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    森林沼泽泥炭不同演化阶段气体碳氢同位素演化特征

    段毅 吴应忠 姚泾利 刘显阳 孙涛 何金先 徐丽 夏嘉 张晓丽

    段毅, 吴应忠, 姚泾利, 刘显阳, 孙涛, 何金先, 徐丽, 夏嘉, 张晓丽, 2013. 森林沼泽泥炭不同演化阶段气体碳氢同位素演化特征. 地球科学, 38(1): 87-93. doi: 10.3799/dqkx.2013.008
    引用本文: 段毅, 吴应忠, 姚泾利, 刘显阳, 孙涛, 何金先, 徐丽, 夏嘉, 张晓丽, 2013. 森林沼泽泥炭不同演化阶段气体碳氢同位素演化特征. 地球科学, 38(1): 87-93. doi: 10.3799/dqkx.2013.008
    DUAN Yi, WU Ying-zhong, YAO Jing-li, LIU Xian-yang, SUN Tao, HE Jin-xian, XU Li, XIA Jia, ZHANG Xiao-li, 2013. Carbon and Hydrogen Isotopic Compositions and Their Evolutions of Gases Generated by Forest Marsh Peat at Different Thermal Maturity Stages. Earth Science, 38(1): 87-93. doi: 10.3799/dqkx.2013.008
    Citation: DUAN Yi, WU Ying-zhong, YAO Jing-li, LIU Xian-yang, SUN Tao, HE Jin-xian, XU Li, XIA Jia, ZHANG Xiao-li, 2013. Carbon and Hydrogen Isotopic Compositions and Their Evolutions of Gases Generated by Forest Marsh Peat at Different Thermal Maturity Stages. Earth Science, 38(1): 87-93. doi: 10.3799/dqkx.2013.008

    森林沼泽泥炭不同演化阶段气体碳氢同位素演化特征

    doi: 10.3799/dqkx.2013.008
    基金项目: 

    国家自然科学基金 40872092

    国家自然科学基金 41272125

    国家自然科学基金 40772069

    国家"973"项目 2005CB422105

    详细信息
      作者简介:

      段毅(1956-), 男, 博士生导师, 研究员, 主要从事油气地球化学和有机地球化学研究及教学工作.E-mail: duany@lzb.ac.cn

    • 中图分类号: P593

    Carbon and Hydrogen Isotopic Compositions and Their Evolutions of Gases Generated by Forest Marsh Peat at Different Thermal Maturity Stages

    • 摘要: 煤层气的成因是石油地质学研究的热点.煤层气聚集存在着"累积聚气"和"阶段聚气"两种形式, 对于"阶段聚气" 的煤层气成因判识的地球化学研究还很薄弱.通过森林沼泽泥炭在不同温度下制备的样品进行热模拟实验, 首次获得了不同演化阶段甲烷、乙烷和二氧化碳的碳、氢同位素组成和演化规律.发现随着原始样品演化程度越高, 生成的甲烷和乙烷的碳、氢同位素组成具有变重的趋势; 同时, 甲烷和乙烷碳同位素组成明显地受原始样品演化程度的影响, 而氢同位素组成主要与成熟度密切相关.确定了成煤有机质在不同演化阶段生成的气体碳、氢同位素组成.首次获得了成煤有机质不同演化阶段热解气体碳、氢同位素组成与Ro之间的关系式.建立了甲烷与乙烷的碳、氢同位素之间的关系式, 形成了甲烷碳、氢同位素组成相关图.根据这些为研究不同成熟度区间生成的煤层气成因提供了科学数据, 为"阶段聚气"的煤层气地球化学特征认识及其成因判识提供了科学依据.并且, 将这些研究结果应用到我国沁水盆地南部煤层气研究, 认为该地区煤层气是在中侏罗世以后聚集而成, 具有"阶段聚气"的特征, 证明了热模拟研究成果对自然界煤层气成因的判识具有重要的科学意义.

       

    • 图  1  甲烷(a)、乙烷(b)和二氧化碳(c) 的δ13C值与热解温度的关系

      Fig.  1.  δ13C of CH4 (a), C2H6 (b) and CO2 (c) vs. pyrolysis temperature

      图  2  甲烷(a)和乙烷(b)的δD值与热解温度的关系

      Fig.  2.  δD of CH4 (a) and C2H6 (b) vs. pyrolysis temperature

      图  3  甲烷(a)、乙烷(b)的δ13C与Ro值的关系

      Fig.  3.  δ13C of CH4 (a) and C2H6 (b) vs. Ro

      图  4  甲烷(a)和乙烷(b)的δD与Ro值的关系

      Fig.  4.  δD of CH4 (a) and C2H6 (b) vs. Ro

      图  5  甲烷δD与δ13C值的关系

      Fig.  5.  δD vs. δ13C of CH4

      图  6  甲烷与乙烷δ13C值(a)和甲烷与乙烷δD值(b)相关图

      Fig.  6.  δ13C of CH4 vs. C2H6 (a) and δD of CH4 vs. C2H6 (b)

      表  1  不同Ro区间生成的甲烷、乙烷和二氧化碳平均δ13C与δD值

      Table  1.   Average δ13C and δD of methane, ethane and CO2 generated from peat of different Ro intervals

      样品 Ro(%) δ13CCH4 δDCH4 δ13CCO2 δ13CC2H6 δ13CC3H8 δDC2H6
      250~650 ℃(C3t) 0.8~4.8 -34.7 -223 -20.1 -29.6 -26.7 -203.5
      300~650 ℃(C3t) 1.1~4.8 -33.1 -208 -19.2 -28.5 -24.8 -196.8
      350~650 ℃(C3t) 1.9~4.8 -30.7 -189 -19.0 -24.3 -23.9 -152.3
      400~650 ℃(C3t) 2.3~4.8 -26.4 -167 -14.7 -15.6 -125.0
      450~600 ℃(C3t) 3.1~4.2 -26.4 -167 -17.3
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    • 收稿日期:  2012-09-28
    • 刊出日期:  2013-01-15

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