Abstract：The accumulations and distributions of oil and gas in fault-block oil field are greatly controlled by various faults. Such oil, field is characterized by complicated structure, multiple reservoirs, complex contact between oil and water, and big oil abundance difference among the reservoirs. The properties bring many troubles to the exploration and development of such oil and gas fields. There is no uniform statistical calculation standard that is special for multitudinous fault block traps. Common trap factor calculation methods are suitable for anticlinal trap, but they are not applicable to complicated fault block traps. A new factor calculation method for fault traps in which there are quite thick reservoir and overlying formation is presented on the basis of fault trap property and interrelations among the factors which influence trap characteristics. Quite accurate closing areas of oil traps have been obtained by using the method in Dongpu seg.
