Simulating CO2 Storage in Deep Saline Aquifers

This chapter presents the results of compositional reservoir simulation of a prototypical CO 2 storage project in a deep saline aquifer. The objective of the investigation was to better understand and quantify estimates of the most important CO 2 storage mechanisms under realistic physical conditions. Simulations of a few decades of CO 2 injection followed by 10 3 -10 5 years of natural gradient flow were done. The impact of several parameters was reviewed, including average permeability, the ratio of vertical to horizontal permeability, residual gas saturation, salinity, temperature, aquifer dip angle, permeability heterogeneity and mineralization. The storage of CO 2 in residual gas emerges as a potentially very significant issue meriting further study. Under some circumstances this form of immobile storage can be larger than storage in brine and minerals.

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