Gas chromatography and chromato-mass spectrometry have been used to investigate the saturated hydrocarbon fraction of crude oil from the Sary-Bulak field (Zaisansk Basin, Kazakhstan). The high concentration of higher carotinoid cyclanes in the mixture investigated is shown: lexane (C33), gamma- and beta-carotanes (C40). The content of the latter hydrocarbon in the saturated fraction reaches 2.5%. Ways in which these cyclanes are formed from natural carotinoids are discussed. Mass spectra of the hydrocarbons identified are presented.