Geothermal heat recovery from high-temperature, low-permeability geologic formations for power generation using closed loop systems

A method for producing power, comprising:

• providing a closed loop system including an injection zone, a heat exchange zone for heating a fluid contained within the closed loop system, and a production zone, wherein the heat exchange zone or a portion thereof is disposed within a subterranean region comprising hot impermeable rock not containing significant natural or man-made fractures, fissures, or voids and having a temperature of at least 350° C., the subterranean region being within a plastic zone or within 1000 meters of the plastic zone, the plastic zone having a temperature gradient of at least 80° C. per kilometer depth;
• injecting the fluid into the injection zone;
• circulating the fluid through the heat exchange zone to produce a heated fluid;
• recovering the heated fluid from the production zone;
• and
• converting thermal energy contained in the recovered heated fluid in a power production facility.