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In-situ combustion process has been proven to be an effective enhanced oil recovery (EOR) method for heavy oils. However, until now, the in-situ combustion is still not widely used as steam injection is. The main reason that limits the wide application of in-situ combustion process is the unclear understanding of its complicated combustion and displacement process that is mainly controlled by the oxidation of crude oil. The complicated composition of crude oil makes it difficult to understand the oxidation mechani...