Abstract: The Tarim ails in origin can be divided into four oil families according to the composition of aromatic hydrocarban;marine platform ail of northern Taritn Basin.restricted bay(lagoon) oil of central Tarim Basin.lacustrine oil and coal-derived oil.Relative to Tabei marine oil,Tazhong oils have higher amount of dibenzothiophene homologues(>30%)and lower phenanthrenes(<15%).and to lacustrine oils,caal-derived coils higher biphenyl(>20%)and dibenzofuran(>5%)homologues.The distribution of alkylnaphthalene and alkypenanthrene isomers shows significant difference in these various kinds of ails.The 1.2,5-/1,3,6,-trimethylnaphthalene(TMN) values of marine oils are less than 0.3 and lacustrine oils and coal-derived oils mare than 0.3 and 0.6 respectively.The research result indicates that 1,2,7-/1.3.7-TNM ratio of these oils can be used to determine the geological age of their source racks.Compared with marine oils,methyphenanthrenes of terrestrial oils,especially coal-derived oils,are dominated by 9-methyphenanthrene generated by methylatian of phenanthrene.

Key words: Tarim Basin, organic geochemistry, oil, aromatic hydrocarbon, oil-source correlation, gealagical age

摘要： 从芳烃组成上,塔里木原油可划分为塔北台地相原油、塔中局限性海湾(泻湖)相原油和湖相油、煤成油四种成因类型.塔中原油以高二苯并噻吩系列(>30%)和低菲系列(<15%)为特征,区别于塔北海相原油;煤成油则以高联苯(>20%)、二苯并呋喃系列(>5%)有别于湖相油.这些不同成因原油的烷基萘、菲异构体分布明显不同.海相油的1,2,5-/1,3,6-TMN小于0.3,而湖相油和煤成油的此比值分别大于0.3和0.6.原油的1,2,7-/1,3,7-TMN可识别源岩的地质时代.与海相油相比,陆相油尤其是煤成油的9-甲基菲占优势,与国外的研究结果不同.

关键词: 塔里木盆地, 有机地球化学, 原油, 芳烃, 油源对比, 地质时代