中文摘要：

湖相页岩中的纹层发育段具有相对较好的储集性能,纹层的发育程度可能对陆相页岩气产能具有重要影响。文章通过偏光显微镜、扫面电镜和微区矿物定量分析等可重复性实验手段,对鄂尔多斯盆地延长组页岩纹层段岩石进行了研究。研究表明：延长组页岩纹层为机械沉积作用成因,在偏光镜下暗层与亮层相间分布;暗层主要成分是石英和黏土矿物,亮层主要成分是石英、长石等碎屑矿物;亮层碎屑颗粒边缘溶蚀,在颗粒间形成了晶体形态特征明显的黏土矿物,石英颗粒较大。亮层孔隙多分布在碎屑颗粒边缘,孔隙少,但连通性好;暗层中的黏土矿物没有很好的晶体形态,石英颗粒细小,暗层孔隙多分布在黏土矿物颗粒之间,分布密集,但连通性差。

英文摘要：

Shale with lamina has better reservoir performance,and the lamina may have great effect on shale gas productivity. This study deals with the lamina in shale from Yanchang Formation of Ordos Basin using a combination of meticulous, precise, repeatable laboratory preparation and measurement techniques. The experiments involved are polarizing microscope, scanning electron microscope and QEMSCAN. The experi- ments show that the lamina in shale from Yanchang Formation is of mechanical origin. The light lamina is mainly composed of detrital minerals. The clay minerals scattered among detrital minerals have better crystal growth morphology. The rim of detrital minerals is dissolved. Dark lamina is mainly composed of clay minerals without good crystal growth morphology. The size of quartz is smaller, compared with quartz in light lamina. Pores widely distributed in clay minerals are rarely connected.