中文摘要：

柴达木盆地北缘侏罗系烃源岩分为泥岩、炭质泥岩、煤和油页岩4种类型，不同类型烃源岩的生烃性能、生物标志物分布特征具有明显的差别，侏罗系沉积相分布对有效烃源岩有明显的控制作用。通过原油、烃源岩生物标志物地球化学特征对比，揭示出冷湖三号、南八仙部分原油和马北油田原油来源于母质类型较好的腐泥型烃源岩，这类优质烃源岩主要为中侏罗统上部泥岩和油页岩，主体分布在赛什腾凹陷和鱼卡凹陷，围绕这类优质烃源岩分布的有利勘探区，应主要分布在马仙断裂以北临近优质烃源岩的地区，以及冷湖六号、冷湖七号构造带。

英文摘要：

Distribution of sedimentary facies obviously controls effective source rock in the northern margin of Qaidam basin. Source rocks in the area mainly include four types like as mudstone, coal, carbonaceous mudstone and shale. There are obvious differences between their hydrocarbon generation potential and characteristics of biomarkers. Oil-source correlation indicates that petroleum in Lenghu 3, Nanbaxian and Mabel oilfield would be derived from sapropelite. Oil and gas exploration in the northern Margin of Qaidam basin should not only pay attention to Jurassic coal measure, but also to sapropelic. These high quality sa- propelic sources mainly consist in the middle Jurassic mudstone and oil shale, located in the Saishiteng and Yuka sag. Favorable exploration area for these hydrocarbon source rocks should focus on the north of Maxian fault and Lenghu 6 and Lenghu 7 tectonic belts.