Abstract: In order to understand the distribution patterns of oil layers in Xinzhuang oilfield, three types of fault block traps are classified according to the characteristics of the discovered fault blocks. The causes that the oil columns are short and have certain differences in each kind of fault block reservoirs are analyzed in respect of fault sealing. capacities. It is believed that the small probability of juxtaposition of the sandstone and mudstone in the upper and lower fault plates and the poor sealing capacities of faults would have determined the universally short oil columns in each fault blocks, while the differences of sealing capacities between different types of faults would have resulted in the differences of oil columns in each fault block. Some proposals are presented for future exploration and development appraisals.