摘要
首次在准噶尔盆地发现了来源于三叠系烃源岩的典型原油,其地球化学特征与以往发现的石炭系、二叠系和侏罗系烃源岩生成原油均不同。该原油全油碳同位素δ13C值为-31‰左右,与石炭系和侏罗系原油差异很大;生物标志物中富含重排甾烷、Ts、C29Ts及C30重排藿烷,而伽马蜡烷和β-胡萝卜烷含量低,与三叠系烃源岩抽提物中生物标志物的分布十分相似,而与二叠系和侏罗系明显不同。二叠系、三叠系和侏罗系烃源岩的地球化学特征对比分析研究表明,三叠系是仅次于二叠系的良好烃源岩,具有较高的生烃潜力,是该盆地中又一套重要的烃源岩层系。油源对比表明该原油来源于三叠系烃源岩。三叠系生源原油的发现对该盆地油气勘探具有十分重要的意义。
It is the first discovery of the crude oils derived from Triassic source rocks in the Junggar Basin. The geochemical characteristics of the oils differ from those of the oils derived from Carboniferous, Permian and Jurassic source rocks in the basin. The Triassic derived oils are mature crude oil with a normal density and viscosity, and are dominated by over 80%of saturated hydrocarbons. The oils are rich in isoprenoids, with Pr/Ph ratios around 1.0, and are isotopically light, with δ13C values generally around -31‰, are characteristically rich in diasteranes, Ts, C29Ts, C30 diahopane, and have a low content of β carotane and gammacerane. These biomarker features of the oils are similar to those of Triassic extracts, and are different from those of Permian and Jurassic extracts, which indicates the oils are derived from Triassic source rocks. The comparison of TOC content and the genetic potential of Triassic source rock with those of the Permian and Jurassic source rocks indicates that Triassic is a set of good and important source rock, with high hydrocarbon generating potential. The discovery of Triassic derived oils has an important significance for petroleum exploration in the Junggar basin.
出处
《地球化学》
CAS
CSCD
北大核心
2003年第6期582-590,共9页
Geochimica
基金
国家自然科学基金(49873001)
中国石油天然气股份有限公司资助项目(010109-3)
