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采用有机岩石学分析方法，结合有机地球化学资料，剖析了东海盆地西湖凹陷早第三纪烃源岩。该烃源岩富镜质组，贫惰性组，含一定数量的壳质组和腐泥组（１０％～３０％）。壳质组＋腐泥组含量与氯仿沥青、总烃和有效碳等参数密切正相关；树脂体和孢子体＋藻类体分别是早期生烃和晚期生烃的重要组分。在此基础上提出了西湖凹陷烃源岩的生烃模式。
Using organic petrology and organic geochemical data, the paper analyzed the early Tertiary source rocks in Xihu Sag, East China Sea. The source rock rich in vitrinite, poor inertia, containing a certain amount of chitin and sapropelite group (10% ~ 30%). The contents of chitosan + sapropel are closely related to the parameters of chloroform bitumen, total hydrocarbon and available carbon. The resin and sporophyte + algae are the important components of early hydrocarbon generation and late hydrocarbon generation respectively. Based on this, the hydrocarbon generation modes of source rocks in Xihu Sag are proposed.