准噶尔盆地北三台凸起二叠系梧桐沟组一段碎屑岩储层特征及控制因素

Clasolite reservoir characteristics and controlling factors of the 1^(st) member of Permain Wutonggou Formation in Beisantai Uplift,Junggar Basin

通过岩石铸体薄片鉴定、扫描电镜和X-射线衍射等技术手段,研究了准噶尔盆地北三台凸起二叠系梧桐沟组一段碎屑岩储层的特征,分析了储层物性的控制因素。结果表明:北三台凸起二叠系梧桐沟组一段储层以岩屑砂岩为主,碎屑成分主要为火成岩岩屑,具有低成分成熟度、较低结构成熟度等特征;储层类型为中孔低渗型,主要发育粒间溶孔,孔隙大小中等,喉道偏细。沉积相是影响研究区内储层物性的基本因素,控制着储层物性的横向展布;压实作用是研究区内对储层物性破坏性最强的成岩作用,是使储层物性损失的主要因素;胶结作用是使储层物性损失的次要因素;溶蚀作用是研究区内主要的建设性成岩作用,是影响北三台凸起梧桐沟组一段碎屑岩储层物性的主要因素。

Based on casting observation,SEM and X-ray diffraction,this paper studies the clastic reservoir characteristics of the 1st member of Wutonggou Formation,Beisantai Uplift,Junggar Basin and analyzes the controlling factors of the reservoir physical properties.The research shows that the sandstone reservoir of the 1st member of Wutonggou Formation mainly consists of volcanic rock debris with low compositional maturity and textural maturity.The reservoir was characterized by medium porosity,low permeability,medium pore volume and fine throat.The sedimentary facies is the main controlling factor in the study area,controls the transverse distribution of the reservoir physical properties.Compaction is the most important destructive diagenesis as well as the main factor that makes the reservoir physical properties worse.Cementation is the secondary factors that make the reservoirs physical properties worse.Dissolution is the main constructive factor that influences the reservoir physical properties in the study area.