The Chang 7₃ sub-member of Triassic Yanchang Formation in the Ordos Basin was taken as an example and the lamina types and combinations, reservoir space features and shale oil enrichment patterns in organic-rich shale strata were investigated using core observation, thin section analysis, XRF element measurement, XRD analysis, SEM, high solution laser Raman spectroscopy analysis, and micro-FTIR spectroscopy analysis, etc. According to the mineral composition and thickness of the laminae, the Chang 7₃ organic-rich shales have four major types of laminae, tuff-rich lamina, organic-rich lamina, silt-grade feldspar-quartz lamina and clay lamina. They have two kinds of shale oil-bearing layers, “organic-rich lamina + silt-grade feldspar-quartz lamina” and “organic-rich lamina + tuff-rich lamina” layers. In the “organic-rich + silt-grade feldspar-quartz” laminae combination shale strata, oil was characterized by relative high maturation, and always filled in K-feldspar dissolution pores in the silt-grade feldspar-quartz laminae, forming oil generation, migration and accumulation process between laminae inside the organic shales. In the “organic-rich + tuff-rich lamina” binary laminae combination shale strata, however, the reservoir properties were poor in organic-rich shales, the oil maturation was relatively lower, and mainly accumulated in the intergranular pores of interbedded thin-layered sandstones. The oil generation, migration and accumulation mainly occurred between organic-rich shales and interbedded thin-layered sandstones.

以鄂尔多斯盆地三叠系延长组长7 ₃亚段为例，通过岩心观察，薄层分析研究了富含有机质页岩地层的类型，组合，储集空间特征和页岩油富集规律。 ，XRF元素测量，XRD分析，SEM，高解激光拉曼光谱分析和显微FTIR光谱分析等。根据薄片的矿物成分和厚度，Chang 7 ₃富含有机物的页岩有四种主要类型的薄片：富含凝灰岩的薄片，富含有机物的薄片，粉砂级长石-石英薄片和粘土薄片。它们有两种页岩含油层，即“富含有机物的薄片+粉砂级长石-石英薄片”和“富含有机物的薄片+含凝灰岩的薄片”层。在“富含有机质+粉砂岩级长石-石英”层状页岩地层中，石油具有较高的成熟度，并且始终充满在粉砂级长石-石英层中的钾长石溶解孔中，形成了石油，有机页岩内部薄片之间的迁移和积累过程。在“富含有机质+凝灰岩的薄层”二元层状组合页岩地层中，富含有机质的页岩储层性质较差，油成熟度相对较低，且主要堆积在层间薄层砂岩的粒间孔中。石油的产生，运移和聚集主要发生在富含有机质的页岩和夹层薄层砂岩之间。