Sedimentary Facies Analysis and Stratigraphic Sequence Division of the Second Member of the Yingcheng Formation in the Southeastern Uplift Region,Songliao Basin

Based on geologic reconnaissance for Jiutai of Jilin Province and using the theories and methods of sequence stratigraphy,the 2nd Member of the Cretaceous Yingcheng Formation(K1y2) was detai1ly divided according to their lithology,lithofacies and internal configurations.The thick conglo-merate of the K1y2 field outcrops belong mainly to braided channel sediments and were formed by vertical cutting and piling,and can be divided into three-stage base-level cycle sequences(one long-term,three middle-term and eight short-term base-level cycles).