Fluid flow in rocks has a key role in many geological processes, such as in geothermal reservoirs and crustal deformation. Permeability is known to be dependent on porosity and flow path aperture, but direct quantification of pore structures is more difficult than direct estimation of permeability. The gas breakthrough method can be used to determine the radius of transport pores by using the gas pressure at which gas breaks through a water-saturated sample ( ). In this study, we applied the gas breakthrough method under confining pressure to damaged granite, in order to evaluate the relationship between permeability and pore characteristics (i.e., porosity and transport flow path aperture) at pressures up to 30 MPa. The transport flow path aperture, permeability, and porosity of thermally cracked granite decrease with increasing confining pressure. We quantified the relationship between permeability and pore characteristics, which provides a better estimation of permeability by taking into account the fraction of hydraulically connected cracks.

中文翻译：

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热裂花岗岩输运流道孔径的实验测量及孔隙结构与渗透率的关系

岩石中的流体流动在许多地质过程中起着关键作用，例如在地热储层和地壳变形中。众所周知，渗透率取决于孔隙率和流路孔径，但孔结构的直接量化比渗透率的直接估计更困难。气体穿透法可用于通过使用气体突破水饱和样品时的气压来确定输运孔的半径 ( )。在这项研究中，我们将围压下的气体突破法应用于损坏的花岗岩，以评估在高达 30 MPa 的压力下渗透率与孔隙特征（即孔隙度和输运流道孔径）之间的关系。输送流道孔径、渗透率、热裂花岗岩的孔隙率随着围压的增加而减小。我们量化了渗透率和孔隙特征之间的关系，通过考虑水力连接裂缝的比例，可以更好地估计渗透率。