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An NMR Study of the Ratio between Free and Sorbed Methane in the Pores of Fossil Coals

机译：化石煤孔隙中游离甲烷与吸附甲烷之比的NMR研究

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摘要

Theoretical and experimental data on the concentrations of methane in different phase states in the porous structure of coals from the Donets Basin are reported. On the saturation of coal samples with methane, the natural conditions of the occurrence of methane in coal beds were simulated for the equilibrium coal-gas system. The amounts of methane dissolved in a solid matrix and adsorbed on the pore surfaces of coal matter were measured by broad-band NMR spectroscopy. The values obtained did not exceed 20% of the total methane absorbed by the sample in an equilibrium state at a pressure of 10 MPa. Sorbed methane was the predominant phase state only upon the opening of a high-pressure chamber after the emission of methane from filtration channels.
机译：报道了顿涅茨盆地煤多孔结构中不同相态甲烷浓度的理论和实验数据。在煤样含甲烷饱和的情况下，模拟了平衡煤气系统中煤层中甲烷生成的自然条件。通过宽带NMR光谱法测量溶解在固体基质中并吸附在煤物质的孔表面上的甲烷的量。所获得的值不超过在10 MPa压力下处于平衡状态的样品吸收的甲烷总量的20％。从过滤通道排放甲烷后，只有在打开高压室后，吸附的甲烷才是主要的相态。

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