柴西南地区古—新近系砂岩储层成岩作用及其对储层物性的影响

依据普通薄片、铸体薄片、扫描电镜、X—衍射等分析,对柴西南地区古近—新近系砂岩储层的岩石学特征、成岩作用进行了研究,结果表明:该区储集砂体成分主要由长石岩屑砂岩、岩屑长石砂岩和岩屑砂岩组成,主要成岩作用类型有压实作用、胶结作用、溶蚀作用和交代作用,成岩演化阶段已达到中成岩B期;机械压实作用及胶结作用是早成岩阶段原生孔隙遭受破坏的主要成岩作用类型,溶蚀作用是中成岩阶段形成次生孔隙的主要成岩作用类型;受成岩作用及成岩演化阶段的控制,深部储层出现孔隙度、渗透率高异常发育带。

The diagenesis of Paleogene-Neogene sandstone reservoirs and its effects on the physical character of reservoirs in southwestern Qaidam Basin

Based on researches by means of ordinary thin sections,cast thin sections,scanning electron microscope and X-ray diffraction,the authors studied the petrologic and diagenetic characteristics of the Paleogene-Neogene sandstone reservoirs in southwestern Qaidam Basin,and the result shows that sandstone reservoirs in this area are mainly composed of feldspar lithic sandstone,lithic sandstone and lithic arkose and have mainly experienced such actions as compaction,cementation,corrosion and metasomatism,with the...