Abstract: Finely classifying and contrasting strata，analyzing sequence structure and establishing sequence strata framework are the research purpose of this research.By analyzing information of outcrop profile, drilling core and well logging,3 kinds of different sequence interfaces are distinguished in 2nd and 3rd member of YangYi Formation,which can be divided into 9 middle-term,31 short-term and 66 super-short-term base level cyclical sequences.Then,this research analyzes the characteristic of vertical sequence,lithofacies combination,structure type and stacking patterns of various tapered basal level cyclical sequence,and discusses two kinds of super-short-term base level cyclical sequences,which are upward-darken unsymmetrical and symmetric form developed in research interval.Further,the research discusses the application of high-resolution sequence stratigraphy in strata classification and correlation and sequence strata framework establishment in the fan-delta & lacustrine facies depositional systems.

Key words: high-resolution sequence stratigraphy, base-level cycle sequence, stratigraphy correlation, Yangyi formation, Baoshan Basin