【摘要】 从储层演化的角度来说,高岭石是砂岩储层中最常见的自生黏土矿物之一,储层中的自生高岭石是酸性流体与长石等铝硅酸盐矿物反应的结果。本文通过薄片鉴定分析高岭石镜下特征,研究文献得出形成高岭石的酸性流体主要包括下渗的富CO2大气水,地层温度超过120℃后,孔隙流体逐渐转变为碱性,高岭石向伊利石转化。进入中晚成岩阶段,在偏碱性的环境下,高岭石就会向绿泥石转化。自生高岭石含量与储层物性之间具有较好的相关性,成岩场中,高岭石的迁移与沉淀对储层产生了不同的影响。自生高岭石含量较高,具有更好的成岩和次生孔隙形成条件,而且,油气侵位产生的惰性环境,往往有利于高岭石的保存。更多还原

【Abstract】 From the point of view of reservoir evolution, kaolinite is one of the most common authigenic clay minerals in sandstone reservoirs, the authigenic kaolinite is the product from the reaction between acidic fluid in the reservoir with aluminum silicate minerals. In this article, microscopic characteristics of authigenic kaolinite were analyzed by thin section identification. Through looking up the literatures, it’s pointed out that the acidic fluid for forming authigenic kaolinite was mainly atmospheric water with rich CO2. When formation temperature was over 120 ℃, pore fluid gradually transformed into alkalinity, montmorillonite transformed to illite. In the middle diagenetic stage, under an alkaline environment, kaolinite transformed to chlorite. Authigenic kaolinite content has a good correlation with reservoir physical property, the migration and precipitation of kaolinite have different influence to the reservoir. The higher the authigenic kaolinite content, the better the diagenesis and secondary pore forming conditions. Moreover, hydrocarbon emplacement of inert environment is conducive to the preservation of kaolinite.更多还原