Deep saline aquifer is a major geological storage site for CO₂. The geochemical behaviors of deep saline aquifers differ each other due to their different geological backgrounds and geochemical environments in their geological histories. This paper reviews the research progresses on geological storage space and storage capacity, types of geological storage and chemical behaviors of isotopelabeled CO₂ in saltwater layer. It is shown that though current researches on CO₂ geological storage have made progresses in phenomenon experiments, simulations and field experiments, many theoretical and technical problems of the behaviors of CO₂ after injecting underground remain unresolved. The choice of monitoring methods for CO₂ geological storage mainly depends on the specific site condition and risk profile. Future technological developments may focus on the evaluation of storage site and monitoring technologies of reservoir response.

capture and storage of CO₂  /  geological storage  /  deep saline aquifer  /  isotopes