In order to deeply analyze the thermal oxidation behavior of crude oil during air injection process in reservoir and further develop air injection enhance oil recovery technology

the TG/DTG-DTA analysis methods were used for study. Based on the classical Arrhenius kinetic model

the effects of oil chemical composition and reservoir rock on the oxidation activity of tested samples were quantitatively characterized. Crude oil undergoes three completely different chemical reactions during the whole heating process: low-temperature oxidation

fuel deposition and high-temperature oxidation. The oxidation of crude oil at low temperature shows a certain endothermic phenomena. Because of different hydrocarbon composition

crude oil with three samples added show different mass loss rates in each reaction area. Compared with that only contains crude oil

the addition of reservoir rocks reduces the activation energy of low temperature and high temperature oxidation. Researches show that: the higher the content of heavier components

the quicker the reaction of crude oil in LTO stage

the more fuel is deposited

and the higher the heat released from the combustion in HTO stage. The activation energy of crude oil in the high temperature stage is greater than that in the low temperature stage. High content of heavy components make the activation energy of oxidation reaction increase. The catalytic properties and specific surface area of reservoir rock reduce the activation energy of crude oil

playing an important role in the heterogeneous catalytic oxidation.