What is carbon storage?

Carbon storage – also known as geosequestration – is one component of carbon capture and storage and involves safely storing captured, liquefied, and transported carbon dioxide (CO2) deep underground. Carbon storage offers the greatest potential for permanent removal of CO2.

Where can CO2 be stored?

CO2 can be stored in different geological sites, including saline water-saturated rocks, and depleted oil and gas fields. Geological storage of CO2 requires rocks to have enough porosity – which determines how much CO2 that can be stored – and permeability, which is a measure of how well the pores within these rocks are connected, allowing the CO2 to flow through the rock.

Depleted oil and gas fields have already proven their ability to store hydrocarbons over millions of years, and have a similar ability to store CO2.

Is carbon storage safe?

Yes. Sites are carefully monitored during and long after the CO2 is injected underground. Technologies and protocols for monitoring and verification are used to track the CO2 migration within porous rock formations and ensure that the injected CO2 remains trapped in their reservoirs. Extensive modelling of carbon storage shows that carbon leakage over 1000 years can be limited to less than one per cent.

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