Abstract
The types of geological structures suitable for CO2 storage are saline aquifers (SA) and depleted hydrocarbon reservoirs (DHR). It is well-known that a direct comparison is often somewhat misleading; the preferences depend on many factors, including availability, logistical and economic concerns. However, advantages and disadvantages in terms of various engineering aspects are often compared. We summarize the state-of-the-art of knowledge on the use of SAs and DHRs. Physical processes involved, analytical and numerical approaches for capacity and injectivity estimations, containment, wellbore and near-wellbore challenges and logistical options are discussed for both options. Comparisons are made considering engineering design for the onshore and offshore cases together with the preliminary economics.
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