Once the CO2 has been captured and transported it reaches the storage site in a condition similar to a liquid state, characterised by high density as compared to gaseous CO2. In order to keep it at this high density, the storage needs to be in a deep geological formation (at a depth of more than 800 metres) with suitable characteristics (highly porous and permeable rock called “storage rock”, covered in turn by “cap rock” preventing leakage towards the surface and guaranteeing its sequestration, as the storage rock absorbs the liquid CO2 in its pores).
Cortesy of ZEP
The most significant geological sites by abundance and capacity to store CO2 are:
If you would like more detailed information on CO2 storage please consult the Spanish CO2 Platform paper “Almacenamiento de CO2: tecnologías, oportunidades y expectativas”.
Research Plant for CO2 Injection in Soils, PISCO2