Abstract
The article discusses the distribution patterns and formation conditions of natural bitumen and high-viscosity oil accumulations in Central Asia, and gives their geochemical characteristics, classification and genetic types. Based on the analysis of the geochemical characteristics of heavy natural bitumens and high-viscosity oils within the Fergana, Afghan-Tajik, Zarafshan and Bukhara-Khiva oil and gas bearing regions (BKhOGR), four types of natural bitumen accumulations and three groups of high-viscosity oils, which differ not only by the spread area but also by the material composition of hydrocarbons, were identified. On the basis of the analysis and generalisation of the results of geochemical research within the study area, the main factors for the formation of different types of natural bitumens and high-viscosity oils in Central Asia have been identified and substantiated.
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