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In the middle and second half of oilfield development, further exploration and development of petroleum reservoirs in complex fault blocks are major tasks. Based on the characteristics of fully developed farewell faults in the Wenweigu oil field and the data from 3D earthquakes, RFT, HDT and other techniques, farewell faults and their distribution were identified. Conformation of the fault blocks has been provided and the precision of describing the farewell faults improved. Research technology of farewell faults has applied these methods in this region.