Carbon dioxide geological storage is an environmental action that reduces greenhouse gas (GHG) emissions in the atmosphere. Geological storage techniques are derived from the enhanced oil recovery (EOR) process, a well known technique used at large scales. In this process, the injection of CO2 into an oil or gas reservoir greatly improves the yield from the hydrocarbon reservoir.
The sequence of CO2 capture, transport and geological storage (the CTS chain) involves the initial capture of CO2 emitted from an industrial source by separating it from other gases using various technologies.
The CO2 is then compressed and transported, generally by pipeline, to the storage site where it will be injected into a selected geological reservoir.
A suitable reservoir for geological storage could be a deep saline aquifer, an oil or gas reservoir that has been depleted or is undergoing depletion, or unmineable coal seams. The CO2 is injected into the reservoir at a depth ranging from 800 to 5,000 metres below surface.
The site will be monitored throughout the CO2 injection process and monitoring will continue after the site has been closed to ensure its security and the safety of people and the environment. Monitoring is a crucial step in the proper functioning of a storage site and in gaining public acceptance for CCS projects.
First step: CO2 capture.
For more information on CO2, click here.
To see a CCS pilot project, click one of the links below: