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首页> 美国卫生研究院文献>The Scientific World Journal >Permeability Prediction in Deep Coal Seam: A Case Study on the No. 3 Coal Seam of the Southern Qinshui Basin in China
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Permeability Prediction in Deep Coal Seam: A Case Study on the No. 3 Coal Seam of the Southern Qinshui Basin in China

机译：深部煤层渗透率预测-以沁水盆地南部三号煤层为例

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摘要

The coal permeability is an important parameter in mine methane control and coal bed methane (CBM) exploitation, which determines the practicability of methane extraction. Permeability prediction in deep coal seam plays a significant role in evaluating the practicability of CBM exploitation. The coal permeability depends on the coal fractures controlled by strata stress, gas pressure, and strata temperature which change with depth. The effect of the strata stress, gas pressure, and strata temperature on the coal (the coal matrix and fracture) under triaxial stress and strain conditions was studied. Then we got the change of coal porosity with strata stress, gas pressure, and strata temperature and established a coal permeability model under tri-axial stress and strain conditions. The permeability of the No. 3 coal seam of the Southern Qinshui Basin in China was predicted, which is consistent with that tested in the field. The effect of the sorption swelling on porosity (permeability) firstly increases rapidly and then slowly with the increase of depth. However, the effect of thermal expansion and effective stress compression on porosity (permeability) increases linearly with the increase of depth. The most effective way to improve the permeability in exploiting CBM or extracting methane is to reduce the effective stress.
机译：煤的渗透率是控制矿井瓦斯和煤层气开发的重要参数，它决定了瓦斯抽采的实用性。深层煤层的渗透率预测在评价煤层气开采可行性方面起着重要作用。煤的渗透率取决于受地层应力，瓦斯压力和地层温度控制的煤裂缝，深度随深度而变化。研究了在三轴应力和应变条件下地层应力，气压和地层温度对煤（煤基质和裂缝）的影响。然后得到了煤孔隙度随地层应力，气压和地层温度的变化，并建立了三轴应力和应变条件下的煤渗透率模型。预测了中国南部沁水盆地3号煤层的渗透率，这与现场测试的结果一致。吸附膨胀对孔隙率（渗透率）的影响首先随着深度的增加而迅速增加，然后缓慢增加。但是，热膨胀和有效应力压缩对孔隙率（渗透率）的影响随深度的增加而线性增加。提高开采煤层气或提取甲烷的渗透率的最有效方法是降低有效应力。

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