This study considers the Upper Cretaceous Qingshankou Formation, Yaojia Formation, and the first member of the Nenjiang Formation in the Western Slope of the northern Songliao Basin. Dark mudstone with high abundances of organic matter of Gulong and Qijia sags are considered to be significant source rocks in the study area. To evaluate their development characteristics, differences and effectiveness, geochemical parameters are analyzed. One-dimensional basin modeling and hydrocarbon evolution are also applied to discuss the effectiveness of source rocks. Through the biomarker characteristics, the source–source, oil–oil, and oil–source correlations are assessed and the sources of crude oils in different rock units are determined. Based on the results, Gulong and Qijia source rocks have different organic matter primarily detrived from mixed sources and plankton, respectively. Gulong source rock has higher thermal evolution degree than Qijia source rock. The biomarker parameters of the source rocks are compared with 31 crude oil samples. The studied crude oils can be divided into two groups. The oil–source correlations show that group I oils from Qing II–III, Yao I, and Yao II–III members were probably derived from Gulong source rock and that only group II oils from Nen I member were derived from Qijia source rock.

本研究考虑了松辽盆地北部北坡上白垩统青山口组，姚家组和嫩江组的第一段。古龙和齐家洼陷有机质含量高的深色泥岩被认为是该研究区的重要烃源岩。为了评估其发展特征，差异和有效性，分析了地球化学参数。一维盆地建模和油气演化也被用于讨论烃源岩的有效性。通过生物标记物的特征，评估了源-源，油-油和油-源的相关性，并确定了不同岩石单元中的原油来源。根据结果​​，古龙和齐家烃源岩的有机质不同，分别来自混合烃源和浮游生物。古龙烃源岩的热演化程度高于齐家烃源岩。将烃源岩的生物标志物参数与31个原油样品进行比较。所研究的原油可以分为两组。油源相关性表明，清Ⅱ—Ⅲ，瑶一和瑶二—Ⅲ段的I类油可能来源于古龙烃源岩，只有嫩I段的第二类油来源于齐家烃源岩。