高邮凹陷北斜坡阜宁组储层成岩作用特征

Diagenetic characteristics of Funing Formation reservoir in northern slope
of Gaoyou Depression

宋秋花1  宋全友 陈刚强 李宝刚 郑艳梅

胜利油田分公司胜利采油厂，山东 东营 257041 中国石油大学地球资源与信息学院，山东 东营 257061

高邮凹陷北斜坡储层岩性以细砂岩和粉砂岩为主，砂岩类型主要为岩屑-长石质砂岩。该区23口井岩心砂岩储层铸体薄片及普通薄片的分析结果表明：成岩作用类型主要有压实作用、胶结作用、交代作用和溶解作用，岩石在埋藏过程中以机械压实作用为主，胶结物主要有碳酸盐岩胶结物和硅质胶结物，交代作用很普遍，杂基与胶结物的溶解对次生孔隙的形成起重要作用，改善了储集性能。根据镜质体反射率和伊蒙混层的成岩界限等，证实研究区储层基本上处于晚成岩A1亚期和晚成岩A2亚期。

The reservoir lithology is mainly fine sandstone and siltstone in Funing Formation of northern slope袁Gaoyou Depression. Sandstone types are mainly debris-feldspathic sandstone. Based on the analysis of casting thin section and common thin section from the cores of 23 wells in study area,the diagenetic types typically comprise the compaction,cementation,metasomatism and dissolution. The mechanical compaction is dominant in the process of burial. Cements are mainly the carbonate cements and siliceous cements. The metasomatism is very common. The dissolution of complex base and cement plays a major role for the
development of secondary porosity,which improves the reservoir property. According to the vitrinite reflectance data and the lithogenic limit of illite-smectite mixed layer,the reservoirs in the study area are mainly in A1 substage of late diagenesis stage and A2 substage of late diagenesis stage.