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柴达木盆地北缘是柴达木盆地三大油气区之一 ,其源岩为早、中侏罗世煤系地层。烃源岩有机质类型以Ⅲ1型和Ⅱ型干酪根为主 ,Ⅰ2 型干酪根仅在局部地区有分布。通过对柴达木盆地北缘侏罗系烃源岩中不同类型干酪根的13 C核磁共振研究 ,指出了研究区Ⅰ2 、Ⅱ、Ⅲ1型干酪根的化学结构特征以及化学结构中“芳构碳”、“油潜力碳”与“气潜力碳”的相对含量 ,据此从定量分析的角度对不同类型干酪根的生油气贡献作了评价。Ⅰ2 、Ⅱ、Ⅲ1型干酪根的生烃能力依次减弱 ,对生油的贡献也依次减弱 ,且生成油气的比例不同 ,Ⅰ2 、Ⅱ型干酪根以生油为主 ,Ⅲ1型干酪根则以生气为主。
The northern margin of the Qaidam basin is one of the three major oil and gas regions in the Qaidam Basin. Its source rocks are early and middle Jurassic coal measures. The organic matter types of source rocks are mainly Type III1 and Type II kerogens, Type I2 kerogens are only distributed in some areas. Through the 13 C NMR study of different types of kerogen in the Jurassic source rocks on the northern margin of the Qaidam Basin, the chemical structure characteristics of the kerogen types I2, II and III1 in the study area and the “aromatic carbon ”,“ Oil potential carbon ”and“ gas potential carbon ”, the contribution of different types of kerogen to hydrocarbon generation from the quantitative analysis point of view was evaluated. The hydrocarbon generation abilities of types I2, II and III1 kerogen decrease in turn and the contributions to oil generation decrease in turn, and the proportions of hydrocarbon generation are different. Type I and II kerogens are mainly oil-derived and type III kerogen is angry Mainly.