Laminae are the most typical and representive sedimentary feature in organic-rich shales, and revealing their influences on the reservoir physical properties is vital to understand the oil enrichment mechanisms of lacustrine shale. This study investigated the laminae characteristics and their effects on the physical properties of the shales from the Second Member of the Kongdian Formation (Ek₂). The research presented in this study is based on core and thin section observations, XRD analysis, low-pressure nitrogen physisorption (LNP), high-pressure mercury intrusion porosimetry (MIP), nuclear magnetic resonance (NMR), and scanning electron microscopy (SEM). The results show that the Ek₂ shales developed massive and laminated sedimentary structures. The laminae can be categorized as siliceous laminae, dolomite laminae, clay-rich siliceous laminae, organic matter laminae, and calcite laminae. Analysis of SEM, LNP, MIP, and NMR show that macropores and micro-fractures contribute significantly to the total pore volume of laminated samples, while micropores and mesopores are the dominant pore types in massive samples. The pore structure and connectivity of the laminated samples are better than that of the massive samples. Comparison of laminar and massive mudstones in the Ek₂ showed that the development of laminae physical properties that are more conducive for reservoir formation as a result of interlaminated fractures, optimized arrangement of minerals, and improved organic-inorganic interactions.

纹层是富有机质页岩中最典型、最具代表性的沉积特征，揭示其对储层物性的影响对于理解湖相页岩的富油机制至关重要。本研究调查了孔店组二段（Ek ₂）页岩的纹层特征及其对页岩物性的影响。本研究中提出的研究基于核心和薄片观察、XRD 分析、低压氮物理吸附 (LNP)、高压压汞法 (MIP)、核磁共振 (NMR) 和扫描电子显微镜 (SEM) ）。结果表明，Ek ₂页岩发育块状层状沉积构造。纹层可分为硅质纹层、白云石纹层、富含粘土的硅质纹层、有机质纹层和方解石纹层。SEM、LNP、MIP和NMR分析表明，大孔和微裂缝对层状样品的总孔体积有显着贡献，而微孔和中孔是大块样品中的主要孔隙类型。层压样品的孔结构和连通性优于块状样品。_鄂二段层状与块状泥岩对比表明，由于夹层裂缝、优化的矿物排列和改善的有机-无机相互作用，纹层物理性质的发展更有利于储层的形成。