How do we store CO2 safely and permanently underground?
By exploiting the same trapping mechanisms used by nature to store CO2, gas and oil for millions of years; and by using existing technology to transport and inject the CO2. This technology has already been used for over 30 years by the oil industry to improve oil extraction.
Storage starts by pumping liquid CO2 into a carefully chosen reservoir. There are two main types: deep saline aquifers (which contain undrinkable salt water) and depleted oil and gas fields. Both have the same key geological features for storing CO2 safely and are usually sandstone or limestone.
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Inside CCS: the workings of CO2 capture, transport & storage