Browsing by Author "Olayinka, I. A."

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Governance structure and sustainability of university culture in Nigeria
(John Archers (Publishers) Ltd, 2022) Olayinka, I. A.
Petroleum exploration and production in Nigeria: a blessing or a curse?
(Professor Olukayode Oladipo Amund Retirement Committee, 2023) Olayinka, I. A.; Obere, F.
Oil exploration in Nigeria started in 1903; however, drilling activities started in 1951. In 1956, Shell-British Petroleum (BP) made a significant discovery of oil in the Oloibiri community (present-day Bayelsa State). Crude oil production began in 1957, and in 1960, 849,075 tonnes of crude oil were exported. To date, approximately 1,500 exploration wells have been drilled, with most of these being onshore, whereas the rest are in shallow offshore and deepwater. The exploration success rate has increased primarily due to three- dimensional seismic and sequence stratigraphy advancements. Oil and gas exports contribute significantly to Nigeria's economy, mainly federal government revenue and foreign exchange earnings. In this Chapter, the authors have examined the history of oil exploration in Nigeria, operating agreements, contributions of oil and gas to Nigeria's economy, the Petroleum Industry Act (PIA) (as the new framework for participation and regulation) and challenges faced during oil exploration and production in the country.
Sustaining a productive university system in the 21st century: the key elements in the debate
(UNIOSUN Publishing limited, 2022-09) Olayinka, I. A.
Use of block inversion in the 2-D interpretation of apparent resistivity data and its comparison with smooth inversion
(Elsevier, 2000) Olayinka, I. A.; Yaramanci, U.
The ability of a block inversion scheme, in which polygons are employed to define layers and/or bodies of equal resistivity, in determining the geometry and true resistivity of subsurface structures has been investigated and a simple strategy for deriving the starting model is proposed. A comparison has also been made between block inversion and smooth inversion, the latter being a cell-based scheme. The study entailed the calculation (by forward modelling) of the synthetic data over 2-D geologic models and inversion of the data. The 2-D structures modelled include vertical fault, graben and horst. The Wenner array was used. The results show that the images obtained from smooth inversion are very useful in determining the geometry; however, they can only provide guides to the true resistivity because of the smearing effects. It is shown that the starting model for block inversion can be based on a plane layer earth model. In the presence of sharp, rather than gradational, resistivity discontinuities, the model from block inversion more adequately represents the true subsurface geology, in terms of both the geometry and the formation resistivity. Field examples from a crystalline basement area of Nigeria are presented to demonstrate the versatility of the two resistivity inversion schemes.