A hydrocarbon bearing formation (304) which is heated using a automatic
impedance matching (181) capacitive radio frequency dielectric heating
(334) in situ process. Hydrocarbons or other substances natural to a
hydrocarbonaceous formation may be produced by heating specific chemical
compositions with or without the use of a carrier medium (320) in a
subterranean reservoir. Hydrocarbons or other substances natural to a
hydrocarbonaceous formation are heated by maintaining specific chemical
compositions in an alternating current electrical field generated by a
radio frequency signal. As the targeted chemical compositions increase in
temperature, maximum energy is delivered using automatic impedance
matching to adjust the rate of the heating process.