Abstract:HJ normal fault is located in the northern part of RY sag in Jizhong depression controlling the eastern boundary of HJ depression.It was interpreted as an "across the board" fault for long time,which slit to the basement till Neogene.After a joint study of seismic time sections and horizontal slices,we have found that HJ is not an "across the board" fault,but is cut into segments by four transverse faults.Combining reservoir distribution characteristics,we consider it as a special reservoir mode,viz.fractured reservoir.Good fractured reservoir develops in the upper part of the Archean granite gneiss,its cap rock is Paleogene mudstone shale section covered on the Archean granite gneiss,and the fault section is oil supply channels.Therefore,with the corresponding source rock,reservoir,cap rock and other conditions,fractured reservoir can become a new oil and gas exploration target.