Data on the features of the composition of the Upper Jurassic rocks of the Vostochno-Paiduginskaya exploration well of the section of the Maryanovsk and Naunaksk suites are presented. The distributions of normal and isoprenoid alkanes, phenanthrenes, steranes, hopanes, alicyclic and aromatic hydrocarbons are characterized. It was found out that organic matter (OM) was deposited throughout the section under study under oxidizing conditions. The sediments of the Naunaksk formation were formed in a shallow basin uncontaminated with hydrogen sulfide, while the OM of the Maryanovsk formation was formed in lacustrine environment. The presence of low concentrations of gammacerane in the Maryanovsk formation and the lower parts of the Naunaksk formation indicates weakly saline waters of the sedimentation basin during this period. The participation of higher plants in the formation of the OM composition of the Naunaksk rocks is evidenced by the high concentrations of cadalene, retene, and the presence of simonellite and C25 and C27 n-alkanes.