【摘要】 针对准噶尔盆地玛湖凹陷风城组陆相页岩成分复杂、沉积构造多变的特点,结合宏观岩心描述、微观镜下观测、XRD矿物衍射与高压压汞实验,提出基于"矿物组成+沉积构造"的陆相页岩岩相划分方案。结果表明,风城组主要发育纹层状长英质页岩、块状含云长英质页岩、纹层状含长英云质页岩以及纹层状含黏土长英质页岩4种典型岩相类型。不同岩相的沉积构造特征差异显著,长英质页岩多发育长英质条带、团块,含云长英质页岩、含长英云质页岩常见不规则云化。风城组页岩主要发育粒间孔、粒内溶孔,有机质孔发育较少,孔体积主要由10～100 nm孔径贡献。纹层状长英质页岩孔体积、孔隙连通性和储集物性最好,是风城组页岩油储集最有利的岩相。更多还原

【Abstract】 In view of the complex composition and variable sedimentary structure of the continental shale of the Fengcheng Formation in the Mahu Sag, Junggar Basin, combined with macro core description, microscopic observation, XRD mineral diffraction and high-pressure mercury intrusion experiments, it was proposed based on "mineral composition + sedimentary structure" division scheme of terrestrial shale facies.The results showed that the Fengcheng Formation mainly developed 4 types of laminar felsic shale, massive dolomite-bearing felsic shale, laminar felsic-bearing dolomitic shale, and laminar clay-bearing felsic shale.The sedimentary structure characteristics of different lithofacies were significantly different.Felsic shale mostly develops felsic bands and blocks, and irregular cloudification was common in felsic shale and felsic shale.The shale of the Fengcheng Formation mainly developed intergranular pores and intragranular dissolved pores, and there were few organic pores.The pore volume was mainly contributed by the pore size of 10～100 nm.Laminar felsic shale had the best pore volume pore connectivity and reservoir properties, and was the most favorable lithofacies for Fengcheng Formation shale oil storage.更多还原