塔里木原油饱和烃生物标志物分布特征

Distribution Characteristics of Saturated Hydrocarbon Biomarkers in Oils from Tarim Basin

塔里木盆地陆相原油二环倍半萜烷系列中，Ｃ１５补身烷低于Ｃ１６升补身烷（Ｃ１５／Ｃ１６＜１．０），重排二环化合物丰富。这些原油的三环萜烷以低碳数（Ｃ１９～Ｃ２１）化合物占优势，（Ｃ１９＋Ｃ２０＋Ｃ２１）／（Ｃ２３＋Ｃ２４）＞１．４；其中湖相油以Ｃ２１为主峰，煤成油以Ｃ１９为主峰。五环三萜烷中普遍富含Ｃ２９，Ｃ３０重排藿烷和Ｃ２９Ｔｓ及一个未知的Ｃ３０五环三萜烷。它们有较丰富的长链类异戊二烯烃，其中煤成油含有较高的Ｃ２７～Ｃ３９头对头系列。海相原油在这些生物标志物分布上则完全不同。

By GC/MS analysis,the saturated fractions of terrestrial oils from the Tarim basin contain lower C 15 drimane relative to C 16 homodrimane, with C 15 /C 16 ratio<1 0, and abundant rearranged bicyclanes in bicyclic sesquiterpanes It is noted that tricyclic terpanes in the oils are dominated by low carbon number (C 19 -C 21 ) compounds,having a ratio of (C 19 +C 20 +C 21 )/(C 23 +C 24 )>1 4,and a maximum at C 21 in the lacustrine oils and at C 19 in the coal derived oils These terrestrial oils are rich in C 29 and C 30 rearranged hopanes and C 29 Ts as well as a unknown C 30 compound in pentacyclic triterpanes They have relatively higher amount of long chain acyclic isoprenoid hydrocarbons, in which the coal derived oils are characterized by abundant C 27 C 39 “head to head” series In contrast, the marine oils show significantly different biomarker distributions mentioned above