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Study on kinetics of hydrocarbon generation.from coals in the Qinshui Basin

Science Bulletin 2005年第17期 90-97页

作者： DUAN Yi1, WU Baoxiang1,3, ZHENG Chaoyang1,3, WANG Chuanyuan1,3, ZHANG Hui1, TAO Mingxin1, LIU Jinzhong2 & ZHANG Xiaojun1,3 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China 2. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 3. Graduate School of Chinese Academy of Sciences, Beijing 100039, China

A new method for the quantitative assessment of hydrocarbon generation.potential from coals by means of the chemical reaction kinetics has been developed gradually over the recent years. In this paper, the kinetic parameters of hydrocarbon gas generation.are determined by high tem-perature and pressure, and closed- system thermal simula-tion for Late Paleozoic coals in the Qinshui Basin and the kinetic characteristics and the histories of hydrocarbon gas generation.were studied using the parameters obtained. Re-sults show that during the longer period from the Triassic (T) to the Middle Jurassic (J2), the coal-derived methane yield increased more slowly under lower palaeogeotemperature in the Qinshui Basin; however, the shorter period from Late Jurassic to Early Cretaceous, the coal-derived methane yield increased more rapidly under higher palaeogeotemperature. The correlation between the thermal simulation and the fac-tual data shows that C1/ (C1+C2―4) coefficients computed by the histories of methane and C2―C4 hydrocarbon generation.can provide evidence for the identification of the genesis of coal bed gas in the different areas of the Qinshui Basin. The kinetic simulating experiment of hydrocarbon generation.for the peat considered as the original matter of coal formation was performed for the first time and the simulated results were compared with the characteristics of hydrocarbon gen-eration from coals undergoing various palaeogeotemperature in the Qinshui Basin. The result indicates that the peat has a higher potential of hydrocarbon generation.than that of coals. Therefore, the hydrocarbon generation.results obtained from kinetic simulation for coal with higher maturation rank could not stand for their original hydrocarbon generation.potential and thus would lead to an underestimation for coal-bed gas resource. The generative amount of coal-derived gas in the Qinshui Basin was predicted using kinetic simula-tion results for the peat and their maximum was est

关键词： Qinshui Basin hydrocarbon generation.of coal kinetic simulation prediction for the amount of coal-derived gas generation.

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