As one of the most petroliferous oil producing area in Kuqa depression, Dawanqi (DWQ) oilfield is supplying with great attention. In this regard, the geochemical characteristics and oil families from DWQ field were investigated using molecular compounds analysis of GC, GC–MS techniques. The bulk geochemistry of oils from DWQ oilfield displays complicated molecular composition characteristics, including relative higher indices of Pr/Ph (1.4 ~ 4.26, with an average of 2.4), high concentration of light hydrocarbons and certain abundant pentacyclic triterpene and steranes. The C₇ light hydrocarbon and isoprenoids ratios indicate the oils were derived from terrestrial and higher plant input in weak oxidizing and reducing environment. Most of the oils are among the mature oils in the study area, except a few samples that are identified as slightly biodegraded by C₇ hydrocarbon. Three oil families are identified in DWQ oilfield of Kuqa depression by biomarker analysis and geochemical parameters. The family A shares the attributes with higher amount of tricyclic terpanes, such as C₁₉- C₂₀ tricyclic terpane, higher C₂₄-tercyclic terpane, lower concentration of gammacerane (< 0.6) but poor diasteranes. Family C is characterized with lower content of C₁₉-tricyclic terpane than C₂₀ tricyclic terpane, low C₂₄-tercyclic terpane than C₂₃-tricycli terpane, relative high concentration of gammacerane (> 0.6) but poor diasteranes. The oils of family B are mixed from the two types, showing mixed features of family A and C. The results can shed light for the exploration of the studied area.

作为库车坳陷含油量最高的产油区之一，大湾旗（DWQ）油田的供应备受关注。在这方面，使用GC、GC-MS技术的分子化合物分析研究了DWQ油田的地球化学特征和油族。DWQ油田原油整体地球化学表现出复杂的分子组成特征，Pr/Ph指数相对较高（1.4～4.26，平均为2.4），轻烃含量高，五环三萜和甾烷含量丰富。C ₇轻质烃和类异戊二烯的比率表明，这些油来源于弱氧化和还原环境中的陆地和高等植物输入。除了少数样品被鉴定为被 C ₇烃轻微生物降解外，大多数油都属于研究区的成熟油。通过生物标志物分析和地球化学参数，在库车坳陷DWQ油田中鉴定出3个油族。A族与较高量的三环萜烷共享属性，例如C ₁₉ - C ₂₀三环萜烷、较高的C ₂₄ -三环萜烷、较低浓度的伽马蜡烷(< 0.6)但差的二甾烷。家族C的特征在于C ₁₉ -三环萜烷的含量低于C₂₀三环萜烷，C ₂₄ -三环萜烷比C ₂₃ -三环萜烷低，伽玛蜡烷浓度相对较高（> 0.6）但二甾烷较差。B族油类由两种类型混合而成，呈现出A族和C族混合特征，结果可为研究区的勘探提供参考。