used in this particular example the cryogenic flood fluids may be warmed by other methods including but not limited to the various methods used in thermal recovery in situ combustion wet combustion and fire flooding for example the injected cryogenic fluid e g lng 2 can be heated with an electrical heater a seawater heat exchanger or a surface combustion fired heat exchanger this geothermal energy 18 flows into subterranean reservoir 6 and mixes with the fluids of reservoir 6 during injection geothermal energy 18 mixes with the reservoir fluids and the injection fluids to form a series of flood banks exemplified by 16 17 19 and 24 of vaporizing cryogenic fluid like natural gas 2 reservoir fluids and injected water as the liquid natural gas is injected into wellbore 5 and fluids are drawn to the surface from the reservoir 6 through wellbores 7 and 8 another flood bank is formed at 24 as the flood banks 16 17 24 and 19 advance in reservoir 6 other fluids in reservoir 6 are driven into the production wellbores 7 and 8 where they are transduced to surface through the wellbores prior to the arrival of the actual break through of the injected fluid a series of flood banks having different fluid phases and different mixes of fluids comprising injected fluids and reservoir fluids depicted as flood bank 16 17 24 and 19 arrive at the production wells 7 and 8 additionally fig1 shows two production wells 7 and 8 and one cryogenic flood fluid injection well 5 a skilled artisan would readily recognize that multiple injection and production wells may be within the spirit and scope of the present invention likewise other variations such as horizontal wells may be placed in the reservoir 6 for.