中文摘要：

为了探讨准噶尔盆地南缘西部山前断褶带原油的油源问题，根据原油地球化学特征，将该区原油分为3类。第1类原油的全油碳同位素组成一般重于-27‰，Pr／Ph值大于2，规则甾烷中C29甾烷含量较高，具反“L”字型分布特征，伽马蜡烷／C30藿烷值通常小于0.1；第2类原油的全油碳同位素组成为-28‰～27‰，Pr／Ph值为1～2，规则甾烷呈“V”字型分布，伽马蜡烷／C30藿烷值为0．2～0．3；第3类原油的全油碳同位素组成为-30‰～-29‰，Pr／Ph值小于1，规则甾烷呈“V”字型分布，伽马蜡烷／C30藿烷值在0．5左右。油源对比分析认为，第1、第3类原油分别与侏罗系八道湾组煤系烃源岩和湖相烃源岩具有较好亲缘关系，而第2类原油可能主要来源于侏罗系三工河组或（和）西山窑组湖相烃源岩。图7表1参15

英文摘要：

The crude oils in the study area can be classified into three groups. Group one is characterized by δ^13C values heavier than -27‰, Pr/Ph ratios higher than 2, the regular sterane with an inverted “L” pattern distribution of C29〉C27〉C28, and gamrnacerane/C30 hopanes less than 0.1; Group two by δ^13C values ranging from -27‰ to -28‰, Pr/Ph ratios ranging from 1 to 2, the regular sterane with a “V” pattern distribution, and gammacerane/C30 hopanes values ranging from 0.2 to 0.3; Group three by Na C values ranging from -29‰ to -30‰, Pr/Ph ratios less than 1, the regular sterane with a “V” distribution, and gamrnacerane/C30 hopanes values around 0.5. The oil/source correlation shows that the first and third group oils are respectively attributed to the coal-measure source rocks and the lacustrine source rocks of the Badaowan Formation, and the second group oil is originated mainly from the lacustrine source rocks of the Sangonghe or Xishanyao Formation.