Abstract:

CO₂ geological storage belongs to environmental protection projects, suitable sites are the important base for CO₂ sequestration safely for long period of time. It is just the beginning stage of CO₂ geological storage in China, there is no mature technical methodological system. So relevant research is being carried out in this paper. Site selection of CO₂ geological storage should satisfy the principles that effective storage capacity is large enough, safe, economy, the site selection should meet the general conditions for environmental protection engineering standard, and the site should not be affected by adverse geological factors. Site selection of CO₂ geological storage in deep saline aquifers could use multi-scale objective approximation method，including planning and engineering stages. Planning site selection is divided into national, basin and target grade stages. Engineering site selection to ensure the suitable locations according to targets selection, comprehensive geological survey, drilling, injection test and selected site comprehensive evaluation. Ranking multifactor index method on the basis of AHP could be used for CO₂ geological storage site selection, and an index system is established, which provides guidance for site selection of CO₂ geological storage engineering in deep saline aquifers of China.

Key words: saline water, deep saline aquifer, CO₂ geological storage, site selection method, multi-scale objective approximation