Being one of the important unconventional oil resources,oil sand is well worth of geochemical study so as to better guide its resource assessment.Thirteen oil sand samples were collected from Tumuji ranch in western Songliao Ba-sin and analyzed for oil yield,bulk composition and GC-MS.The result shows that the oil yield of oil sand is high,and non-hydrocarbon components dominate the bulk composition.Most compounds in saturated and aromatic hydrocarbon fractions were largely biodegraded.The n-alkanes,isoprenoid alkanes,hopanes and steranes were all degraded in varying degree except for tricyclic terpanes.No 25-norhopane series has been detected in the studied sample suite.The naphtha-lene and phenanthrene series were all destroyed but the triaromatic steroids are intact.These oils are derived from single source rock system on the basis of biodegradation resistant compound signatures.%油砂是重要的非常规油气资源，对油砂的地球化学研究可以更好地指导油砂资源潜力评价。收集了13件松辽盆地西部图牧吉农场的油砂样品，并做了含油率、族组成以及色谱－质谱（ GC－MS）分析。实验结果显示图牧吉油砂含油率较高，族组分中以非烃含量为最高。 GC－MS分析饱和烃和芳香烃馏分中大部分化合物被降解，其中正构烷烃、藿烷和甾烷系列均受到不同程度降解，三环萜烷抗降解能力较强未受影响。芳烃化合物中萘和菲等化合物都已消失，三芳甾系列较完整。油砂中没有出现25－降藿烷系列，降解程度为6～8级，通过抗降解能力较强的化合物判断，原油基本来自同一油源。
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