Ratio of pore pressure change to original due to depletion

Input(s)

P: Change in Pore Pressure (psi)

$S_{\text {hmax }}$: Maximum Horizontal Stress (psi)

$S_{\text {hmin }}$: Minimum Horizontal Stress (psi)

Output(s)

q: Pore Pressure Ratio (fraction)

Formula(s)

$$ \mathrm{q}=\frac{\mathrm{P}_{\mathrm{p}}}{\mathrm{S}_{\mathrm{hmax}}-\mathrm{S}_{\mathrm{hmin}}} $$

Reference(s)

Mark D. Zoback, Reservoir Geomechanics, Cambridge University Press, UK, Page: 393.