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With the decrease of conventional oil production, the role of heavy hydrocarbons in the world energy balance will continue to increase in the near future. Heavy oil and natural bitumen as two of the alternative sources are perhaps the most readily available to meet short- and long-term needs. Intrastratal oxidation requires a formation temperature in the range of 250-350пїЅC, at which it is possible to achieve an in-situ oil upgrading through the low-temperature oxidation reactions of petroleum hydrocarbons. Usual...