塔里木盆地海相混源油定量识别模式及其意义

Quantitative Identification Pattern and Its Significance of Marine Mixed Oils in Tarim Basin

塔里木盆地不仅是我国最大的含油气盆地,而且是我国目前发现的海相油主要勘探与开发领域。该文利用生物标志化合物绝对定量技术,通过对塔里木盆地来源于典型∈-O1的烃源岩的原油与来源于典型O2+3的烃源岩的原油的配比实验,提出了利用C28-规则甾烷/(C27+C28+C28)-规则甾烷和伽马蜡烷/C31-藿烷的图版作为塔里木盆地海相混源油定量识别模式,并对塔里木盆地主要海相原油的混合程度进行研究,指出混源油中混合了80%～90%的O2+3的烃源岩的原油,表明塔里木盆地的海相油主要来源于O2+3的烃源岩。

Tarim basin,which was the biggest hydrocarbon bearing basin in China,was the major exploration and development field of marine oil in our country.It was presented that the plate of C28/(C27+C28+C28) regular sterane ratio and Gammacerane /C31 Hopane can be used as the quantitative identification pattern of marine mixed oils based on the artificial oil-mixing experiments of typical oils from ∈~O1 and typical oils from O2+3 source rocks by absolute quantifying biomarkers.The study on mixing degree shows about 80%~90% composition of the mixed oils belong to the oils from O2+3,it indicates marine oils in Tarim Basin mostly originate from O2+3source rocks.