煤层气运移特征的研究

STUDY ON THE MOVEMENT PROPERTY OF COAL SEAM METHANE

煤层气在煤层中的流动是孔隙中扩散和裂隙中渗流的综合过程，研究二者之间的质交换关系，对开发低透气性煤层的煤层气具有指导意义．首次依据第三类边界传质的原理，建立了扩散渗流的微分方程组，重点讨论了反映煤层气扩散渗流特征参数的测试原理，实测了某煤层的特征参数．

The coal bed methane flow is a complex process including the diffusion in micropores and permeation in macropores.To study mass exchange relation between them is of important significance to exploit low permeability methane in coal seam.According to mass transfer principle under the third kind boundary condition differential equations are established firstly.The theory of measuring the proper parameters of diffusion and permeation is discussed emphatically. And the parameters of a coal seam are measured by using the theory.