Fast pyrolysis of Goynuk oil shale (GOS), polypropylene (PP) and the blend of GOS:PP on a 1:3 total carbon ratio basis was studied. The maximum product evolution temperature and the existence of synergistic effect were determined and the characteristics of pyrolysis products by carbon number were investigated. Pyrolysis products were analyzed by capillary gas chromatography. The volatile fraction of pyrolysis products was classified according to carbon number. Conversion to the volatile fraction of recovered hydrocarbons in fast co-pyrolysis of GOS:PP increased with increasing temperature. The effect of PP on the conversion of GOS was determined by calculating the difference between experimental and hypothetical mean values of conversion of total organic carbon into volatile products and a slight synergistic effect was observed at 600 degrees C (4.78%) and 650 degrees C (5.07%).