Abstract
Chinese coals are classified for 4 types, which are consist of Carboniferous-Permian coals, Jurassic coals, Cretaceous coals and Tertiary coals, on their depositional geologic ages. Each coal type is plotted each area separately on the van Krevelen diagram and calorific value vs volatile matter content diagram. The Tertiary coal is rich in hydrogen content as same as Japanese coals, but the Jurassic coal is less in volatile matter content than other types. Indonesian coal is a little less in hydrogen content than Japanese coal. But conversion ratios of liquefaction for some Indonesian coals are high because Indonesian coals are rich in resins vesicles generally.
