海拉尔盆地呼和湖凹陷低阶煤孔隙分形特征研究
Fractal characteristics of pore of low-rank coal in Huhehu Sag in Hailar Basin
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摘要: 为研究有利于煤层气勘探开发的煤储层孔隙结构特征，运用孔隙分形研究方法，探究了海拉尔盆地呼和湖凹陷低阶煤中分形维数与孔径分布、镜质组反射率、兰氏体积与兰氏压力之间的关系。研究表明：海拉尔盆地呼和湖地区低阶煤在不同孔径段内的孔隙具有明显的分形特征，FHH模型计算的分形维数更符合呼和湖地区低阶煤孔隙特征；FHH中不同宏观煤岩类型在相对压力0~0.5和0.5~1.0吸附特征各异得到分维数D1和D2，其中D1表征煤吸附孔表面粗糙度，而D2表征吸附孔结构不规则性；D2越高，BET比表面积积越大，微孔含量越高，平均孔直径越小；分形维数D1和D2都可以反映呼和湖地区低阶煤的吸附性能，D1相较D2对煤岩吸附性能的控制作用更大。Abstract: In order to investigate the pore structure characteristics of coal reservoir which is in favor of the coalbed methane exploration and development, we explored the relationship between fractal dimension and pore diameter distribution, vitriolic reflectance, Langmuir volume and Langmuir pressure in low rank coal in Huhehu area of Hailar Basin. The results showed that the pores of low rank coal in Huhehu area of Hailar Basin have obvious fractal characteristics in different pore sizes. Compared with BET model, the fractal of FHH model is more consistent with the pore characteristics of low rank coal in Huhehu area. In FHH model, the adsorption characteristics of different macroscopic coal rock types are different at the relative pressure of 0 to 0.5 and 0.5 to 1.0, and the fractal dimensions D1 and D2 are obtained, where D1 represents the surface roughness of coal adsorption pore and D2 represents the irregularity of adsorption pore structure. The higher D2 is, the bigger the BET specific surface area product is, the higher the micropore content is, and the smaller the average pore diameter is. Both the fractal dimension D1 and D2 can reflect the adsorption performance of low rank coal in Huhehu area, and D1 phase plays a greater role in controlling the adsorption performance than D2.
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