to evaluate the sealing efficiency of the mapped faults. Compressional wave velocity (Vp) and shear wave velocity (Vs) obtained from identified reservoirs and shales (caprocks) were used to compute, model and analyze geomechanical parameters to deduce the sealing efficiency of the identified reservoirs and caprocks. The results showed that the sedimentary thickness ranged from 2.5 km to 21.5 km with a mean of 10 km. The basement structures delineated trended majorly in the NE-SW direction and were deep seated structures which may not influence the overburden. Three sand reservoirs; RES-1, RES-2 and RES-3, were identified and mapped across six wells (IT-01 to IT-06). Results of petrophysical analysis revealed gross thickness values of 145.25, 98.86 and 474.94 ft; porosity values of 0.29, 0.22 and 0.27; hydrocarbon saturation values of 0.29, 0.45 and 0.64; permeability values of 3890, 243.24 and 2401.95 mD; and Net-to-Gross values of 0.90, 0.36 and 0.69 for RES-1, RES-2 and RES-3 respectively. The storage capacity computed from the petrophysical and volumetric analyses, and storage efficiency factors for RES-1, RES-2 and RES-3 using DOE model (1% and 4%) revealed 49.42 Mtons and 197.77 Mtons; 16.00 Mtons and 64.02 Mtons, and 1.35 Gtons and 5.67 Gtons; respectively. According to Goodman’s model (10% and 15%), RES-1, RES-2 and RES-3 were estimated to have storage capacity of 494.30 Mtons and 741.45 Mtons; 160.00 Mtons and 240.07 Mtons, and 13.52 Gtons and 20.29 Gtons; respectively. RES-3 was adjudged the reservoir with the largest storage capacity. Fault seal analyses revealed that fault sealing percentages ranged from 20 – 60 %, indicating that the reservoirs are assisted by moderately sealing faults which are capable of sealing the reservoir for a longer period. Geomechanical analyses revealed that the identified reservoirs and caprocks are ductile and possess sufficient strength to withstand external pressure. The study concluded that IT field contain reservoirs which have moderate fault seal capacity, appreciably thick caprocks with very good storage capacity thereby indicating that the field is capable of hosting CO2 sequestration. xviii identified suitable reservoirs, determined petrophysical parameters of the identified reservoirs, estimated the storage capacity of the reservoirs and determined the sealing efficiency within IT field Niger Delta, Nigeria. These were with a view to assessing the suitability and utilization of IT field for implementation of geological CO2 sequestration. High resolution aeromagnetic, 3D seismic and well log data were used. The magnetic data were gridded, reduced to equator and upward continued to produce residual magnetic intensity (RMI) map. Quantitative processes were applied on the RMI to estimate the sedimentary thickness and delineate lineaments on a regional scale. Hydrocarbon reservoirs were mapped and their petrophysical parameters computed from well log data. Fault and horizon mapping were carried out on the vertical seismic sections to produce structural maps. The structural maps and petrophysical parameters obtained were used to determine the storage capacities of the identified hydrocarbon reservoirs. The calculated volume of shale (Vshale) was used to generate fault models which were used to evaluate the sealing efficiency of the mapped faults. Compressional wave velocity (Vp) and shear wave velocity (Vs) obtained from identified reservoirs and shales (caprocks) were used to compute, model and analyze geomechanical parameters to deduce the sealing efficiency of the identified reservoirs and caprocks. The results showed that the sedimentary thickness ranged from 2.5 km to 21.5 km with a mean of 10 km. The basement structures delineated trended majorly in the NE-SW direction and were deep seated structures which may not influence the overburden. Three sand reservoirs; RES-1, RES-2 and RES-3, were identified and mapped across six wells (IT-01 to IT-06). Results of petrophysical analysis revealed gross thickness values of 145.25, 98.86 and 474.94 ft; porosity values of 0.29, 0.22 and 0.27; hydrocarbon saturation values of 0.29, 0.45 and 0.64; permeability values of 3890, 243.24 and 2401.95 mD; and Net-to-Gross values of 0.90, 0.36 and 0.69 for RES-1, RES-2 and RES-3 respectively. The storage capacity computed from the petrophysical and volumetric analyses, and storage efficiency factors for RES-1, RES-2 and RES-3 using DOE model (1% and 4%) revealed 49.42 Mtons and 197.77 Mtons; 16.00 Mtons and 64.02 Mtons, and 1.35 Gtons and 5.67 Gtons; respectively. According to Goodman’s model (10% and 15%), RES-1, RES-2 and RES-3 were estimated to have storage capacity of 494.30 Mtons and 741.45 Mtons; 160.00 Mtons and 240.07 Mtons, and 13.52 Gtons and 20.29 Gtons; respectively. RES-3 was adjudged the reservoir with the largest storage capacity. Fault seal analyses revealed that fault sealing percentages ranged from 20 – 60 %, indicating that the reservoirs are assisted by moderately sealing faults which are capable of sealing the reservoir for a longer period. Geomechanical analyses revealed that the identified reservoirs and caprocks are ductile and possess sufficient strength to withstand external pressure. The study concluded that IT field contain reservoirs which have moderate fault seal capacity, appreciably thick caprocks with very good storage capacity thereby indicating that the field is capable of hosting CO2 sequestration.