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从辽河盆地东部凹陷下第三系沙三段煤系烃源岩中检出了特高含量的海松烷，脱氢松香烷等三环二萜烷和扁枝烷等四环二萜烷类化合物，此外还检测到了奥利烯、乌散烯等罕见的三萜类。上述三类化合物尽管出现在同一套地层中，但它们的主要来源并不完全相同，其中三环二萜和四环二萜类分别以裸子植物和蕨类植物为主要来源，而五环三萜类则主要来源于被子植物。说明辽河盆地下第三系沙三段煤系地层中母质输入的多样性和复杂性。
A series of tetracyclic diterpenes, such as tricyclic diterpenes and flat clams, were detected from the source rocks of coal measure of the third member of Es3 in the eastern depression of Liaohe Basin. In addition, rare triterpenes such as Orene and UCSF were also detected. Although the above three compounds appear in the same set of formations, their main sources are not all the same. Among them, tricyclic diterpenes and tetracyclic diterpenes are the main sources of gymnosperm and fern respectively, while pentacyclic triterpene The main category is derived from angiosperms. It shows the diversity and complexity of the input of parent material in the coal measures strata of the Lower Tertiary in the Liaohe Basin.