典型海相油和煤成油饱和烃生物标志化合物特征研究

Biomarker Characteristics of Saturated Hydrocarbon in Typical Marine Oils and Typical Coal-formed Oils

通过对塔里木盆地塔中隆起典型海相原油和吐哈盆地典型煤成油的饱和烃生物标志化合物系统剖析,对比分析了海相油与煤成油在饱和烃生标组合上的差异。海相油中Pr/Ph小于1,补身烷含量远高于升补身烷含量,三环萜烷含量丰富、富含C23、C24三萜化合物且C24四环萜烷含量较低,Ts/Tm较高、且伽马蜡烷含量明显高于煤成油,C27规则甾烷含量较高,而重排化合物含量较低。煤成油中Pr/Ph大于2.5,升补身烷含量高于补身烷含量,三环萜烷含量很低、富含C19、C20三萜化合物且C24四环萜烷含量较高,Ts/Tm很低、基本不含伽马蜡烷,C29规则甾烷含量相对较高;富含重排化合物。2类原油饱和烃生物标志化合物分布模式与组成特征揭示了其有机质的来源、类型、成熟度与沉积环境的差异。

By GC/MS analysis,the geochemical characteristics of typical marine oils from the Tazhong Area in Tarim Basin and typical coal-formed oils from the Tuha Basin indicated that there existed differences of compositional characteristics of saturated hydrocarbon biomarkers between two oil categories to deepen understanding of their origin.Pr/Ph of marine oils was less than 1,they contained higher drimane relative to homodrimane,riched in tricyclic terpanes,and they had abundant C23,C24 tricyclic terpanes but less C24 tetracyclic terpanes,Ts/Tm was higher,the gammacerane values were more greater than that in coal-formed oils.The content of C27 sterane was not greater;low rearranged compounds were contained.Pr/Ph of coal-formed oils is greater than 2.5;homodrimane is riched than drimane,less tricyclic terpanes contained,they have abundant C19,C20 tricyclic terpanes and major C24 tetracyclic terpanes,Ts/Tm and gammacerane values are very low,the content of C29 sterane is greater,rearranged compounds are abundant.The distribution pattern and compositional characteristics of the two categories of oils reveal that there exist differences of origins,organic types,maturies and depositional environment.