Abstract
A comparative investigation of the composition of polycyclic biomarkers (steranes and triterpanes) in the extracts from the Paleocene Boltysh oil shale obtained by methanol-modified supercritical carbon dioxide and conventional Soxhlet chloroform extraction was carried out using computerized GC-MS. The extracts are similar in the geochemical parameters calculated on the basis of the stereoisomeric composition of steranes and triterpanes which: (1) are indicative of lacustrine sedimantary organic matter (OM); (2) show the higher plant contribution to the mainly alginitic OM of oil shale; and (3) are characteristic of low-mature OM.
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