SUB FAULTS IN COMPLEX FAULT-BLOCK OIL-FIELD AND ITS RELATION TO THE ACCUMULATION OF OIL AND GAS

Based on the analysis of the regional structure,this paper mainly focus on the discuss of the distribution,characteristics,and process of the formation of the sub-fault around major fault and its controlling to the accumulation of oil and gas in complex fault-block oil-field,Taking the Xianhezhuang Oil-Field in the central syncline belts in Dongying depression as an example.The result suggests that the sub faults in the conjugated-area of explored blocks and its edges,which control the new-prospected oil bearing block, plays an important role in the reservoir increment of the old oil-explored field.