CO2 injection ideally occurs in a geologic location and pressure where it infuses and binds with the existing rock structure and becomes a carbonate, such as limestone or dolomite.
Shale structures in coal and oil deposits are generally already fully saturated with carbonates, so not the site for permanent carbon storage.
The injection of CO2 into oil bearing strata is simply a method to increase production of oil and gas by maintaining well pressure. This typically occurs at the gas separator which removes CO2 from the natural gas with the gas then pumped into a truck line and the CO2 re-injected back into the well.
Quadrillions of tons of carbonates are locked into this limestone - Once formed under pressure it's completely inert and cannot be released without heating it in a kiln above 1,600 degrees F.
Locking CO2 away as a rock adds 20% to the price of natural gas. It's a no brainer.
Life in the oceans creates this same process with formed carbonates dropping to the bottom. But this process is ironically being diminished by excess CO2 dissolved in the water, becoming carbonic acid which makes the formation of carbonates by sea creature more difficult.
Qadrillions of tons of carbon dioxide hiding in plain site in Italy's Dolomite Mountains
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