Carbon dioxide-based geothermal energy generation systems and methods related thereto

A system comprising:

• one or more injection wells for accessing one or more underground reservoirs, the one or more reservoirs being at one or more first temperatures and containing at least one native fluid, the native fluid including a solution comprising methane, each of the one or more injection wells having an injection well reservoir opening in fluid communication with at least one of the one or more reservoirs;
• one or more production wells, each having a production well reservoir opening in fluid communication with at least one of the one or more reservoirs;
• a working-fluid supply system for providing a non-water based working fluid to the one or more injection wells at a second temperature lower than the first temperatures,
• wherein exposure of the non-water based working fluid to the native fluid causes at least a portion of the methane to come out of solution with the native fluid to form a production fluid of at least a portion of the non-water based working fluid and the portion of the methane,
• wherein exposure of the mixture to the first temperatures heats the production fluid to a third temperature that is higher than the second temperature, wherein the production fluid enters one or more of the production well reservoir openings;
• and
• an energy recovery apparatus in fluid communication with the one or more production wells, the energy recovery apparatus including;
• at least one separation apparatus that separates at least a portion of the methane from the production fluid,
• a heater that combusts at least a portion of the separated methane and heats the production fluid to a fourth temperature that is higher than the third temperature to provide a heated production fluid, and
• one or more expansion devices and one or more generators, one or more heat exchangers, or a combination thereof that convert energy contained in the heated production fluid to electricity, heat energy, or a combination thereof.