THE STUDY ON THE ORGANIC GEOCHEMISTRY OF ISOMETAMORPHIC COAL AND VITRINITE—ROCK—EVAL PYROLYTIC ANALYSES

In this paper,detailed Rock-Eval pyrolyses have been carried out on the vitrinite and composition of various reductional- type coals(i.e.coal facies Ⅱ andⅢ)from the Northern Jiangsu and Southern Shandong provinces of the southern part of North China,and their geochemical features are also studied combining with anthracological identification and the measurement of fluorescent parameters.The above studies suggest the following three comments:1)the pyrolytic analysis could be an effective means for the potential evaluation on coal-derived hydrocarbon,2)the type of vitrinite should play a signigicant influence on the hydrocarbon poteintial derived from humic coal,in which rich hydrogen- bearing vit-rinites are the major contributors to hydrocarbon generation,3)exinoid compositions should also be the contributor to the hydrocarbon generation from humic coal,and 4)the rich hydrocarbon-bearing coal with coal facies Ⅱ and Ⅲin the study areas should be a cer-tain type of humic coal which essentially consists of fluorescence vitrinite and exinoid com-positions.