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.