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本文着重报道了贵州三都早奥陶世同高组下燕高页岩段生物标志化合物特征，首次在采自该层位的样品中检出丰富的正烷烃、链状类异戊二烯烷烃、萜类化合物及甾类化合物。测试结果显示：正烷烃图谱呈双驼峰形，碳数分布为ｎＣ１５～ｎＣ３５，以ｎＣ１８为主峰碳，ｎＣ２９为次主峰碳，Ｃ－２１／Ｃ＋２２为０．７７～１．０２，ＯＥＰ为０．９４～１．０４；植烷占优势，Ｐｒ／Ｐｈ为０．４０～０．４６；藿烷碳数为Ｃ２７～Ｃ３５，以Ｃ３０占优势，Ｃ２７＋Ｃ２９＜Ｃ＋３１；仅见碳数分布为Ｃ２０～Ｃ２９的长链三环二萜烷，以Ｃ２８为主峰碳；甾烷丰度顺序为Ｃ２９甾烷＞Ｃ２７甾烷＞Ｃ２８甾烷，同时检出了孕甾烷和４－甲基甾烷。生物标志化合物显示出还原环境特点，且可能主要来自藻类。
In this paper, the characteristics of biomarker compounds in the Xiayanyan shale of the Early Ordovician in Sandu, Sandu, Guizhou, are reported. For the first time, abundant n-alkanes, isoprenoids and terpenoids are detected in the samples collected from this horizon. Class compounds and steroids. The results show that the n-alkane spectrum has a double hump shape and the carbon number distribution is nC15 ~ nC35, nC18 is the main peak carbon, nC29 is the second main peak carbon, C-21 / C + 22 is 0.77 ~ 1.02 and OEP is zero. 94 ~ 1.04; phytane is dominant, Pr / Ph is 0.40 ~ 0.46; hopane carbon number is C27 ~ C35, dominated by C30, C27 + C29 C27 steranes> C28 steranes, gestone and 4-methyl steranes were detected at the same time. Biomarker compounds show the characteristics of the reducing environment, and may come mainly from algae.