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The paper analyzed the potential formation reasons of hydraulic fractures based on the formation mechanism and conditions of fractures�� Taken an abnormal high pressure reservoir as example��the formation condition of hydraulic fractures are confirmed through theoretical research and analysis to tectonic evolution history�� The core photos showed there are existed fractures in this oil field which could be classified into three types: re-open fracture��extend fracture and new fracture�� All those fractures could greatly improve the seepage ability of reservoir and form high-yield reservoir��