Evaluates CO2 storage efficiency in depleted hydrocarbon reservoirs, implying enhanced predictability.
Recent joint efforts led by the international financial corporation (IFC) with strong support from the Federal Government of Nigeria and various industrial and policy stakeholders has produced the Nigerian CO 2 Storage Atlas, sorting prospective geological storage sites. However, the storage efficiency factors applied to the estimated resource capacity to provide low, medium and high resource estimations may not be a true representation for the underground CO 2 storage space, especially for depleted hydrocarbon reservoirs, in the Nigeria rich oil province that is very porous and permeable. We therefore present assessment of CO 2 storage potential of some depleted hydrocarbon reservoirs in the Niger Delta, derive specific approximate CO 2 Storage efficiency factors for these reservoirs, and develop a model for determining site-specific CO 2 storage efficiency factor. Comparison of results from various approaches – production-based, volumetric- based with varying CO 2 storage efficiency factors obtained from the new model and previous works, and an enhanced analytical simulation tool (EASiTool) was also carried out. The newly developed model for determining site-specific CO 2 storage efficiency factor can help improve the predictive capability of the volumetric method for CO 2 storage potential estimates, especially for depleted oil reservoirs in the Niger Delta.
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Livinus et al. (2026) studied this question.
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