摘要
在薄片、扫描电镜、压汞、阴极发光等研究基础上，对姬塬油田西北长8储层砂岩的成岩作用扣储层特征进行了分析研究分析认为原始矿物组成和结构、早成岩期的机械压实作用和化学压溶作用、晚成岩期的铁方解石胶结作用等共同作用导致了研究区长8储层低孔低渗的特征同时，根据17个压汞分析样品11个孔隙结构变量的聚类分析结果．对研究区长8储层进行了分类评价，指出姬塬油田长8储层以低孔低渗的Ⅱ类储层为主，其次为特低孔特低渗的Ⅲ类储层。
On the basis of data researches of thin sections, SEM, mercury intrusion, cathodoluminescence and others, the diagenesis and reservoir characteristics of Chang8 reservoir sandstone in Northwest Jiyuan Oilfield are analyzed. It is considered that the composition and structure of the orig- inal minerals, mechanical compaction and chemical pressure solution in the early diagenetic stage, and ferroan calcite cementation in the late diage- netic stage jointly lead to low porosity and permeability characteristics of the Chang8 reservoirs in the study area. Meanwhile, according to the results of cluster analysis of 11 variables of pore structure from 17 samples of mercury intrusion, Chang8 reservoirs were classified and evaluated in the study area. It is pointed out that Chang8 reservoirs in Jiyuan Oilfield take class Ⅱ reservoirs with low porosity and permeability as the main, and followed by class Ⅲones with extra low porosity and permeability.
关键词
姬塬油田
西北部
成岩作用
储层评价
聚类分析
低孔低渗
Jiyuan Oilfield
northwest： diagenesis
reservoir evaluation
cluster analysis
low porosity and permeability
