Which of the following is not listed as a factor controlling relative permeability?

Which of the following is not listed as a factor controlling relative permeability?

• A. Pore Geometry
• B. Temperature
• C. Wettability
• D. Fluid Distribution

Answer: (B)

The key idea is how the rock’s pore-scale properties and fluid interactions shape how easily each phase can flow at a given saturation. Relative permeability is governed by how the pore space connects and how fluids arrange themselves within it. Pore geometry sets the size, shape, and connectivity of pathways, which directly controls where and how easily a phase can move. Wettability determines which phase coats the rock surface and how capillary forces bias phase distribution, affecting which pores are occupied by which fluid at a given saturation. Fluid distribution describes the actual arrangement of oil and water in the pores, including ganglia, films, and bridging, which changes the connectivity of the flow paths for each phase. Temperature, while it does change fluid properties like viscosity and interfacial tension, is not a separate controlling factor of relative permeability itself. Relative permeability curves are typically defined at a fixed temperature, so temperature mainly alters the measured values by changing fluid properties rather than altering the fundamental factors that govern how saturations translate into flow pathways.

The key idea is how the rock’s pore-scale properties and fluid interactions shape how easily each phase can flow at a given saturation. Relative permeability is governed by how the pore space connects and how fluids arrange themselves within it. Pore geometry sets the size, shape, and connectivity of pathways, which directly controls where and how easily a phase can move. Wettability determines which phase coats the rock surface and how capillary forces bias phase distribution, affecting which pores are occupied by which fluid at a given saturation. Fluid distribution describes the actual arrangement of oil and water in the pores, including ganglia, films, and bridging, which changes the connectivity of the flow paths for each phase.

Temperature, while it does change fluid properties like viscosity and interfacial tension, is not a separate controlling factor of relative permeability itself. Relative permeability curves are typically defined at a fixed temperature, so temperature mainly alters the measured values by changing fluid properties rather than altering the fundamental factors that govern how saturations translate into flow pathways.