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广西钦州稔子坪矿褐煤的芳烃馏分中 ,普遍存在芳香倍半萜类、二倍半萜类、芳香三萜类及苯并藿烷等标志化合物。其饱芳比为 0 2 9,芳香萜类占芳烃馏分总量的 80 7 ,以芳香倍半萜类和陆源芳香三萜类为主 ,芳香二萜类含量甚微。该褐煤富含五环三萜类及倍半萜 ,表明其生源构成以双子叶被子植物及裸子植物为主。成岩早期 ,细菌活动相当强烈。高等植物经细菌作用改造后 ,陆源三萜类易芳构化形成脱A三萜烷和双芳 - 8,1 4-断三萜类 ,从而使陆源高等植物的“腐泥化”程度增加 ,并可能成为低熟油的良好烃源岩。
Aromatic compounds such as aromatic sesquiterpenes, sesquiterpenoids, aromatic triterpenoids and benzoguanoban are commonly found in the aromatic fractions of lignites from Chenzi Pingdingshan, Qinzhou, Guangxi. The aromatic ratio is 0 2 9. The aromatic terpenoids account for 80 7 of the total aromatic fractions, mainly aromatic sesquiterpenes and terrestrial aromatic triterpenoids, with very little aromatic diterpenoids. The lignite is rich in pentacyclic triterpenoids and sesquiterpenes, indicating that its raw material composition of dicotyledon angiosperms and gymnosperms. Early diagenesis, bacterial activity is quite strong. After the transformation of higher plants by bacteria, terrigenous terrigenous terrains of ternary terrains are dealkanated to form triterpenoids and bis-aryl-8,1 4-triterpenoids, which increases the degree of “saprosis” of terrestrial higher plants, And may be a good source rock for low-mature oil.