摘要
鄂尔多斯盆地米脂地区上古生界盒8~上储层岩石类型主要为岩屑砂岩,少量为岩屑质石英砂岩和石英砂岩,个别为长石质岩屑砂岩。沉积相属于辫状河三角洲前缘沉积,砂岩平均孔隙度为5.85%,平均渗透率为0.54×10^(-3)μm^2,属低孔低渗透储层。综合运用薄片鉴定、扫描电镜、压汞和包裹体测温等手段对成岩作用类型及其对储层物性的影响进行了研究,判别出了成岩阶段及成岩序列。研究区储层为晚成岩B期,成岩作用类型包括压实作用、胶结作用、交代作用和溶蚀作用,机械压实作用、化学压溶作用和自生矿物的胶结作用是造成储层低孔低渗透的主要原因,成岩晚期的溶蚀作用大大改善了储层物性。
The standstone reservoir in the Neopaleozoic upper He8 of Mizhi area is lithic sandstone dominantly with minor syrosem quartz sandstone, quartz sandstone and certain itharenite.Sedimentary facies of the research region is braid river delta front,and average porosity of sandstone 5.85%,mean permeability 0.54μm^2.It belongs to low-porosity and low-permeability reservoir.Through comprehensive application of thin section analysis,SEM,mercury-injection method and inclusion thermometry,the diagenesis types and their influence on the reservoir physical properties,diagenetic phase and the succession of diagenesis were researched.The reservoir is now in the late diagenetic phase B and has already been experienced compaction,cementation,metasomatic alteration,recrystallization and denudation.The mechanical compaction, chemical pressure solution,authigenic mineral cementation are the main reason of the poor poroperm characteristics,and denudation in the late diagenetic phase greatly improved the reservoir physical properties.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2009年第4期47-49,52,共4页
Petroleum Geology and Recovery Efficiency
基金
国家重点基础研究发展规划"973"基金资助项目"多种能源矿产共存成藏(矿)机理与富集分布规律"(2003CB214606)
