What is the term for a formation with constant permeability and no high or low 'streaks'?

• A. Isotropic
• B. Homogeneous
• C. Anisotropic
• D. Permeability-uniform

Answer: (B)

Uniformity of properties throughout a rock formation is what this item is testing. If permeability stays the same everywhere and there are no zones of higher or lower permeability—no streaks—the formation is homogeneous, meaning its properties are the same throughout the volume. Isotropy is about the property behaving the same in all directions, which is related but addresses directional dependence rather than spatial uniformity. Anisotropic means properties vary with direction, which contradicts the idea of constant permeability with no streaks. Permeability-uniform isn’t a standard term. So the term that best fits a formation with constant permeability and no streaks is homogeneous.