Capillary Pressure Models

Compare capillary pressure curves using Brooks-Corey and Van Genuchten models. Includes Leverett J-function for scaling between different rock types.

Models:

• Brooks-Corey: Pc = Pd × Se^(-1/λ), where Se is normalized saturation
• Van Genuchten: Se = [1 + (αPc)^n](-m), where m = 1 - 1/n
• Leverett J-function: Dimensionless Pc for correlating between rocks

Typical Parameters:

• λ (pore size distribution): 0.5-6 (higher = more uniform pores)
• Pd (entry pressure): 1-50 psi for sandstones
• α (Van Genuchten): 0.001-1 [1/psi]
• n (Van Genuchten): 1.5-10 (must be > 1)