EFFECTS OF CONSTANT TEMPERATURE TIME ON THE PYROLYSATE OF THE LOWMATURATION COAL SAMPLED FROM SHENSHAN COAL MINE, ORDOS BASIN
Received date: 2006-08-04
Revised date: 2006-12-12
Online published: 2008-06-20
The low maturation coal in Shenshan Coal Mine, as the immature sample of the Carboniferous Benxi Formation, Ordos basin, is pyrolyzed under three different conditions in semi-open systems to identify the major source rocks of the natural gas in the Upper Ordovician weathered crust. We heated the sample rapidly up to acertain temperature point, and then cooled it immediately or cooled it after keping the temperature for 120 minutes to temperatures below 100 ℃, separately. Then the sample was heated to higher temperatures and the procedure was repeated The results show that the sample does not react entirely at each temperature under the first condition. Since reactants in the sample can only react partially during each heating process, the methane collected at higher temperatures is the mixture of the methane generated at lower and higher temperatures. In this case, the mechanism of the methane generation is like the hydrocarbon generation inclosed systems. Under the second condition, reactants in the sample react entirely, so the methane collected at higher temperatures is generated only at the higher temperatures. The mechanism of the methane generation is like that in open systems. Under the two different isothermal conditions, the amounts of ethane, propane, butane, pentane are much less than that of methane, so their reactants have reacted entirely at each temperature. Thus, the ethane, propane, butane and pentane collected at higher temperatures are only generated at higher temperatures. The mechanism of their generation from the sample is like that in open systems.
WU Tian-hong,GUAN Ping . EFFECTS OF CONSTANT TEMPERATURE TIME ON THE PYROLYSATE OF THE LOWMATURATION COAL SAMPLED FROM SHENSHAN COAL MINE, ORDOS BASIN[J]. Natural Gas Geoscience, 2007 , 18(1) : 93 -98 . DOI: 10.11764/j.issn.1672-1926.2007.01.93
[ 1 ] 谢增业,蒋助生,张英,等.全岩热模拟新方法在气源岩评价中的应 用.第八届全国有机地球化学学术会议论文集——有机地球化学研究新进展 [C ]//梁狄刚,黄第 藩.北京:石油工业出版社,2002:245-250.
[2] 卢双舫.有机质成烃动力学原理及其应用 [M ].北京:石油工业出版社,1996 .
[3] 关平.甲烷碳同位素分布数理模型的探讨 [J ].科学通报,1998,43: 576-578.
[ 4 ] 刘金钟,唐永春.用干酪根生烃动力学方法预测甲烷生成量之一例 [J ].科学 通报,1998,43(11):1187-1191.
[ 5 ] 米敬奎,李新虎,刘新华,等.利用生烃动力学研究鄂尔多斯盆地抬升后上古 生界源岩生气作用结束时间 [J ].地球化学,2004,33(6):561-567.
[ 6 ] 付绍英,彭平安,张文正等,.鄂尔多斯盆地上古生界煤的生烃动力学研究 [ J ].中国科学:D辑,2002,32(10):812-819.
[ 7 ] 帅燕华,邹艳荣,彭平安.塔里木盆地车坳陷煤成气甲烷碳同位素动力学研究 及其成藏意义 [J ].地质化学,2003,32(5):469-475.
[ 8 ] Andresen B, Throndsen T, Rahemi A, et al. A compari son of pyrolysis products with models for natural gas generation [J ]. Chemical Geology, 1995, 126: 261-280.
[9 ] Behar F. Artificial coalification of a fossil wood from brown coal by confined system pyrolysis [J ].Energy & Fuels, 1995, 9:984-994.
[10 ] Behar F, Tang Y, Liu J. Comparison of rate constants for some molecular tracers generated during artificial maturation of kerogens: influence of keroge n type [J ]. Org Geochem, 1997b,25(3/4):281-287.
[11 ] Behar F, Vandenbroucke M, Tang Y, et al. Thermal cracking of kerogen in open and closed systems: determination of kinetic parameters and stoichiomet ric coefficients for oil and gas generation [J ]. Org Geochem,1997a,26(5/6):321-339.
[12 ] Behar F, Vandenbroucke M, Teermann S C, et al. Experimenta l simulation of gas generation from coals and a marine kerogen [J ]. Chemical Ge ology,1995, 126:247-260.
[13 ] Berner U, Faber E, Stahl W J. Mathematical simulation of the carbon isot opic fractionation coals and related methane [J ]. ChemicalGeology, 1992, 94:315 -319.
[14 ] Berner U, Faber E, Scheeder G, et al. Primary cracking of alga l and landplant kerogens; kinetic models of isotope variations in methane, ethan e and propane [G ]//Rice D D, Schoell M. Processes of natural gas formation. Che mical Geology, 1995, 126(3-4):233-245.
[15 ] Cramer B, Krooss B M, Littke R. Modelling isotope fractionatio n during primary cracking of natural gas: a reaction kin- etic approach[J ]. Chemical Geology, 1998, 149(3-4):235-250.
/
〈 |
|
〉 |