The composition of sulfur compounds in bitumen and pyrolysis products of kerogen, which were isolated from oil shales and source rocks of the Sysola shale-bearing region, was studied. The sulfur compounds of the aromatic fraction of bitumen were represented by isomeric C-20 thiophenes with the phytane carbon skeleton. The majority of high-molecular-mass sulfur compounds were represented by fragments of sulfur-bound lipids with the normal isoprenoid and polycyclic carbon skeletons. n-Alkylthiophenes prevailed among the sulfur components of the kerogen pyrolyzate. For the rocks containing maximal C-org concentrations, bi- and tricyclic moieties containing thiophene and aromatic cycles prevailed in the kerogen pyrolyzate. This was related to a chan-e in the direction of thermal degradation of the sulfur-bound fragments of kerogen with an increase in the number of sulfide bridges. The relative amount of C-1-C-4 2,5-substituted thiophenes increases with an increase in C-org, thus indicating that the sulfur-binding of carbohydrate moieties in the formation of rocks with a high C-org content was more intense.