Carbon sequestration in sedimentary formations: A case study of the Niger Delta Basin, Nigeria

The study outlines the sequences adopted for carbon sequestration in sedimentary formations while leveraging on Gabo field in the Niger delta for detailed storage capacity and potentials. Stratigraphic profiling and mapping of the sedimentary layers to identify potential storage formations e.g., sandstones, carbonates, reservoir characterization i.e. studying porosity, permeability, depth, thickness, and lateral extent, seal, integrity analysis; identifying overlying impermeable formations (e.g., shale) that prevent CO₂ escape. Also, fault and fracture mapping to assess chemical reactivity between CO₂, brine, and reservoir rocks, stress field analysis etc. The comprehensive data needed are such that should meet the geological criteria namely permeability, porosity, cap rock, reservoir depth, structural stability and salinity. The results obtained from the well correction analysis demonstrate the effectiveness of the correction techniques in improving the accuracy and reliability of the well log data. By aligning the well data with the expected geological features, the corrected well log data enhances correlation with seismic data, aids in reservoir characterization, and improves formation evaluation. The results significantly showed the reservoir's geological characteristics, fluid dynamics and potentials for hydrocarbon accumulation, carbonstorage and retention. Sands A, B, C and D were found to exhibit favourable characteristics for CO2 storage. It contributes to a more comprehensive understanding of the geological and petrophysical characteristics of the studied area.