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《Acta Sedimentologica Sinica》 2006-04
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Discussion on the Maturity Threshold of Primary Kreogen for Cracking Gas Generation from Humic Coal

HU Guo-yi~(1) WEI Zhi-ping~(1) XIAO Zhi-hua~(2) LI Zhi-sheng~(1)LI JIAN~(1) WANG Chun-yi~(1)(1.Research Institute of Petroleum Exploration and Development(Langfang),PetroChina,Langfang,Hebei 065007;2.China University of Mining and Technology,Beijing 100083)  
It is very significant to determine the maturation threshold of primary hydrocarbon generation of source rock for evaluating the resource quantity of natural gas in gas-bearing basin and determining the primary period of hydrocarbon generation.The authors have done some thermal simulating experiments(at 800℃) on fifteen humic coal samples with different maturity and measured the content of hydrogen,carbon and oxygen elements.The result indicates that total hydrocarbon generation of low maturation coal is high,the amount of the hydrocarbon generation reduce gradually with the increase of maturation,when the value of R_(o) is between 0.6% and 2.3%,the decreasing scope of hydrocarbon generation is very large,from 61 m~(3)/t·TOC to 11m~(3)/t·TOC,While the value of R_(o) reach(2.3%,) the hydrocarbon generation is very low,it decrease slowly with the increase of maturation.At the same time,we can see the similar variety rule about the value of H/C with different maturation, when the value of R_(o) is less than(2.3%,) the value of H/C decrease fast with the increase of maturation,the value of H/C reduce slowly.So it can be considered that maturation threshold of kerogen cracking gas generation of humic coal is that the value of R_(o) equal to 2.3%.
【Fund】: 国家973天然气项目(2001CB209102)资助
【CateGory Index】: P618.130.1
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