CO<sub>2</sub>注入砂岩后的典型自生矿物组合

CO₂注入砂岩后的典型自生矿物组合

摘要: CO₂充注将对储集砂岩进行改造,充注早期会引起一些碎屑矿物和早期自生矿物的溶蚀、溶解,形成次生孔隙,并生成某些自生矿物。不同研究区,CO₂注入后的自生矿物组合不尽相同,本文主要研究片钠铝石+高岭石、片钠铝石+铁白云石±菱铁矿、只有片钠铝石和不出现片钠铝石的典型自生矿物组合,对不同的组合进行分析,并讨论其形成原因。

Abstract: CO₂ injection will transform sandstone reservoirs.The early filling will lead to corrosion,dissolution,and formation of some detrital minerals of secondary porosity and also generate some authigenic minerals.For different research areas,the authigenic mineral assemblages are different after CO₂ injection.In this article,there are some typical authigenic mineral assemblages,including dawsonite + kaolinite,dawsonite + dolomite ±siderite,but only dawsonite and non dawsonite are researched.Then,the authors analyze and discuss the origins of different formations.