Abstract
Coal pyrolysis test of vitrinite and sporinite has revealed that vitrinite reflectance (Sekiguchi and Hirai. 1981) and sporinite fluorescence maximum (Ting and Lo, 1975) exponentially increases with increasing temperature. While, it has been reported that the increase of vitrinite reflectance during hydrogenation was much smaller than that of coal pyrolysis and that vitrinite reflectance is greately suppressed in vitrinite macerals associated with hydrogen-rich kerogen (Price and Barker. 1985 and others). Fujii et al. (1982; 1988) reported that vitrinite reflectance is decreased with increase in the hydrogen-rich degradinite percentage and that sporinite fluorescence maximum is increased with increase in the hydrogen-rich degradinite percentage.During coal hydrogenation stage or oil generation stage, in vitrinite macerals, vitrinite reflectance suppression is caused by an incorporation of certain amounts of hydrogen into vitrinite macerals through dehydration of hydrogen-rich degradinite and sporinite. On the other hand, in sporinite, chemical dehydration by loss of hydroxyl groups and increase in aromatic nature leads to longer wavelength of sporinite fluorescence maximum.
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