| 亨利定律在煤层气组分溶解分馏中的应用 |
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| 引用本文： | 陈润,苏现波,林晓英.亨利定律在煤层气组分溶解分馏中的应用[J].煤田地质与勘探,2007,35(2):31-33. |
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| 作者姓名： | 陈润 苏现波 林晓英 |
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| 作者单位： | 河南理工大学资源环境学院,河南,焦作,454003 |
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| 摘 要： | 亨利定律的引入,使煤层气在溶解过程中发生的组分分馏得以合理解释,为煤层气的富集成藏研究提供了信息。采用半经验公式计算CH4(甲烷)和CO2(二氧化碳)的亨利常数,根据逸度因子公式求取CH4和CO2的逸度,根据亨利定律计算出不同埋深下CH4和CO2在地层水中的溶解度。结果表明:CH4溶解度随埋深的增加而增加;CO2的溶解度则随埋深的增加而先增加后(在800 m深度以下)又减小,但CO2与CH4溶解度比率却在不断减小。这就意味着浅部CO2的溶解运移分馏更为活跃,它随深度的增加逐渐减弱。这一认识为圈定煤层气富集区和确定CO2注入(以驱使CH4产出)的最佳温压环境提供了理论依据。
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| 关 键 词： | 亨利定律 煤层气组分 溶解分馏 逸度 |
| 文章编号： | 1001-1986(2007)02-0031-03 |
| 修稿时间： | 2006年10月26 |
Application of Henry Law in solution fractionation of multi-composition coalbed gas |
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| CHEN Run,SU Xian-bo,LIN Xiao-ying.Application of Henry Law in solution fractionation of multi-composition coalbed gas[J].Coal Geology & Exploration,2007,35(2):31-33. |
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| Authors: | CHEN Run SU Xian-bo LIN Xiao-ying |
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| Abstract: | The mechanism of multi-composition coalbed gas fractionation during the process of solution can be interpreted by Henry Law.This mechanism is a guide for the investigation of coalbed gas accumulation.Henry's constants of methane and carbon dioxide can be calculated by the experience formula,and the fugacity can be calculated by fugacity gene formula,based on Henry Law,the soluble mole fractions of carbon dioxide and methane in groundwater with burial depth increasing were calculated.The result indicates that methane solubility increased with burial depth increasing,and carbon dioxide solubility increased at beginning and then decreased with burial depth increasing(critical depth of 800 m);but the solubility rate(cCO2/cCH4) decreased with burial depth increasing.This means that carbon dioxide soluble fractionation is stronger at shallow depth,and it becomes weaker with burial depth increasing.This mechanism can ascertain the coalbed gas accumulation,and can provide a theoretical foundation for ascertaining the optimal condition of injection carbon dioxide to enhance methane production. |
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| Keywords: | Henry Law coalbed gas composition solution fractionation fugacity |
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