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In this research, thermo-oxidative reactions of crude oils of different origin are determined in limestone matrix using simultaneous thermogravimetry and differential thermal analysis (TG-DTA) systems. Two different reaction regions were identified known as low temperature (LTO) and high temperature oxidation (HTO). Kinetic parameters of the samples were determined by four different methods and the results are discussed. In the combustion of crude oils, two distinct reaction regions were identified known as LTO and HTO, respectively. It was found that the heavy oil exhibits lower burn-out temperatures compared to the medium and light crude oils. It was also observed that the activation energy of crude oils is increased as the API gravity of the crude oil decreased.