The quantification of the part of organics that is not included in the structure of kerogen and can be exfracted from oil shale matrix, is feasible by application of analytical supercritical fluid extraction (SFE) with CO2 as an eluent. The extraction power for a certain type of compounds was evaluated and the selective extraction was achived in wide limits of pressure, temperature and modifiers used in SFE. Study of the possibilities of extraction included, besides the speed-up of the analysis, also the determination of geochemically significant compounds (biomarkers like pristane and phytane as well as steranes and triterpanes) and of carbon number distribution of n-alkanes in extractable organic matter. A very good correlation with classical Soxhlet extraction data was achived.