Thermoextractive conversions of oil shale are studied in the 450-500A degrees C range using supercritical fluids like toluene, decalin, tetralin, tetradecane, gas oil fractions, etc. It is shown that toluene and tetralin in 1:1 extractant:rock weight ratio are the best extractants. The composition of a specific synthetic oil was determined by chromato-mass spectrometry.