(NO9804295-A)   NOVELTY - Carbon dioxide-rich (CO2) and hydrogen-rich (H2) gas streams are produced by feeding natural gas and water to a reforming reactor, and converting to synthesis gas with an oxygen-containing gas; shifting the gas stream having reduced carbon monoxide and the amounts of CO2 and H2 are increased by reaction of water; and separating the gas stream into a CO2-rich and a H2-rich gas streams.    USE - For production of CO2- and H2-rich gas streams. CO2-rich gas stream produced by the process is used for injection into marine formations. H2-rich gas stream produced by the process is used for hydrogenation, as a source of energy/fuel cells and for the production of electricity.(claimed)    ADVANTAGE - The present invention provides an increased pressure that gives increased reaction for each volume unit in reformer and shift reactor, and further a reduced compression work of CO2 by a possible reinjection or deposition. In addition, increased pressure gives reduced compression work for feed to the gas turbine. In the reformer there is high primary formation of CO2 as a result of high pressure. Another advantage is a simplified design and operation of a possible gas turbine for combustion of the H2-rich gas stream as a result of a certain slip of CH4 in the reformer, CO in the shift reactor and CO2 in the separation step. The use of air or oxygen enriched air in the case of an autothermal reformer (ATR) and partial oxidation (POX) give savings in oxygen units and gives a simplified design and operation of ATR and gas turbine. A certain slip, i.e. not reacted gas component, makes low temperature shift and methanation unnecessary. In the present invention it might be necessary to supply steam to the shift reactor. A certain slip of CO2 in the present invention simplifies the separation process. If the separation is carried out with amine washing, a moderate pressure release might be sufficient.    DETAILED DESCRIPTION - Carbon dioxide-rich (CO2) and hydrogen-rich (H2) gas streams are produced by a) feeding natural gas and water to a reforming reactor, and converted to synthesis gas under supply of an oxygen-containing gas (O2-); b) shifting the gas stream from step a), where the content of carbon monoxide (CO) is reduced and the amounts of CO2 and H2 are increased by reaction of water; and c) separating the gas stream from step b) in a separation unit into a CO2-rich and a H2-rich gas stream, respectively.