A method of electromagnetic heating in situ recovers liquid hydrocarbons from an oil shale formation containing kerogen in an inorganic matrix where the formation is substantially impermeable to fluids under native conditions. A block of the oil shale formation is substantially uniformly heated in situ...http://www.google.com/patents/US4485869?utm_source=gb-gplus-sharePatent US4485869 - Recovery of liquid hydrocarbons from oil shale by electromagnetic heating in situ
