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

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  • 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 date: 2014-06-17

  Revised date: 2014-09-11

  Online published: 2015-05-10

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,Ⅱ 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.

Cite this article

WANG Zhi-rong,CHEN Ling-xia,HAN Zhong-yang,CHEN Ping . Accumulation Mechanism of  Coalbed Methane Based on 13C NMRSpectrum and Its Gas-controlling Significance[J]. Natural Gas Geoscience, 2015 , 26(5) : 958 -965 . DOI: 10.11764/j.issn.1672-1926.2015.05.0958

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