DIFFERENTIAL STUDY ON VITRINITE REFLECTANCE OF MACERALS FROM COAL AND KEROGENS OF DIFFERENT HOST ROCKS

The influence of hostrock petrofacies on vitrinite reflectance for organic elastics is an important problem in the study of thermal evolution of organics. The coal in coal-bearing strata and kerogens in several dominant rocks of Carboniferous-Permian in Huaibei (north Anhui) were measured for vitrinite reflectance, moreover the methods of data process and value determination for vitrinite reflectance of despcrsed organics were also studied. The results show that the vitrinite refleetance in kerogen from mudstone, sandstone, limestone differ from that of coal in the same horizon by +6 — -10%,-1 — -16% and +4 — -14%, respectively, which means that the data process and value determination for vitrinite reflectance are more important than the reflectance determination itself.