ALEXANDRIA, Va., June 19 -- United States Patent no. 12,331,618, issued on June 17.

"System and method for carbon dioxide storage and geothermal heat mining in depleted gas, gas condensate or oil reservoirs" was invented by Hon Chung Lau (Bellaire, Texas) and Kai Zhang (Calgary, Canada).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for storing CO2 includes identifying a depleted or partially depleted gas, gas condensate or oil reservoir having a plurality of injection wells and a plurality of production wells. The reservoir is then depleted. Once the reservoir is depleted or partially depleted, enhanced oil recovery and/or enhanced gas recovery is then performed on the reservoir where a first quanti...