摘要
利用普通薄片、铸体薄片、X射线衍射、扫捕电镜等资料,分析苏里格气田苏48区块盒8段低渗透储层岩石学特征、成岩作用和孔隙演化过程.研究表明:储集层砂岩类型以岩屑石英砂岩和石英砂岩为主,颗粒分选性中等-好,磨圆度较差,胶结类型以次生加大-孔隙式为主,少量孔隙式胶结.在成岩过程中,强烈的压实作用造成了初始孔隙度的大量丧失,损失率为69.09%,其次为胶结作用,损失率为25.16%.溶蚀作用则形成大量次生孔隙,增加了5.82%的孔隙度,大大改善了储层物性,为该区气藏的聚集提供了主要储集空间.
The characteristics of petrology, the diagenesis and porosity evolution in the eighth member of Shihezi formation in Su 48 block in Sulige gasfield were analyzed, using thin-sections, casting thin-sections, X-ray diffractions, scanning electron micrograph observations, etc. The results showed that both lithic quaxtz- sandstone and quartz sandstone axe the essential components of reservoir sandstones. The sandstone is lithic quartz with middle to perfect sorting and poor psephicity. Cementation is mainly of secondary enlargement-pore and a less proportion of pore cementation. The impact of strong compaction during the early diagenesis was greatest and its porosity loss-rate was 69.09%, and the porosity loss-rate of of cementation was 25.16%. The dissolution of the reservoir sandstone improved the porosity by about 5.82%, which provided the main space for the accumulation of gas reservoirs.
出处
《兰州大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第5期29-34,40,共7页
Journal of Lanzhou University(Natural Sciences)
基金
国家科技支撑计划项目(2007BAB17B02)
国家科技重大专项(2011ZX05044)
关键词
低渗透储层
苏里格气田
苏48区块
成岩作用
孔隙演化
low-permeability reservoir
Sulige gas field
Su 48 block
diagenesis
porosity evolution
