摘要
全面获取储层中地层微粒和粘土矿物的分布信息是进行沉积学研究、有效油层开发和储层保护的必要条件。Ｓ７２－４储层为将进行化学驱强化采油的松散砂砾岩储层，地层微粒和粘土矿物含量多。利用Ｓｔｏｋｅｓ原理对获得的储层岩样进行了四级粒度分离，并对各粒级范围提取物进行了粘土矿物相对含量分析，确定了各粒级范围地层微粒的含量、粘土矿物的相对含量、以及二者间的关系。结果表明在小于１６μｍ的地层微粒中＜２μｍ的地层微粒含量最多，占样品总重的９．９９％～２０．６２％；其次为４μｍ～８μｍ和８μｍ～１６μｍ粒径范围的地层微粒，占４．９３％～１０．０７％；２μｍ～４μｍ的微粒含量最少。粘土矿物含量分析表明高岭石的含量最高，其次为蒙脱石，绿泥石的含量最少。并且粘土矿物主要分布于＜２μｍ的粒径范围。在油层保护中必须防止高岭石的微粒运移和蒙脱石的水化膨胀。
It is necessary to obtain distribution information on formation fines and clay minerals for sedimentology research,effective oil exploitation and reservoir protection.S 7 2-4 formation consists of loose gravels,sands and lots of fines and clay minerals.Formation fines of four grade scales were extracted and clay minerals were analyzed.Results show that the content of fines with grain size less than 2 μm is the highest and makes up 9.99%￣20.62% of the entire fines.The amount of fines with size of 4 μm￣8 μm and 8 μm￣16 μm comes second and acounts for 4.93%￣10.07% and the amount of the fines with size of 2 μm￣4 μm is the least.The analysis of clay minerals indicates that the content of kaolinite is the highest,then montmorillonite and chlorite are the last.Clay minerals mainly distribute in the grade scale less than 2 μm.It implies that more attention should be paid to the stablization of fines with the size less than 2 μm.
出处
《矿物岩石》
CAS
CSCD
北大核心
1999年第2期41-46,共6页
Mineralogy and Petrology
基金
"九.五"国家项目
