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.
Livinus et al. (Wed,) studied this question.