What are factor affecting permeability of rock?

The permeability of rock is influenced by several factors, including porosity, which refers to the volume of void spaces within the rock; grain size and distribution, which affect how easily fluids can flow through the material; and the degree of cementation, as tightly bound grains can restrict fluid movement. Additionally, the presence of fractures and faults can enhance permeability by providing pathways for fluid flow. Lastly, the fluid's viscosity and the pressure conditions can also impact how easily it moves through the rock.