Chemical constitutions of vitrinites in Jurassic coal measures in eastern Junggar basin and Turpan-Hami basin

and Permo-Carboniferous coal measures in Ordos basin

are studied through solid-state

13

C NMR and transient pyrolysis-GC/MS. The aliphatic carbons in Jurassic hydrogen-rich desmocollinites have relatively high proportion of methylene carbon(-CH

2

-)

and the proportion of aliphatic hydrocarbons in pyrolysis products are relatively high. Being compared with desmocollinites

although the Jurassic telocollinites are also hydrogen-rich

their aliphatic carbons have even higher proportion of methyl(-CH

3

)

methine(-CH-) and quaternary carbon

and their pyrolysis products are mainly phenols and alkylbenzenes

with more branched substitiuents but shorter chain length. Though the Permo-Carboniferous vitrinites in Ordos basin are mostly composed of desmocollinites

they contain a relatively small proportion of aliphatic carbons

and most of which are gas-prone carbons. The pyrolysis products are mainly phenols and aromatic hydrocarbons

thus they are typical gas source rocks. With similar maturities

the structures of vitrinites are determined by sedimentary environments and original bilological materials. Ultramicroliptinites might have contributed to the relatively high constitutions of long chain aliphatic hydrocarbons in hydrogen-rich vitrinites in eastern Junggar and Turpan-Hami basins. Based on comparison with pyrolysis products of phycoplast

cutinites

sporinites and suberinite

and in combination with other evidences

it is believed that exinites of higher plants are more likely to be the main components of Ultramicroliptinites.