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Geochemical Characteristics and Generation Process of Mixed Biogenic and Thermogenic Coalbed Methane in Luling Coalfield, China

机译:芦岭煤田生热混合煤层气的地球化学特征及生成过程

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摘要

The exploration and development of coalbed methane (CBM) is often associated with the thermogenic gas. Because the mixed CBM derived from thermogenic and secondary biogenic gases was discovered in many coal-bearing basins of the world, secondary biogenic CBM which makes a significant contribution to the gas content is becoming a hot topic. In the present study, the origin of the gas in the Luling coalfield of China was first identified through molecular and stable isotope testing. Then, based on the basin evolution history, the generation process of thermogenic CBM and mixed CBM from biogenic and thermogenic gases was analyzed using two calculations. The results show that the carbon isotopic ratios of methane and carbon dioxide in Luling coalfield range from -67.6‰ to - 50.5‰ and from -12.6‰ to -8.7‰, respectively, and the hydrogen isotopic ratios of methane range from - 228‰ to - 206‰. The isotope data indicate that the CBM in the Luling coalfield consists of both biogenic and thermogenic gases. Moreover, the generation process of mixed CBM can be divided into three stages: primary biogenic gas, thermogenic gas, and secondary biogenic gas. Cap outburst dissipation was determined to be the main migration mechanisms of hybrid CBM in Luling coalfiled, whereas diffusion was along with the whole process of CBM generation. Various factors, including maturity, temperature, and the time required for allochthonous methanogenic bacteria to move through the coal bed, were discussed in affecting the generation of secondary biogenic gas. These factors control the quantity, rate, and start and end of secondary biogenic CBM generation, respectively.
机译:煤层气(CBM)的勘探和开发通常与产热气体有关。由于在世界上许多含煤盆地中发现了源自热成因气体和第二生物成因气体的混合煤层气,对气体含量做出重大贡献的第二生物成因煤层气成为一个热门话题。在本研究中,首先通过分子和稳定同位素测试确定了中国the陵煤田的天然气成因。然后,根据盆地演化历史,利用两次计算,分析了生物气和热气中的热源煤层气和混合煤层气的生成过程。结果表明,鹿岭煤田甲烷和二氧化碳的碳同位素比分别为-67.6‰至-50.5‰和-12.6‰至-8.7‰,甲烷的氢同位素比为-228‰至-228‰。 -206‰。同位素数据表明,ling陵煤田的煤层气由生物气和热气组成。此外,混合煤层气的生成过程可分为三个阶段:一次生气,生热气和二次生气。顶板消散被确定为Lu陵煤田混合煤层气的主要运移机制,而扩散则与煤层气生成的全过程一致。讨论了影响次生生物气生成的各种因素,包括成熟度,温度和异源产甲烷细菌穿过煤层所需的时间。这些因素分别控制了第二代生物成因煤层气生成的数量,速率以及开始和结束。

著录项

  • 来源
    《Energy & fuels》 |2014年第julaaauga期|4392-4401|共10页
  • 作者单位

    Key Laboratory of Computational Geodynamics of Chinese Academy Sciences, College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China,Key Laboratory of CBM Resource and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China,College of Earth Science, University of Chinese Academy of Sciences, 19 A Yuquan Road, Beijing, China;

    Key Laboratory of CBM Resource and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China,These authors contributed equally. The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript;

    Key Laboratory of CBM Resource and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China,These authors contributed equally. The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript;

    Key Laboratory of Computational Geodynamics of Chinese Academy Sciences, College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China,These authors contributed equally. The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript;

    Key Laboratory of Computational Geodynamics of Chinese Academy Sciences, College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China,These authors contributed equally. The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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