Qualitative and quantitative analyses of nitrogen functional groups in solvent-extracted bitumen and produced oils from the Northwest Asphalt Ridge (Utah) tar sand deposit have been completed. Although the chemical and physical properties of produced oils (from a reverse/forward combustion project and a steamflood project) were different, the distributions of nitrogen functional groups in these oils were similar. From 54 to 62 % of the nitrogen content was nonbasic and very weakly basic, comprised mostly of amide and indole-type nitrogen. From 30 to 35% was weakly basic, comprised mostly of pyridine-type nitrogen. Significant differences were found in the hydrogen- and carbon-type distributions in these oils. It is suggested that the nitrogen compounds in these oils differ primarily in the amounts of aromatic/aliphatic hydrogen and carbon rather than in the distribution of nitrogen functionality. In situ production methods used to recover oil may predominantly affect the non-nitrogen moieties.