摘要：

用色谱-质谱、稳定同位素质谱等分析测试技术，对柴达木盆地东部地区寒武系、奥陶系、泥盆系、石炭系和侏罗系岩样进行地球化学特征分析。从饱和烃生物标志化合物特征、正构烷烃单体碳同位素分布特征等方面入手，对该区的烃源岩的生源与沉积环境作了详细研究。结果表明，柴达木盆地东部地区古生界有机质多为菌、藻类生源，少数有陆源有机质混入（主要是石炭系）。有机质多为强还原环境的海相沉积，少数为海陆过渡相沉积。侏罗系在一些地区和层段并非典型的成煤环境，而是属于滨浅湖相，少数为半深湖—深湖环境，因此具有一定的生烃能力。

Abstract:

The geochemical characters of the Cambrian, Ordovician, Devonian, Carboniferous and Jurassic rock samples in the eastern Qaidam basin were investigated by means of GC-MS, GC-MS-MAT, etc. Based on saturated hydrocarbon biomarker characters and stable carbon isotope composition of individual n-alkanes, the sedimentary environment of this area were studied in detail. The results showed that in the eastern Qaidam basin, the Palaeozoic organic matters were mainly from bacteria and algae, and some Palaeozoic source rocks (mainly Carboniferous) contained terrestrial bio-inputs. Majority of these organic matters was deposited in a strongly reducing marine environment, and few of them in a transitional one. The Jurassic in some areas and some geologic period was deposited in an environment of lake beach or shallow lake (semi-deep to deep lake in local areas), not in a typical coal-forming environment; therefore, the Jurassic of the eastern Qaidam basin is of oil-generating potential.