Abstract: The upper Sha'er-Dongying formation of Paleogene in Zhanhua sag is in period of fault-depression transform. The comprehensive analysis indicates that the formation could be divided into three long-term cycles and six middle-term cycles, in which nine sedimentary facies are developed such as alluvial fan, river, delta, braided river delta, fan delta, shallow lake, beach bar, semi-deep lake and deep lake and sublacustrine fan. The favorable reservoir sand bodies mainly distribute in C₁, C₂ and C₄ cycles. The distributions of sedimentary systems are influenced by basal settlement, fault activity, provenance and paleoclimate, etc.

Key words: Zhanhua sag, falult-depression transform period, sequence stratigraphy, sedimentary response