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Influence of Reservoir Variables on the Onset of Thermosolutal Convection in the Niger Delta

	International Journal of Scientific Research and Engineering Development (IJSRED)	Full Text:
	Published Issue : Volume-3 Issue-5
	Year of Publication : 2020
	Unique Identification Number : IJSRED-V3I5P70
	Authors :Onengiyeofori A. Davies, Chigozie Israel-Cookey, Etim D. Uko, Mathew A. Alabraba
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Abstract :

Capturing and storing anthropogenic carbon dioxide (CO2) in deep geologic reservoirs promises to be a potential solution in the fight against drastic climatic change as a result of global warming driven by the presence of excess greenhouse gases (CO2 inclusive) in our atmosphere. The convective dissolution of the sequestered CO2 in the ambient brine is known to be one of the mechanisms in place to trap the sequestered CO2. This study is aimed at investigating reservoir parameters that could serve to influence convective mixing post sequestration. To do this, linear stability analysis, relative to a set of hydrodynamic governing equations for a heterogeneous media where thermal and solutal fields contributed to the buoyant field in opposing manner, was carried out. Variables like permeability anisotropy ratio, porosity, Prandtl number and solutal Rayleigh number were investigated within this study relative to the onset of convective instability as defined by a 2D plot of thermal Rayleigh number and perturbation wave number. Results showed that convective instability, convective mixing in essence, was hastened by increasing anisotropy ratio, porosity and Prandtl, while an increasing solutal Rayleigh number delayed the onset of convective instability, thereby delaying convective mixing.