Browsing by Subject "Gulf of Guinea"
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Item Development and Implementation of a Composite Model for Wave, Circulation, and Sediment Processes in Ibaka Deep Seaport in Nigeria(2014-06-20) Paul, Ephraim UdoIn-??depth knowledge of nearshore wave, circulation, and sediment processes are vital to effective and efficient management, operation, and regulation of ports and harbors. The scientific knowledge of these processes is currently lacking in Ibaka, Nigeria and this work was designed to assess these processes, thereby filling the existing gap in the literature. Even after seven decades of discovery of Ibaka bay as a leading natural harbor in Nigeria, no proactive efforts have been made to harness this resource. This dissertation aimed at developing a composite modeling system that would provide accurate and reliable information on circulation and sediment processes in Ibaka. This information will facilitate the speedy development of the deep seaport for economic empowerment of both local residents and the state. This study has three segments: field experiments, numerical experiments and data analyses. NearCoM-??TVD was chosen as the base model for this study because of its efficiency, accuracy, and robustness in simulating the processes of interest in Ibaka. This study has undertaken a detailed investigation of the impacts of different channel designs on the erosion and/or accretion of adjacent Ibaka beach and provided the optimum channel size and location. Maps and time series of wave action attenuation based on the optimum channel design have been produced. Analyses of relative contribution of various forcing mechanisms to the total sediment budget showed that wave height variations have the greatest impact on sediment transport in Ibaka.Significant wave height above 1.0m initiated sediment transport and morphological changes in Ibaka. The effects of wave-??current interactions on sediment processes have been investigated and found to be significant for wave heights near 1.0m in Ibaka bay. Examination of seasonal bias on sediment processes showed that only rainy season (April to October) wave climate caused sediment transport in the bay. Reduction of wave action, due to the dredged channel, resulted in wave refocusing towards the nearby Tom Shot Island. Finally, a five-??year maintenance dredging time window has been estimated for this port and harbor site.Item Geological Modeling of Dahomey and Liberian Basins(2010-01-16) Gbadamosi, Hakeem B.The objective of this thesis is to study two Basins of the Gulf of Guinea (GoG), namely the Dahomey and the Liberian Basins. These Basins are located in the northern part of the GoG, where oil and gas exploration has significantly increased in the last 10 years or so. We proposed geological descriptions of these two Basins. The key characteristics of the two models are the presence of channels and pinch-outs for depths of between 1 km and 2 km (these values are rescaled for our numerical purposes to 600- m and 700-m depths) and normal faults below 3 km (for our numerical purposes we use 1 km instead of 3 km). We showed that these models are consistent with the plate tectonics of the region, and the types of rocks and ages of rocks in these areas. Furthermore, we numerically generated seismic data for these two models and depth-migrated them. We then interpreted the migrated images under the assumption that the geologies are unknown. The conclusions of our interpretations are that we can see clearly the fault systems in both models. However, our results suggest that seismic interpretations of the channels and pinch-outs associated with the geology of the Dahomey and Liberian Basins will generally be difficult to identify. In these particular cases, we missed a number of channels and pinch-outs in our interpretations. The limited resolution of seismic images is the key reason for this misinterpretation.Item Petroleum Service Projects in the Gulf of Guinea(2011-10-21) Ken-Worgu, Kenneth ChukwumekaThe goal of this record of study is to examine the major facets involved in managing several petroleum service projects located in three different countries in the Gulf of Guinea simultaneously, while effectively engaging in business development activities for the Oil and Industrial Services Group (OIS). This work also furnishes adequate background on related subject matters to enable understanding of the projects presented. The petroleum services sector is the back bone of the oil and gas industry. Services companies are vital to the success of all petroleum and energy producers in the USA, the Gulf of Guinea and the world. There is a need and demand for these service companies because they play various roles such as logistics, drilling, construction, dredging, pipe laying, procurement, food supply, human resource supply, etc. The Gulf of Guinea comprises of countries from west and central Africa. This project was limited to Nigeria, Equatorial Guinea and Cameroon. This area holds the largest petroleum reserves in Africa and plays a vital role in the global supply of petroleum. The Oil and Industrial Services Group (OIS), plans to establish herself as one of the leading petroleum service companies in this gulf. To manage this expansion, I have taken the role of Gulf of Guinea manager to apply my background as a petroleum engineer as well as my business skills to build a successful division of the company. This work provides a record of study of the management of services, projects and contracts carried out by the OIS group in the gulf of Guinea. The following are the specific projects in the Gulf of Guinea that I participated in: Managing delivering, maintenance and marketing of offshore vessels, Offshore pipe laying project, Integrated pipeline maintenance project, Development a petroleum technical training facilities, Agbami pipe insulation project, Engineering lift project and Capital budgeting analysis for potential investments. The details of the specific tasks of the job, including objectives, description, managerial role, nontechnical aspects, approaches, information sources, discussions and contributions are projected in the body of this literature.