Abstract: With further exploration and development of oil fields, the reservoirs with low amplitude structure are paid more attention to. Two origins and multi-identifications for such reservoirs are discussed and presented, integrated with studied area conditions. The identification methods include the coherent data volume processing technique with predominant frequency band to distinguish from small faults, the plane slice technique, auto-tracing technique, the spilling point restriction technique, the variable velocity mapping technique and the flow chart for studying the low amplitude structures. Application of these techniques to Neogene reservoir in Gaoliu structural zone of Nanpu sag, Ten low amplitude structures have been found, three of which been drilled, obtaining commercial oil flows. Also, two low-amplitude-structure reservoirs at C₅ unit (Es₂) in Chunhua field of Dongying sag have been found, and five wells been drilled with good responses.

Key words: low amplitude structure, origin, method, exploration