Abstract: This paper, based on thin sections of coal-bearing formation of Ordos basin, studies the reservoir features and diagenesis of compact sandstone of coal-bearing formation of southern Ordos basin on cases of Memer 1 of Shanxi formation and Member 8 of Shihezi formation, Sulige area, and concludes that diagenesis largely influences reservoir. In the study area, the rock is mainly debris quartz sandstone with diagenesis of compaction, cementation and dissolution. It is concluded that the members has reached stage B of medium diagenesis combined with regional diagenesis evolution series. Comparison shows reservoir varies with diagenesis that compaction, cementation and dissolution destroy the pore structure in the early diagenesis, leading to a poor reservoir feature, and dissolution starts to produce secondary pores to improve the reservoir in the medium diagenesis.  

Key words: Ordos, diagenesis, compact sandstone, permeability 

摘要： 通过观察鄂尔多斯煤系地层的镜下薄片，以苏里格地区山西组1段与石盒子组8段为例，对盆地南部煤系地层中致密砂岩的储层特征及成岩作用进行研究，结果表明成岩作用对储层特征具有重要影响。研究区主要岩石类型为岩屑石英砂岩，成岩作用类型主要是压实作用、胶结作用、溶蚀作用等，结合区域成岩演化序列，认为研究层段已经进入到中成岩阶段B期。通过对砂岩的储层物性参数进行对比分析，发现不同的成岩作用对储层物性特征有不同的影响作用，压实作用、压溶作用及胶结作用在成岩作用早期破坏了储层孔隙结构，使储集物性变差，进入成岩作用中期之后，溶蚀作用开始产生次生孔隙，储层物性得到改善。 

关键词: 鄂尔多斯；成岩作用；致密砂岩；孔渗性