中文摘要：

绿泥石环边是碎屑岩地层中一种常见的现象,其产出状态与含量对储层储集物性有重要的控制作用。以鄂尔多斯盆地南部延长组为研究对象,通过铸体薄片、扫描电镜、背散射及能谱,对绿泥石的产出状态、形成机理、形成时间及对孔隙的保存机理进行深入研究,结果表明：（1）微咸水-半咸水的湖泊三角洲前缘沉积亚相、富黑云母的长石砂岩与绿泥石存在空间上的耦合;（2）绿泥石的形成时间不早于初始压实阶段,不晚于自生石英的出现;（3）绿泥石环边对自生石英的抑制主要是通过改变孔隙微区环境及占据颗粒表面空间,进而阻止自生石英在碎屑石英表面成核来完成的;（4）绿泥石环边中的晶间孔对延长组油藏来说,意义可能不大,但为以后酸性水的渗流提供了部分通道;（5）绿泥石环边对储层建设性的成岩作用主要表现为减缓了上覆地层的机械压实和对自生石英起到了一定的抑制。

英文摘要：

The chlorite rims are frequently observed in clastic successions.Their content and occurrence may heavily influence the reservoir properties.By using thin section determination and SEM,BSE,EDX analyses,we studied occurrence,timing,mechanism of generation and contribution to porosity preservation for the samples from Yanchang Formation,South Ordos basin.The results show：（1）There exists a spatial coupling of chlorite development with the brackish water delta front facies depositional environment and the biotite-rich arkosic sandstone;（2）The formation timing of chlorite is not earlier than the initial compaction stage,but not later than the appearance of authigenic quartz;（3）Formation of chlorite rims could change the porosity microenvironment and prevent growth of authigenic quartz on the detrital quartz surface;（4）The intercrystalline pores in chlorite rims are of limited value for petroleum storage,but can somehow contribute to the reservoirs as pathways for acidic fluids circulation;（5）The constructive diagenetic role of chlorite rims is their weakening effect for the overburden stress and restricting effect for the autigenic quartz growth in certain degree.