沁水盆地寺河煤矿煤岩吸附甲烷规律实验研究

煤储层具有大量的裂隙和孔隙，使煤岩具有很大的比表面积，为煤中甲烷的吸附提供了必要条件。采用自主研发的煤层气吸附装置，通过对沁水盆地寺河煤矿不同粒径煤粉的吸附性模拟实验，总结了不同粒径煤粉在吸附甲烷12 h内的吸附规律，计算出其中吸附气量，研究了吸附速率、吸附量的变化规律。研究认为：吸附的前10 min，吸附量占总吸附量的40%~60%，煤粉粒径越小，所占的比例越大，吸附越快；不同粒径煤粉的吸附量为15.1~29.1 mL/g，煤粉粒径越小，单位质量煤粉吸附量越大。通过对煤岩吸附规律的深入研究，为沁水盆地煤层气的勘探开发提供技术支持。

Experimental study on methane adsorption of coal bed from Sihe Mine in Qinshui Basin

Due to abundant racks and pores, coal bed has a huge specific surface area which provides the necessary conditions for the adsorption of methane in coal. A case study was made in the Sihe Mine in the Qinshui Basin. Using the self-developed CBM adsorption experiment instrument, the absorption rules (including rate and amount) within 12 h of methane in coal of different sizes were studied. The absorption amount during the prior 10 minutes accounts for 40%-60% of total absorption amount. Moreover, the smaller the coal particle is, the bigger proportion the small particle accounts for, the faster the methane is absorbed. The adsorption capacities for different coal sizes range from 15.1 to 33.6 mL/g. The smaller the coal particle is, the more methane is absorbed in coal per unit. The study of the adsorption law of coal bed provides technological supports for the exploration and development of the Qinshui Basin.