Abstract: By PDSC and TG/DSC，the reactivity of crude oil of light oil reservoir in Shanshan Oilfield with air is investigated with the influences of rock mineral composition，temperature and pressure and so on.Temperature increase and heat liberation caused by oxidation are also researched.The results show that for Shanshan light oil reservoir，when temperature is lower than 300℃，oil has strong reaction capability with oxygen，and a large of heat is released.At the same time，oxidation reaction rate can be increased sharply by increasing pressure.And in low temperature range，heat liberation of oxidation increases，heat flow curve is steep.When pressure reaches 4136kPa，oil shows violent exothermal reaction at 215～220℃，and burning or explosion reactions in gas phase take place with large heat liberation.The oxidation reaction of oil becomes stronger with the increase of surface area.Because of the catalytic action of microelement which may exist in formation rocks，the oxidation reaction of oil is enhanced.In low temperature range，Shanshan oil has strong volatility，and the oil oxidation reaction in gas phase is not shown.Because of high API of oil，TG/DSC results at low pressure can not show the trend of oil oxidation reaction completely，TG/DSC or PDSC at high pressure and ARC test are very important.

Key words: Shanshan oil, air injection, reactivity, PDSC, TG/DSC