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The depletion of light hydrocarbon resources and increasing the amount of heavy oil reservoirs drive petroleum companies to produce high viscous oil by unconventional methods, particularly thermal methods. Presently increasing the efficiency of thermal applications is a vital task. This paper discusses the influences of catalytic (introduction of catalytic precursors and H donor with amount of 1 wt% on oil) and non-catalytic aquathermolysis to the group composition and properties of extra-heavy oil from ?Ashalchin...