南八仙油田下油砂山组砂岩成岩作用及孔隙演化  

Diagenesis and Porosity Evolution of Pleiocene Xiayoushashan Formation Sandstone in Nanbaxian Oilfield

作　　者：李建明[1] 严钰童[1] 吴银萍[1] 

机构地区：[1]长江大学地球科学学院,湖北武汉430100

出　　处：《长江大学学报（自科版）（中旬）》2013年第5期1-4,共4页Journal of Yangtze University(Nature Science Edition)

摘　　要：对柴达木盆地南八仙油田上新统下油砂山组(N12)储层砂岩成岩作用及孔隙演化进行了研究。研究发现,N12储层主要为一套辫状河三角洲和滨浅湖砂岩,储集岩主要为长石岩屑砂岩、岩屑砂岩和岩屑长石砂岩,经历了压实压溶、胶结、交代、溶蚀等多种成岩作用,其中压实压溶、胶结作用起主要的破坏作用,溶蚀作用起主要的建设性作用。目前N12储层砂岩达到早成岩B期向中成岩A期过渡阶段。储层砂岩经成岩演化其原生孔隙近一半被破坏,次生孔隙开始大量出现,但还是以原生孔隙为主要储集空间,孔隙演化经历了原生孔隙的破坏、次生孔隙的形成2个阶段。Pleiocene Xiayoushashan Formation sandstone is a set of braided river deltaic sediments and shore-low lake sediments,which are comprised of feldspar lithic sandstone,lithic sandstones and lithic quartz sandstones.The sandstones experience compaction,pressolution,cementation,metasomasis and corrosion during the diagenesis,and now it is in the transition of early diagenesis Stage B to middle diagenesis Stage A.Compaction and cementation are constructive to the reservoir,but cementation is ruinous to the reservoir.Nearly a half of primary pores are destructed after the diagenetic evolution,and the secondary pores are abundant.Whereas,primary pores are mainly of reservoir volume.Rock porosity evolution has experienced two stages,one is the destruction of primary pores and the other is the construction of secondary pores.

关 键 词：成岩作用 孔隙演化 次生孔隙 下油砂山组 柴达木盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]