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方法从稠油生物降解宏观及微观特征入手，运用有机地球化学和稳定同位素分析，对达尔其油田稠油的地化特征及降解序列进行研究。目的分析稠油地化、成因特征及成熟度，为油田今后勘探指明方向。结果稠油宏观上具有饱和烃含量低，饱和烃／芳烃比值小的特点；微观上烷烃、芳烃色谱及生物标志物提供了稠油为两期混合油，且成熟度不高，降解程度较低。结论达尔其油田稠油属低─较低成熟油；稠油的降解程度可划分为三级；今后的勘探方向应以寻找稀油为主。
Methods Based on the macroscopic and microscopic characteristics of heavy oil biodegradation, the geochemical characteristics and degradation sequences of heavy oil in the Daliqi Oilfield were studied by using organic geochemical and stable isotope analysis. Objective To analyze the geochemical characteristics, genetic characteristics and maturity of heavy oil, and to point out the future exploration of oilfield. As a result, the heavy oil has the characteristics of low saturated hydrocarbon content and small ratio of saturated hydrocarbon to aromatic hydrocarbon in macroscopic view. On the microscopic scale, alkanes, aromatics and biomarkers provide heavy oil as a mixture of two phases with low maturity and low degree of degradation . Conclusions The heavy oil in Dal’erqi oil field is a low-low mature oil; the degradation degree of heavy oil can be divided into three levels; the future exploration direction should mainly look for thin oil.