COMPOSITION AND PROPERTIES OF PERMIAN BIT UMEN FROM TATARIYA AS A FUNCTION OF PROPERTIES OF SURROUNDING DEPOSITS

Composition of natural Tatarian bitumen (high-viscous oils, malthas, a sphalts, and asphaltites) from different Permian stratigraphic complex es - terrigenic and carbonate sediments has been studied by using gas chromatography and thermal analysis. It has been stated that Tatarian bitumen sampled ''as-flow'' and extracted from bitumen-bearing rocks h ave the same nature but differ in composition and properties. Four gro ups: A1, A2, B1, and B2 may be distinguished by the contents of normal and isoprene alkanes in their composition. No direct relationship was found between the chemical type of the rock and the sample density or sulfur content and hence the content of vanadilic porphyrins. Oils co ntent decreases as the biodegradation increases changing from type A1 to B2 and further to B1, whereas the trend for asphalten content has a n opposite direction.