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以扩散传质微分方程为基础,建立游离甲烷在盖层中扩散散失的数学模型,并对不同地质条件进行模拟计算。结果表明扩散作用是游离态煤层甲烷散失的重要途径之一,扩散散失速度与储、盖层特征、煤层有机质热成熟历史等有关;烃浓度封闭对阻滞煤层甲烷的扩散散失起了重要的作用。
Based on the diffusion mass differential equation, a mathematical model of diffusion and dissipation of free methane in the caprock is established, and different geological conditions are simulated. The results show that diffusion is one of the important ways to dissipate methane in the free-flowing coal seam. The rate of diffusion and loss is related to the characteristics of reservoirs and cap rocks and the thermal maturation history of the organic matter in the coal seam. The closed hydrocarbon concentration plays an important role in retarding the diffusion and loss of methane in the coal seam.