"Spectral and chemical methods were used to characterize the saturate and olefinic compounds in a Green River shale-oil gas oil. The saturates comprise 16 percent of the gas oil and were shown to be 50 percent n-paraffin, 40 percent branched paraffin, and 10 percent cyclic naphthenes with up to six condensed rings per molecule. The olefinic compounds comprise 19 percent of the gas oil and were shown to be 40 percent straight chains, 15 percent branched olefins, and 45 percent cyclic material. The cyclic naphthenes in the saturated portion of the gas oil are not nearly as highly substituted as are the cyclics in the olefinic material."