Abstract: The basic definitions of commereial reserve and cormnercial oil Alow and their estirnating methous have akwavs been a problem to academic cireles of petroleum at home and abroad. This paper proposed relatively practical and basic definitions aboul these by investigation and study of such a information available in th: world. The proposition anld estabhishnnent of estirnating cummercial reservc tool was based 011 generally arcepted present value approach. whereas that of estinating commercial oil flow onl Junggar basins ecomonic evaluation resulls performed for over ten years. esprcially un lts econourice limit given bv studv in recent years. These methods are indlicated to be simple and practical for us And spreading out dndl application of them to all oilfields of domestic petroleunl industr will be of significance.

Key words: Petroleun Industry. Cornmereial Reservoir, Crude oil reserve, Production, Economic evaluation, Caleulation mnethod