Fouriertransformation infro - red microspectroscopy micro - ftir technique was used to investigate the chemical compositions and structures of cutinite , vitrinite and fusinite from jurassic coals in tarim basin at different temperatures . the results show that the chemical structure of cutinite is mainly composed of long aliphatic - side chain with minor amounts of aromatic compounds . vitrinite is mostly composed of aromatic compounds , in addition to large amount of short aliphatic - side chain compounds . whereas fusinite are dominant by aromatic structure . the study indicates that cutinite is one of the best oil source - rocks , with the higher hydrocarbon - generation potential ; vitrinite is one of better gas source - rocks , and has medium hydrocarbon - generating potential ; fusinite has little hydrocarbon - generating potential . in addition , the components of aliphatic structures of cutinite , vitrinite and fusinite decrease , the aromatics are enriched and condensation of aromatic structure increases with increasing the temperature , and along with the rise of temperatures , the intensity of aliphatic structure and heteroatomic compounds decrease obviously , however the aromatic structure changes a little
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