The Research of Sequence Stratigraphic Framework of Shahejie Formation of Shengtuo Region in Dongying Sag

Based on the basic principle of sequencestratigraphy, startedwith the analysis of seismic stratigraphy,logging cruve, sequence of sedimentary, the paper divided the sequence of shahejie Formation into four sequences and established it's stratigraphic framework from the discussion of sedimentarysystem tracts in the sequences.The sequenceⅠcorresponds to the upper submember of MemberⅣof Shahejie Formation(formingLowstand system tracts,water transgressionsystem tracts and highstand system tracts)is a complete cycle.The sequenceⅡ represents the lower submember of MemberⅢ of Shahejie Formation, characterized by lowstand system tracts undeveloped,only lacustrine transgressionsystem tracts and highstand system tracts developed. The sequenceⅢ represents the mid-submember sedimentation of MemberⅢ of Shahejie Formation and has similar nature ofthesequenceⅡ. SSⅡand SSⅢ are all T-R cyclicsedimentation. The sequence Ⅳdevelops a three-divided system tracts.