Browsing by Author "Johnson, LM"
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Item Aeromagnetic Mapping of Basinal Structures over Part of Niger Delta, and its Implication for Hydrocarbon Migration and Accumulation(Faculty of Science and Science Education, Adamawa State University, Mubi, 2015) Ali, I; Edino, F; Ibrahim, KO; Johnson, LM; Folorunso, IOAeromagnetic imaging over part of Niger Delta was carried out with a view to interpret the anomalies over the area and to equally delineate the structural features suitable for hydrocarbon accumulation within the study area. Digitized composite aeromagnetic data covering the study area were used in this study. Data enhancement techniques such as second vertical derivative, first horizontal derivative and analytic signal were applied to enhance deep seated structures. Results of the Spectral Analysis revealed that the average thickness of the sediments vary from 4.8 to 10.5 km, large enough for hydrocarbon accumulation. The derivative maps revealed parallel to sub-parallel trending NE-SW fracture zones in the basement underlying the study area, coinciding with the landward extension of the deep oceanic Chain and Charcot fracture zones. Hence, the identified lineaments (faults or lithologic contacts) and structures in the area can be attributed to the tectonic setting of the area and probable migratory routes for hydrocarbon migrationItem Structural and Qualitative Analysis of Solid Minerals (Marble) in Selected Locations in Nigeria(Nigerian Institute of Physics, 2013) Alabi, AB; Olatunji, S; Babalola, OA; Nwankwo, LI; Johnson, LM; Odutayo, JO; Alabi, AMarbles are formed from the recrystallization of limestone or dolomite during metamorphism and occur as a coarse-grain rock composed of interlocking calcite crystals. The structural and porosity analysis of some selected Nigerian marbles were investigated with a view of establishing crystal configuration and constituents of the marble in Nigeria namely: Igbeti, Oyo State; Olayinka, Kwara State; Jakura, Kogi State; Biribiri, Niger State and Takalafia, Nassarawa State. The samples were examined by X-ray diffraction which confirmed the presence of CaCO3 in all the samples. Other constituents present are Calcium Magnesium, Calcium Magnesium Carbonates, and Magnesium Carbide. The average grain sizes of the Samples are 32.15, 31.42, 31.47 and 30.95 nm from Igbeti, Olayinka, Biribiri, Takalafia, and Jakura respectively. The samples were further examined by density profiling to determine the porosity of the marble samples. The comparison of the dry and wet density of the samples in percentage change in density revealed the porosity of all the samples and it was deduced that the marble sample has different pore size due to their formation processes. The porosity for the samples are as follow: from Igbeti (69%), Biribiri (62.4%), Takalafia (24.9%), Olayinka (10.3%), and Jakura (13.8%).