Study on organic geochemical features of rich hydrogen coal in different coal accumulation areas

In order to provide the basic data to the clean utilization of the rich hydrogen coal, the basic geological features of the rich hydrogen coal were deeply analyzed. The typical rich hydrogen coal was selected from Leping, Fushuen and Shuicheng coal accumulated areas as the study objects, an optical microscope, rock pyrolysis, rock chloroform bitumen “A” extraction (Rock-Eval), gas chromatography - mass spectrometry combined analysis and other experiment means were applied to systematically analyze the organic geochemical features of the three rich hydrogen coal. The study results showed that the hydrogen contents of Leping coal, Fushun coal and Shuicheng coal were 6.14%, 5.00% and 8.06% individually. The H/C-O/C Van diagram and the pyrolysis HI-Tmax diagram results showed that the organic type of Shuicheng coal was an kerogen Type Ⅰ, Leping coal was kerogen Type Ⅱ1- Ⅲ2 and Fushun coal was kerogen Type Ⅱ2-Ⅲ deflected to kerogen Type Ⅲ. The TOC and S1+S2 values of Lepign coal and Shuicheng coal reached to 68.41%, 242.46 mg/g and 68.90%,282.40 mg/g individually and both the two coals excellent hydrocarbon generation potential. Fushun coal was in an immature stage, Leping coal was in an early mature stage and Shuicheng coal was in a mature stage. The essential substances of Fushun coal were came from the land-based higher plants, the essential substances of Shuicheng coal were came from the lower algae mainly and the essential substances of Leping coal were came from the land-based higher plants mainly and some lower organism.