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碳酸盐胶结作用是辽河盆地下第三系沙河街组砂岩中最常见的胶结作用之一，碳酸盐胶结物含量变化大、分布范围广。本文运用扫描电镜、阴极发光、氧碳同位素等方法，对研究区砂岩储层中碳酸盐胶结物的发育状况、形成机制进行了分析，认为有机质演化过程中产生的有机酸、ＣＯ２改变了砂岩的成岩地球化学环境，既为碳酸盐胶结物的溶解创造了条件，又为其沉淀提供了物质来源，从而对砂岩储层孔隙的发育、演化产生重要影响。
Carbonate cementation is one of the most common cements in the sandstones of the Shahejie Formation in the Lower Tertiary of the Liaohe Basin. The carbonate cements vary widely in content and have a wide distribution. In this paper, the development and formation mechanism of carbonate cement in the sandstone reservoirs in the study area are analyzed by using scanning electron microscopy, cathodoluminescence and oxygen-carbon isotope analysis. It is concluded that the organic acids and CO2 produced during the evolution of organic matter change sandstone The diagenetic geochemical environment not only creates the conditions for the dissolution of carbonate cement, but also provides the material source for its precipitation, which has an important influence on the development and evolution of the pore of sandstone reservoir.