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通过各类薄片显微镜下精细研究与定量统计,利用图像孔喉分析、电镜扫描、阴极发光等多种分析测试手段,对鄂尔多斯盆地东部主力含气层盒8段致密砂岩的岩石学特征、孔隙发育特征及成岩作用特征进行研究,结合成岩演化分析其对盒8段各砂岩储层储集性能的影响。研究表明:盒8段砂岩以岩屑石英砂岩和岩屑砂岩为主,其次是石英砂岩,填隙物以高岭石、硅质和伊利石为主,孔隙类型以次生溶孔为主。储层各砂岩的岩石学特征、孔隙发育状况及其成岩演化过程存在一定的差异。差异性的成岩演化过程导致盒8段各砂岩胶结物成分及其含量不同,并导致各砂岩孔隙结构的不同,后者直接影响砂岩的储集性能。该研究对于探讨不同砂岩类型成岩演化对砂岩储层储集性能的影响具有重要的意义,可为研究区天然气的勘探指明方向。
By means of detailed research and quantitative statistics under various thin-slice microscopes, the petrologic characteristics and pore development of tight sandstone in Block 8 of the main gas-bearing formation in the eastern Ordos Basin are analyzed by means of image pore throat analysis, electron microscope scanning and cathodoluminescence analysis. Characteristics and diagenesis characteristics of the sandstone reservoir, and analyze the influence of diagenesis on the reservoir performance of sandstone reservoirs in Box 8. The study shows that box 8 sandstone is dominated by lithic quartz sandstone and lithic sandstone, followed by quartz sandstone, kaolinite, siliceous and illite are main interstitial materials, and secondary pore type is the major pore type. The petrological characteristics, pore development status and diagenetic evolution process of sandstone reservoirs are different. The differential diagenetic evolution leads to different compositions and contents of sandstone cements in box 8, leading to different pore structures of sandstone, which directly affects the reservoir performance of sandstone. The study is of great significance for exploring the influence of diagenesis and evolution of different sandstone types on the reservoir performance of sandstone reservoirs, and can indicate the direction of natural gas exploration in the study area.