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

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