关键词: 黄县褐煤, 萜类化合物, 热演化, 生物标记化合物, 成烃门限

Abstract: It is found that there is a high concentration of isopimarane and phyllocladane in Huangxian brown coal.It is possible that a certain diagenetic transformation precusor of coal(possibly dacrydium)causes such a distribution.In a lab experiment,as the temperature rises,the simulation concentration of diterpenoid hydrocarbons decrease greatly,especially at a level of 300℃ and the relative percentages of norpimarane decreases with maturity.The percentages of isopimarane and 4β(H)-19-norisopimarane change vary little in the whole thermal evolution process(low-medium maturation).This study also shows that index of 16α(H)-phyllocladane/16β(H)-phyllocl adane has a good correlation with index of 8α(H)-labdane/8β(H)-labdane,the two indexs are all very sensitive in the neighbourhood of petroleum generation threshold.The application of diterpenoid hydrocarbon in the areas of material sources of hydrocarbons as well as their maturation have also been analysed herein.