Evaluation of reservoir rocks in Gabo Field, Niger Delta for CO2 storage and retention

Abstract

The study was conducted to evaluate the reservoir rocks for carbon storage and retention using seismic and well log data. A multidimensional sequence stratigraphic framework was constructed, estimated the spatial and lateral continuity of reservoir sands, deduced petrophysical properties of offshore sands and interpreted gross depositional settings and processes. Well-to-seismic tie analysis was performed to verify the accuracy of seismic data, while well correction analysis was carried out to adjust well data for errors and inconsistencies. Fault and horizon interpretations were conducted, revealing regional faults, major counter-regional faults, and reverse faults. A comprehensive 3D analysis was performed to assess the facies composition, porosity distribution, and water saturation in the field reservoirs. Sand facies dominated the reservoir, indicating favourable conditions with high porosity and permeability. The results significantly showed the reservoir's geological characteristics, fluid dynamics and potentials for hydrocarbon accumulation, carbon storage and retention. Sands A, B, C and D were found to exhibit favourable characteristics for CO₂ storage.