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煤层甲烷在煤储层中的储集及渗流与常规天然气大不相同，其影响因素多样而复杂。 影响煤层气产量的主要因素是煤层渗透率、煤层厚度及含气量。大量煤层气井生产实践证明，含气量是影响产量的物质基础，而渗透率是影响产量大小的控制性因素。煤层含气量与煤层厚度及埋深一般有正相关关系，而渗透率一般随埋深增加而减小。用产气潜能与产气能力将更全面地反映含气量及渗透率对煤层气井产量的影响。把含气量引入达西流产量公式也许能更真实地反映甲烷气体在煤储层中流动产出的特征。

Factors of Influencing Production of Coal-bed Gas Wells

Accumulation and percolation of coal-bed methane in coal measure strata is very different from that of average natural gas. The factors of influencing accumulation and percolation of coal-bed methane are various and complex. The main factors of influencing coal-bed gas production are permeability, thickness, and gas-bearing volume of the coal-bed. Many real cases of coal-bed gas wells prove that the gas-bearing volume is the material basis to influence production and the permeability is the dominant factor to influence production. The gas-bearing volume and thickness of the coal-beds are positively correlative with their buried depth. But permeability usually decreases as the buried depth increases. With gas potential and gas productivity the influence of gas-bearing volume and permeability on production of coal-bed gas wells will be reflected completely. And Darcy flow production equation with gas-bearing volume may reflect the characteristics of methane migration in coal measure strata more really.