Understanding the permeability of fractured rocks can make for significant advances in the development of fluid flow and mass transport modeling. This paper investigates the effects of fracture number, length, and aperture on the permeability of fractured rocks with extremely low matrix permeability. For this purpose, we apply numerical estimations of fracture-scale permeability to fractured rock samples containing 3D discrete fracture networks (DFNs). The resulting permeability behavior is analyzed for the number, the aperture and the length distribution of the fractures. Our results indicate that permeability is sensitive not only to the fracture number but also to the geometrical characteristics of DFN. In particular, our study suggests that the increase in fractures parameters increases the uncertainty of the relation between fracture parameters and permeability. The comparison of permeability values with fractures intersections shows that increasing permeability coincides with increasing intersection points number and a total length of intersection lines.

了解裂隙岩的渗透性可以在流体流动和传质模型的发展方面取得重大进展。本文研究了裂缝数，长度和孔径对基质渗透率极低的裂隙岩渗透率的影响。为此，我们将裂缝尺度渗透率的数值估算应用于包含3D离散裂缝网络（DFN）的裂缝岩石样品。分析所得渗透率行为的裂缝数量，孔径和长度分布。我们的结果表明，渗透率不仅对裂缝数敏感，而且对DFN的几何特征敏感。特别是，我们的研究表明，裂缝参数的增加增加了裂缝参数与渗透率之间关系的不确定性。渗透率值与裂缝相交的比较表明，渗透率的增加与相交点数的增加和相交线的总长度一致。