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Understanding the content and geochemical characteristics of shale oil are two significant aspects of shale oil exploration and evaluation. This paper details the analysis of 32 shale samples extracted by sealed coring from the first member of the Upper Cretaceous Qingshankou Formation (K₂qn¹) in the Southern Songliao Basin, northeast China. Geochemical techniques including Rock-Eval pyrolysis, contents of total organic carbon (TOC) and clay mineral identification by X-ray diffraction (XRD) were performed on the samples. A total of 13 samples were further analyzed using two-dimensional nuclear magnetic resonance (2D NMR) and the quantitative grain fluorescence on extract (QGF-E) technique to determine the content and properties of different types of organic matter (OM) in the shale reservoir. The OM content and spectral intensity obtained from the NMR and QGF results were positively correlated with …