The directions of fractures in Hanan Olifield are determined by paleomagnetic method.121 micro-fracture slices are identified to analyze the relationship between micro-and macro-fractures.The tracer experiment of a well group is done to detect the water transmission fractures and faults.Based on the data of seism

drilling interpetation in faults and the performance data

a conclusion is drawn that in the fault system of Aershan Reservoir

NE strike faults and NW strike fractures are conjugated.The transmissibility of the fault system is so serious that the inflow rate in fault-developed areas is 40-100 m/d.The effects of tansmissibility resulted in the confusion of the injection-production layers

thus forming injection-production in different layers.On the same time

some production wells are of high pressure and flooded.According to the characteristics of the fault system

corresponding contermeasure is put forward.