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《GEOCHIMICA》 1996-04
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THE STUDY OF MICROLIPTINITE BY CONFOCAL LASER SCANNING MICROSCOPE AND ITS SIGNIFICANCE FOR HYDROCARBON GENERATION IN JURASSIC COALS FROM TUHA BASIN AND ERLIAN BASIN

LiuDehan;SunYongge;ShenJiagui;FuJiamo;ShengGuoying (Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640)WangChanggui;LongDaojiang (Tuha Oilfield Institute of Exploration and Development Research)  
Abundant coal-generated oil and gas have been discovered in Tuha basin, China.This paper investigated the types, contents and distributions of microliptinite in coals and its relationship with the formation and productivity of coal-generated oil and gas. The results show that most of the coal samples have exinite of 10%, but they have S_1 of 5-23mg /g, S_2 of 151-200mg/g and Hydrogen Index of 150-350mg /g in Rock-Eval analysis, and demonstrated its good potential for hydrocarbon generation. The CLSM observation indicated that they were rich in microliptinites, with a content of 3%-18% according to the microarea quantity method, in desmocollinite and leafcorpocollinite in some lamellar and banded coal samples. This may be one of the reasons for the high values of S_1+S_2 in these coal samples.It suggested that the desmocollinites had made an significant contribution to hydrocarbon generation. Meanwhile, because the distributions of microliptinites in coals exist as point-line,bed like filling and network shape, they facilitate the migration and accumulation of coalgenerated oil and gas.
【CateGory Index】: TE12
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