In view of the complex and various problems in the establishment of sequence stratigraphic framework and the optimization of favorable areas in Lianggaoshan Formation, Sichuan Basin, according to the logging and seismic data of Liangshan Formation, the marker beds of different scales were identified, a logging-seismic identification standard was established for the marker beds, a sequence stratigraphic framework was constructed with regional grid lines, the relationship between lithology and facies zone changes of Lianggaoshan Formation in the whole basin was clarified by the combined analysis of seismic trace and well logging data, and the favorable exploration areas were determined according to the distribution of favorable facies zones and the relationship of "source and reservoir". The study shows that after the water entering horizon was regarded as the marker bed and the sequence stratigraphic framework as established, the development horizon, thickness and distribution range of source rock and reservoir could be quickly determined. Submember 3, Member 1 of Lianggaoshan Formation was regarded as the horizon favorable for source rock development, Submember 1, Member 2 of Lianggaoshan Formation regarded as the horizon favorable for reservoir development, and Submember 3, Member 1 of Lianggaoshan Formation regarded as the source rock development area, namely in the northeast of Sichuan Basin and the edge of Longgang-Liangping Area, with a maximum shale thickness of 60～80 m, which was a favorable target area for further exploration. The results of the study have enriched the sequence stratigraphy, sedimentary evolution and exploration area optimization of Lianggaoshan Formation, Sichuan Basin, and also provided theoretical basis for the exploration and development of similar reservoirs.
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