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Study on sedimentary facies characteristics of Xujiahe Formation in Sichuan Basin

机译：四川盆地徐家河组沉积相特征研究

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Sedimentary facies is the summation of all primary sedimentary features in a sedimentary unit, which is the product of sedimentation in a specific environment. It emphasizes the material performance of sediment formation conditions, including mineralogy, petrology, paleontology, geochemistry and geophysics. Therefore, it has unique sedimentary features in this environment. In this paper, the types and units of sedimentary facies which can reflect the basic characteristics and geometry of sedimentary system are established, and based on the comprehensive analysis of rock types, lithological assemblages, sedimentary structures, palaeontological assemblages and section structures, the sedimentary facies types of Xujiahe formation of Upper Triassic in the study area mainly include semi-arid flooded basin facies, delta facies, beach bar-lagoon system and lake facies, among which delta facies and beach bar-lagoon system are the main sedimentary facies types. Because sedimentary facies is the historical product of basin formation, evolution and extinction, it can not only reflect the formation conditions, temporal and spatial distribution and evolution law of related strata and rock types, but also be the basis for analyzing the nature and structural background of sedimentary basin. At the same time, the analysis of sedimentary facies is of great significance for understanding and analyzing the evolution history of basin and guiding the exploration and development of related oil and gas resources.
机译：沉积相是沉积单位中所有初级沉积特征的总结，这是特定环境中沉淀的产物。它强调沉积物形成条件的材料性能，包括矿物学，岩石学，古生物学，地球化学和地球物理。因此，它在这种环境中具有独特的沉积特征。在本文中，建立了沉积体系基本特征和几何形状的沉积相类型和单位，并基于岩型，岩性组合，沉积结构，古生物组合和段结构的综合分析，沉积相研究领域的徐家海形成的类型主要包括半干旱淹水盆地，三角面，海滩酒吧 - 泻湖系统和湖面，其中三角面和海滩酒吧 - 泻湖系统是主要的沉积相类型。由于沉积相是盆地形成，进化和灭绝的历史产品，因此它不仅反映了相关地层和岩石类型的地层条件，时间和空间分布和演化法，而且是分析性质和结构背景的基础沉积盆地。与此同时，对沉积相的分析具有重要意义，对盆地的演化史以及指导相关石油和天然气资源的勘探和发展。

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