Recent years have seen an increased interest in studying the characterization, composition, and properties of solid and viscous liquid natural bitumen. These kinds of fossil fuels are allochthonous, non-disseminated organic matter and often viewed as remnants of altered oils which have been subjected to secondary processes such as biodegradation, water washing and/or maturation. Asphaltite as one of the most important forms of this type of fossil fuels is mainly composed of hydrocarbons, as well as relatively large amounts of sulphur- and nitrogen-containing compounds. In this research project we investigate possible geological and geochemical controls on the distribution of different compound chemical classes in solid bitumens in surface and reservoired locations. Furthermore, by investigating the related potential source rocks and oils, it is expected to correlate them with solid bitumens and discover how these different geological conditions (e. g. thermal maturity and/or biodegradation) influences on their chemical composition.