Fracture gradient (Holbrook)

Input(s)

v: Poisson (dimensionless)

$S_{v}$: Vertical Stress (psi)

$P_{p}$: Pore Pressure $(\mathrm{psi})$

Output(s)

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

Formula(s)

$$ S_{h \min }=\left(\frac{v}{1-v}\right) *\left(S_{v}-P_{p}\right)+P_{p} $$

Reference(s)

Mark D. Zoback, Reservoir Geomechanics, Cambridge University Press, UK, Page: 282.