Capillary-column gas-chromatography/mass-spectrometry was performed on acid, base, and neutral fractions of liquid filtrates and particulate-phase methylene chloride extracts of composite samples of raw process water collected from two in situ tar-sand oil recovery experiments. The experiments, conducted by Laramie Energy Technology Center, were the reverse/forward combustion experiment (TS-2C) of 1977 and the steam injection experiment (TS-1S) of 1980. Some 143 extractable/chromatographable organic compounds were tentatively identified in the TS-2C sample, and 95 were identified in the TS-1S sample. The predominant organic groups in the TS-2C process water included cyclic cyclohexonyl compounds, acetophenones of ketones, and alcohols in the neutral fraction; quinolines and isoquinolines, pyridines, phenyl piperidines, and pyrazoles in the base fraction; and phenols, carboxylic acids, and lactones in the acid fraction. Predominant in the TS-1S process water were alkenes or cyclohexanes, cyclic ketones, and toluenes in the neutral fraction; quinolines and isoquinolines, acridines, pyrazoles, pyridines, phenol piperdines, and piperidines in the base fraction; and phenols in the acid fraction.