Such rock, known as basalt, might be better than other sites, such
as deep saline aquifers or nearly empty oil wells, because the rock not only stores CO2 but also over a relatively short period of years forms carbonate minerals out of it — in other words, limestone.
Not exact matches
Sequestration,
as envisioned in the report, involves capturing the CO2 from coal - fired power plants, compressing it into a liquid and injecting it
deep beneath the earth into old oil fields or
saline aquifers.
At a demonstration project in Japan, even a magnitude 6.8 earthquake didn't shake injected CO2 loose from a
deep saline aquifer; the wellheads did not so much
as leak.
There, the surface soil is also alkaline and low in salts, but
deeper it can turn
saline and acidic
as the «ice table» is approached, he said.
Pilot projects in Algeria, Japan, and Norway indicate that CO2 can be stored in underground geologic formations such
as depleted oil and gas reservoirs,
deep coal seams, and
saline aquifers.
Qualitatively, the slow ventilation is consistent with very
saline and very cold
deep waters reconstructed for the last glacial maximum (Adkins et al., 2002),
as well
as low glacial stable carbon isotope ratios (13C / 12C) in the
deep South Atlantic.
The other cause of potential leaks, old «legacy» wells, is also minimal because the
deep saline aquifer where Quest's CO2 will be stored has no oil or gas resources and
as a result has not seen drilling to any significant extent.