塔北地区不同海相源岩原油的识别

原油物性和饱和烃、芳烃分析资料表明，塔里木盆地塔北隆起一带的海相原油可分为碳酸盐岩原油和泥质岩原油。前者合硫量大于0．3％，相对较高，后者则低于0．3％。碳酸盐岩原油中重排蔬烷化合物较少，Ts／Tm和C15重排二环化合物／C15补身烷的值均小于1．0，C29和C35藿烷含量较高，含硫化合物中苯并喷吩含量相对高于二苯并噻吩。泥质岩原油的这些生物标志物组成和分布特征与碳酸盐岩原油的完全不同，反映出两类原油的源岩在沉积环境和岩性方面的差异。在轮南地区，这两类原油分布呈明显的分区性。

DIFFERENTIATION OF MARINE OILS FROM DIFFERENT SOURCE ROCKS IN TABEI REGION, TARIM BASIN

Based on the analytical data for physical property of oils and their saturated and aromatic fractions, marine oils from Tabeiregion of Tarim basin can be classified into two oil families, carbonate-derived and mudstone-derived oils. Compared with themudstone-derived oils, the carbonate-derived oi1s contain relatively high concentration of sulfur (above O. 3%). The oilsderived from carbonate source rocks are poor in rearranged terpanes, with both Ts/Tm and C,, rearranged bicyclic alkanes/drimane ratios are less then 1. 0, abundant in C29 and C35 hopanes, and rich in benzothiophenes relative to dibenzothiophenes.The oils from mudstone are different in these biomarker composition and distribution mentioned above, showing thedifferences in their depositional environment and lithology of oil source rocks. lt can be noted that the two types of oil inLunnan area of Tabei region are regularly reservoired in space and time.