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天然气地球科学

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基于13C NMR谱的煤层气应力成藏作用机理及控气意义

王志荣，陈玲霞，韩中阳，陈平   

  1. 1.郑州大学水利与环境学院，河南 郑州 450001；2.郑煤集团煤质监测中心，河南 郑州 452371
  • 收稿日期:2014-06-17 修回日期:2014-09-11 出版日期:2015-05-10 发布日期:2015-05-10
  • 作者简介:王志荣(1963-)，男，浙江嘉善人，教授，博士，主要从事地质工程与地质灾害防治研究. E-mail:wangzhirong513@sina.com.
  • 基金资助:

    国家自然科学基金项目(编号:41272339)资助.

Accumulation Mechanism of  Coalbed Methane Based on 13C NMRSpectrum and Its Gas-controlling Significance

WANG Zhi-rong，CHEN Ling-xia，HAN Zhong-yang，CHEN Ping   

  1. 1.School of Water Conservancy and Environment Engineering,Zhengzhou University,Zhengzhou 450001,China;
    2.Centre of coal quality detection of Group Limited Company of Zhengzhou Mining,Zhengzhou 452371,China
  • Received:2014-06-17 Revised:2014-09-11 Online:2015-05-10 Published:2015-05-10

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摘要：

构造应力是促进煤化作用，从而也是影响煤层气生成的主要因素。为了探索浅层脆性条件下，不同类型构造应力对煤层气形成的影响机理和控藏意义，利用豫西煤田重力滑动构造典型的应力分区特性，在挤压、拉伸和剪切3个构造变形单元内，分别采集主采二1煤样并测定核磁共振吸收强度。测试结果表明，挤压、拉伸和剪切3个构造单元内煤样的芳碳率依次减小，数值分别是0.773、 0.730、0.702,而脂碳率依次增加,数值分别是0.138、0.167、0.182，各官能团的相对含量亦随应力分区的不同呈现相应的变化。此外，羧基碳含量依次是0.061、0.042、0.082，羰基碳含量依次是0.053、0.030、0.016。上述NMR结构参数佐证，低温条件下构造应力仍然是重要的煤化作用因素，但不同性质的构造应力，其控制作用程度则有所不同。各向异性挤压应力的作用机制相对强烈，对煤层气成藏进程具有较大的促进作用|拉伸应力的煤化作用仅次于挤压应力；由浅层滑动作用引起的剪切应力对煤层气产生的促进作用相对最小。研究成果对煤矿安全生产和煤层气的综合开采利用具有一定理论意义。

关键词: 构造应力, 控藏意义, 核磁共振, 煤层气成藏进程

Abstract:

Tectonic stress is a main influence factor of coalification and coalbed methane(CBM) formation.In order to study the effect and reservoir-controlling significance of different tectonic stress on CBM formation under shallow brittle deformation condition,ⅡⅠ coal samples were collected from tectonic deformation zones induced by compressive,tensile and shear stress according to the typical partitioning features of gravity sliding structure in Western Henan coalfield,and then the nuclear magnetic resonance(NMR) absorption intensity of samples were measured.The results show that the aromatic carbon rate of the three zones decreases successively with values of 0.773,0.730,0.702,while the aliphatic carbon rate increases with values of 0.138,0.167,0.182,and the relative content of each functional group in different zones also changes correspondingly.In addition,the content ratio of carboxyl is 0.061,0.042,0.082,and that of carbonyl is 0.053,0.030,0.016.The NMR structure parameters indicate that tectonic stress is still an important factor of coalification under low temperature,but the effect degree of different stress is different.The action mechanism of anisotropic extrusion stress is complex,and has great promotion in CBM formation|the promotion effect of tensile stress is after extrusion stress,while the promotion effect of shear stress caused by shallow sliding is relatively minimal.The conclusions have some theoretical significance to coal mine safety production and CBM comprehensive exploitation.

Key words: Tectonic stress, Reservoir-controlling significance, Nuclear magnetic resonance, CBM formation

中图分类号: 

  • TE122.3
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