Large-Volume CO2 Storage Project

WESTCARB is conducting site characterization at two locations in the Central Valley of California in preparation for a large-volume demonstration of CO2 storage. Over a nominal four-year period, following receipt of all necessary permits and approvals, WESTCARB will oversee the injection of a pre-commercial volume of CO2 into a saline formation nearly two miles beneath the ground surface.

The Central Valley offers geologic features favorable to carbon storage: thick and extensive porous rock formations overlain by impermeable layers called caprocks. Under these conditions, CO2 can be injected into the pore spaces of the deep-lying formations, where it is contained by “trapping” mechanisms such as dissolution and mineralization, as well as by the sealing rock layers above.  

Site characterization at the two locations will provide detailed information on the geologic conditions in these areas and will lead to a final site selection. During injection operations, WESTCARB researchers will use proven oil industry techniques and new research-grade instruments to “see” the injected CO2 as it is distributed underground. The project results will provide the basis for more accurate estimates of the CO2 storage capacity of saline formations in California and other western states. Monitoring to verify that the CO2 remains securely stored will continue after injection operations cease, as part of an environmental stewardship phase of the project.