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煤储层渗透率是影响瓦斯抽采与煤层气开发的重要参数,快速评价不同结构煤体的渗透率对指导现场工作有重要意义。以寺家庄井田为例,为了优选出表征煤储层渗透率的合适方法,通过裂隙分形维数、声波速度和地质强度指标(GSI)对煤体结构进行定量表征,测试其渗透率,依据表征的难易程度和二者拟合系数进行对比。结果表明:裂隙分形维数与渗透率相关性显著,但是操作较为繁琐且不适用于软煤;声波速度法操作简单,但与渗透率关系不明显;地质强度指标与渗透率具有显著的相关性,操作简单,适用于所有煤体结构。因此,寺家庄井田煤储层渗透率表征的最佳方法为地质强度指标法。
Permeability of coal reservoirs is an important parameter that affects gas drainage and CBM development. It is important to evaluate the permeability of coal with different structures rapidly to guide on-site work. Taking Shijiazhuang Minefield as an example, in order to optimize the method of characterizing the permeability of coal reservoir, the structure of coal is quantitatively characterized by fracture fractal dimension, acoustic velocity and geological strength index (GSI), and the permeability is tested. According to the characterization The degree of difficulty and the two fitting coefficients for comparison. The results show that the fracture fractal dimension has significant correlation with permeability, but the operation is cumbersome and not suitable for soft coal. The acoustic velocity method is simple, but the relationship between fractal dimension and permeability is insignificant. There is a significant correlation between geological intensity index and permeability , Simple operation, suitable for all coal structure. Therefore, the best method of permeability characterization of coal reservoir in Shijiazhuang Minefield is the method of geological intensity index.