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采用有机岩石学分析方法，研究了西湖凹陷下第三系煤系源岩（煤和泥岩）的有机质热演化特征与阶段。研究表明：（１）镜质组反射率Ｒ°是西湖凹陷可靠的热演化标志；（２）孢子体的荧光变化特征具有特殊重要的热演化指示意义；（３）西湖凹陷煤系源岩有机质热演化具有明显的阶段性，可划分为五个热演化阶段。
Using organic petrologic analysis method, the characteristics and stages of organic matter thermal evolution of the source rocks (coal and mudstone) of the Tertiary coal measures in the Xihu Sag were studied. The results show that: (1) the vitrinite reflectance R ° is a reliable indicator of thermal evolution in the West Lake Sag; (2) the fluorescence characteristics of sporophytes have a special significance for thermal evolution; (3) Thermal evolution has obvious stage, can be divided into five stages of thermal evolution.