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通过精细划分对比地层、深入分析层序结构、建立层序地层格架,综合分析了保山盆地的露头剖面、钻井岩芯、测井资料,在羊邑组二~三段内识别出了3类不同级次的层序界面。根据划分出的各层序界面将羊邑组二~三段细分为9个中期、31个短期、66个超短期基准面旋回层序。在此基础上,分析了各级次基准面旋回层序的垂向序列、岩性岩相组合、结构类型及叠加样式等特征,重点讨论了向上“变深”的非对称型和对称型2类超短期基准面旋回层序类型。进一步探讨了高分辨率层序地层学在扇三角洲-湖泊沉积体系的地层划分与对比、地层格架构建中的应用。
Through the detailed division of stratigraphy, in-depth analysis of the sequence structure, the establishment of sequence stratigraphic framework, a comprehensive analysis of the Baoshan prospecting outcrop section, core drilling, well logging data, in the second and third sections of the Yangyi Formation identified three categories Different levels of sequence interface. According to the delineated interface, the second to third sections of Yangyi Formation are subdivided into nine medium-term, 31 short-term and 66 ultra-short-term basement cycle sequences. On this basis, the features of the vertical sequence, lithology and lithofacies assemblage, structure types and superimposed patterns of every level of the basement cycle are analyzed. The asymmetry and symmetry of upward “deepening ” are mainly discussed Type 2 Ultra-Short Reference Cycle Types. The stratigraphic division and contrast of high resolution sequence stratigraphy in fan delta-lacustrine sedimentary system and the application of stratigraphic framework are further discussed.