115 separated water stream 115 may be used as water injection into injection well 108 a 108 b recovered gas 116 which may include co2 co h20 ch4 light hydrocarbons h2 and h2s is introduced to separator 117 the exact composition of the recovered gas will depend on the nature of the produced oil and the recovery process itself the recovered gas will be substantially free of nitrogen due to the oxygen injection separator 117 may include but is not limited to the following processes adsorption absorption cryogenic systems and membrane systems the adsorption systems may include but are not limited to rectisol selexol or amine wash systems in one embodiment the membrane system or the combination of cryogenics and membrane system is preferred a high lhv fuel gas 118 and a stream that is predominantly composed of co2 119 are recovered from separator 117 the high lhv fuel gas 118 may optionally be is further purified in gas purification unit 120 the purified high lhv gas 121 may be combined with natural gas stream 109 prior to admission to combustion device 110 after combusting the oxygen stream 102 with the fuel gas streams 109 121 combustion device 110 outputs power 122 to the process compression facility and also outputs an.