关键词: 关键词：油砂沥青质, 固体核磁共振, 化学结构特征, 油砂沥青质, 固体核磁共振, 化学结构特征

Abstract: Chemical structure of bitumen from oil sand was studied with 13C NMR. Through the analysis of the NMR spectra, 12 carbon skeleton parameters characterizing oil sand bitumen structure were obtained. As the result of the analysis，content of lipid carbon in oil sand bitumen was around 60%，showing predominant lipid carbon structure. The major component of aliphatic carbon，methylene carbon was mostly in the aliphatic chain. The average length of aliphatic chains was less than 8 carbon atoms，which belonged to medium length. Aromatic carbon content was less than 40%，and protonated aromatic carbons were greater than non-protonated aromatic carbons. Bridghead aromatic carbon was the most in the non-protonated aromatic carbons，inferring aromatic carbon in the polycyclic mode. Carbonyl carbon in oil sand bitumen accounted for only an extremely small amount. Although according to elemental composition，oil sand bitumen could be classified as Type Ⅰ kerogen，but there was difference in hydrocarbon generation potential and structure characteristics. The oil sand bitumen was not the degradation product of kerogen.

Key words: Keywords：oil sands bitumen, solid state 13C NMR, chemical structure characteristics, oil sand bitumen, solid state 13C NMR, chemical structure characteristics