安塞油田坪桥地区塞5、塞431区长2储层特征与成岩作用

通过常规物性、岩石及铸体薄片、重矿物、X射线衍射、扫描电镜等多项测试方法,分析鄂尔多斯盆地安塞油田坪桥地区塞5、塞431区长2储层的岩石学特征和成岩作用。该储集层砂岩类型主要为长石砂岩,岩屑质长石砂岩次之。区内成岩作用包括机械压实作用、石英及长石的次生加大、碳酸盐胶结作用等,其中压实作用是造成本区砂岩原生孔隙大量丧失的主要原因,溶蚀作用在一定程度上使储层物性得到改善。

Chang2 Reservoir Characteristics and Diagenesis of Sai5, Sai431 Region in Pingqiao Area,Ansai Oilfield

The petrologic characteristics,diagenesis in Chang2 reservoir of Pingqiao area,Ansai oilfield are studied by varied methods,including examination of the normal physical properties,thin-section and casting thin-section,heavy minerals,X-ray diffraction,SEM analysis and so on.The reservoir-rock types in Chang2 reservoir are mainly arkose,secondly lithic arkose sandstone.Diagenesis includes compaction,enlargement of quartz and feldspar,cementation of carbonate mineral,etc.It is the compaction that reduces the p...