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Porosity type analysis and permeability model for micro-trans-pores, meso-macro-pores and cleats of coal samples

机译:煤样的微贯孔,中观宏孔和割理的孔隙度类型分析和渗透率模型

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Porosity and permeability interact strongly, and the former describes the pore space for fluid storage, whereas the latter is used to describe the ability of fluid to migrate through the rock. Coal pore systems can be commonly classified as micro-trans-pores, meso-macro-pores and cleats, which indicates that the interactions between permeability and porosity in each pore system should be diverse. To investigate this diversity, measurements of nuclear magnetic resonance and routine core analysis are conducted for fifteen coal samples collected from underground mines in China. Then, the total porosity, movable porosity and unmovable porosity of each pore system are calculated, and the scatter diagrams of the three types of porosity versus air permeability are plotted. The results indicate that air permeability is influenced by both movable meso-macro-pore porosity and movable cleat porosity, and is weakly affected by the unmovable porosity of each pore system. According to the relative values of movable meso-macro-pore porosity and movable cleat porosity, coal samples are classified as cleat dominated permeability samples, meso-macro-pore dominated permeability samples, and combined effect samples. The former two types of samples can be used to establish models of cleat permeability and matrix permeability, respectively, based on the modified matchstick and Coates models. (C) 2015 Elsevier B.V. All rights reserved.
机译:孔隙度和渗透率相互作用很强,前者描述了流体储存的孔隙空间,而后者则描述了流体在岩石中迁移的能力。煤孔系统通常可以分为微透孔,中微孔和夹层,这表明每个孔系统中渗透率和孔隙度之间的相互作用应该是多样的。为了研究这种多样性,对从中国地下煤矿采集的15个煤样品进行了核磁共振测量和常规岩心分析。然后,计算每个孔隙系统的总孔隙率,可移动孔隙率和不可移动孔隙率,并绘制三种孔隙率与透气率的散点图。结果表明,透气性受可移动的中微孔孔隙度和可移动的楔形孔隙度的影响,而受到每个孔隙系统不可移动孔隙度的弱影响。根据可移动的中微孔孔隙度和可移动的夹层孔隙度的相对值,将煤样品分类为以夹层为主导的渗透率样品,中-大孔为主导的渗透率样品和组合效应样品。基于修改后的火柴棍和Coates模型,前两种类型的样本可分别用于建立防滑钉渗透率和基质渗透率模型。 (C)2015 Elsevier B.V.保留所有权利。

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