Abstract Based on field geological surveys of two deep-water sedimentary outcrops in the Yanchang formation of the Ordos Basin, X-ray diffraction analysis, elemental geochemical analysis, and polarizing microscope observations were conducted to investigate the causes of various sedimentary structures inside the massive sand bodies from deep-water debris flow. A genesis model of deep-water debris-flow sandstone is established: during the handling of the mass transport complexes in the basin slope, the soft sandy sedimentary layer with relatively strong shear resistance tears the soft muddy sedimentary layer with weak shear resistance and pulls various clumps inside the muddy layer. Finally, debris-flow massive sandstones with rich sedimentary structures are formed. Through argon ion polishing and field emission scanning electron microscopy, the debris-flow sandstones mainly develop micron-scale pores, and the pore radius is mainly distributed in the range of 1–8 µm. The sedimentary rocks from the semi-deep lake to deep lake facies only have a small number of nano-scale pores, and the pore radius is distributed between 20 and 120 nm. Graphical Abstract

中文翻译：

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陆相湖盆深水块状砂岩成因机制及其在微纳储集层体系中的意义——以鄂尔多斯盆地延长组为例

摘要 以鄂尔多斯盆地延长组两处深水沉积露头野外地质调查为基础，通过X射线衍射分析、元素地球化学分析和偏光显微镜观测，研究了块状砂岩内部各种沉积构造成因。来自深水泥石流的尸体。建立了深水泥石流砂岩成因模型：在盆地斜坡内的传质复合体处理过程中，抗剪力较强的软质砂质沉积层撕裂抗剪力较弱的软质泥质沉积层，拉动各种在泥泞层内结块。最后形成沉积构造丰富的碎屑流块状砂岩。通过氩离子抛光和场发射扫描电镜，碎屑流砂岩主要发育微米级孔隙，孔隙半径主要分布在1～8 µm范围内。从半深湖相到深湖相的沉积岩只有少量纳米级孔隙，孔隙半径分布在20～120 nm之间。图形概要