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天然气地球科学 doi: 10.11764/j.issn.1672-1926.2017.06.007

• 非常规天然气 • 上一篇    下一篇

煤结构演化与生气过程关系研究

陈金明1,2,3，李贤庆1,2，祁帅1,2，高文杰1,2，孙可欣1,2   

  1. 1.中国矿业大学(北京)煤炭资源与安全开采国家重点实验室，北京 100083；
    2.中国矿业大学(北京)地球科学与测绘工程学院，北京 100083；
    3.中国石油勘探开发研究院，北京 100083
  • 收稿日期:2017-03-06 修回日期:2017-05-16 出版日期:2017-06-10 发布日期:2017-06-10
  • 通讯作者: 李贤庆（1967-）,男，浙江富阳人，教授,博士生导师,主要从事煤油气地质,有机地球化学,有机岩石学研究及教学工作. E-mail：lixq@cumtb.edu.cn.
  • 作者简介:陈金明（1991-）,男，安徽安庆人，硕士研究生，主要从事油气地质研究. E-mail：jmc0808@163.com.
  • 基金资助:

    国家自然科学基金项目（编号：41673047；41572125）；国家科技重大专项（编号：2016ZX05007-003）联合资助.

Study on the relationship between chemical structure evolution and gas generation of coal

Chen Jin-ming1,2,3，Li Xian-qing1,2，Qi Shuai1,2，Gao Wen-jie1,2，Sun Ke-xin1,2   

  1. 1.State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology(Beijing),Beijing
    100083,China;2.College of Geoscience and Surveying Engineering,China University of Mining and Technology(Beijing),
    Beijing
    100083,China;3.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China
  • Received:2017-03-06 Revised:2017-05-16 Online:2017-06-10 Published:2017-06-10

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摘要：

利用傅里叶红外光谱分析技术对煤化程度（RO）范围为0.35%~5.32%的19个煤样进行了结构分析。分析结果表明：随着RO值的增加，煤结构中不同的官能团具有不同的演化规律。芳环结构中C-H键在红外谱图中先增加，当RO>3.0%后逐渐减小。含氧侧链与脂肪族侧链随着RO值增加，吸收峰强度总体呈减弱的趋势。含氧官能团的含量在逐渐的减少，RO>2.5%时，煤结构中基本不再含有含氧侧链；脂肪族侧链RO<2.0%时，脂肪侧链随着煤化程度的增加快速减少，RO>2.0%时脂肪族侧链在煤结构中缓慢减少，当RO>2.5%时，在煤结构中检测到的脂肪侧链已经很少。煤结构的上述演化规律预示着煤在不同的演化阶段具有不同的生气特征。RO<0.8%含氧侧链在煤结构的快速减少说明CO2气的生成主要发生在相对低的演化阶段；脂肪侧链两段式的演化规律说明煤的主要生气（烃类气体）阶段发生在RO<2.0%，而煤生气结束的煤化程度界限为RO>5.0%。煤在石墨化过程中从芳环上脱落的氢与煤在演化阶段生成的CO2之间发生的费_托反应可能是过成熟阶段煤成气碳同位素倒转（反转）的一个重要因素。

关键词: 煤化学结构, 傅里叶红外技术, 生气机理, 生气结束界限

Abstract:

The chemical structure of 19 samples with maturities ranging from  0.35% to  5.32% RO was measured by Fourier transform infrared spectroscopy(FTIR).The results show that with the increase of RO,different functional groups in coal structure have different evolution rules.The C-H bond on the aromatic ring structure increases first,when RO>2.5%,decreases in the infrared spectrum. With the increase of RO,the overall trend of absorption peaks intensity of the oxygen side chain and aliphatic side chain weakened.The content of oxygen-containing functional groups decreased gradually.When RO>2.5%,the coal structure basically no longer contains oxygen side chain;When RO<2.0%,the aliphatic side chain increased rapidly with increasing coalification;when RO>2.0%,the aliphatic side chain in the coal structure slowly reduced;when RO>2.5%,nearly no fat side chain was detected in the  coal structure.This demonstrates that coal has different gas generation features at different stages.The rapid reduction of coal content in the oxygen-containing side chain indicates that the formation of CO2 gas mainly occurs in the relatively low evolution stage.The two-stage evolution aliphatic groups indicated that the main gas generation period of coal was at the stage with thermal maturity <2.0%RO,however,the upper limit of thermal maturity for gas generation from coal was >5.0%RO.The Fischer-Tropsch reaction,which happened between hydrogen atom cleaved from aromatic rings at graphitization(RO>3.0%) and CO2 gengerated by oxygen-containing groups cleavage from coal at RO<2.0%,should be one of the important reasons causing carbon isotopic reversal of coal derived gases at over maturity.

Key words: Coal chemical structure, Fourier transform infrared spectroscopy(FTIR), Mechanism of gas generation, Upper thermal maturity limit

中图分类号: 

  • TE132.2

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