Identification and selection of sitesThe selection of potential storage sites suitable for significant volumes of CO2 involves the consideration of geological, regulatory, environmental and social factors. The initial stage in selecting possible storage sites involves country-wide screening of sedimentary basins which have the potential to store CO2 in pore space in rock such as limestone and sandstone or via adsorption onto coal.
At a country-wide level, appropriate sedimentary basins can be screened and ranked according to their suitability for CO2 storage. Existing geological information can be used to evaluate the size and thickness of the basin, the tectonic setting of the basin and the intensity of faulting within the basin. Other factors influential in producing a list of possible sites are hydrodynamic and geothermal regimes, accessibility, the existence of petroleum and coal resources and the level of maturity of the industry.
Once a suitable basin is identified, more detailed and localised assessments are carried out as indicated in the diagram, with the amount of data required to make a more accurate assessment of the storage capacity increasing at each stage.