扫描电镜（ＳＥＭ）观察分析是研究储集砂岩成分和成岩作用的重要手段．通过对临盘油田盘二断块沙三下储层的电镜观察分析发现，该套储层埋藏较浅，机械压实作用较弱，原生粒间孔隙较发育．研究还表明，砂岩的胶结物以粘土矿物为主，其中主要是自生高岭石和伊／蒙混层矿物，胶结疏松，具有较好的储集性，但又易出砂．因此，在进行油田开发方案调整时，应充分考虑这些因素． Scanning electron microscopy (SEM) observation and analysis are important means to study the composition and diagenesis of reservoir sandstone. Based on the electron microscope observation of the reservoir in the second member of the Pan-2 fault block in Linpan Oilfield, it is found that the reservoir is shallow buried with weak mechanical compaction and more developed intergranular pores. The study also shows that sandstone cements are mainly composed of clay minerals, mainly of kaolinite and Iraqi / mixed layer of mineral, loose cementing, good reservoir, but easy sand production. Therefore, in the adjustment of oilfield development programs, these factors should be fully considered.