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为弄清鄂尔多斯盆地延长组砂岩储层孔隙度与富铁绿泥石胶结的关系,运用铸体薄片、扫描电镜、电子探针等技术分析了砂岩的孔隙特征、岩石组分特征及孔隙与岩石组分的关系,认为绿泥石包膜对孔隙的保护作用有限,火山物质(火山灰杂基和火山岩岩屑)的碱性溶蚀是孔隙发育的主要原因,通过定量计算绿泥石的铁质来源,认为这种火山物质属于中-基性火山岩,在早成岩阶段A期7%～11%的中基性火山物质发生碱性溶蚀,产生了8%的碱性溶蚀粒间孔隙,同时生成了3%的孔隙衬里绿泥石.绿泥石胶结物的广泛分布只是指示成岩早期发生了大量的火山物质溶蚀并产生了可观的碱性溶蚀孔.
In order to understand the relationship between sandstone reservoir porosity and iron-rich chlorite cementation in the Yanchang Formation in the Ordos Basin, the pore characteristics, composition of rock components and the relationship between porosity and rock are analyzed by means of casting thin slices, scanning electron microscopy and electron probe. Composition of the relationship that the protective effect of the chlorite envelope on the pores is limited, alkaline erosion of volcanic material (volcanic ash and volcanic rock debris) is the main reason for pore development by quantitative calculation of the chlorite source of iron This volcanic material is considered as a medium-basic volcanic rock. During the early diagenetic stage A, 7% ~ 11% of the alkaline volcanic material undergoes alkaline dissolution, resulting in 8% of alkaline dissolution intergranular pores and simultaneous formation of 3% of the pore-lined chlorite. The widespread distribution of chlorite cements only indicates that a large amount of volcanic erosion occurred early in diagenesis and resulted in considerable alkaline dissolution pores.