Pore pressure of shale (Traugott)

Input(s)

z: Depth (ft)

SvS_{v}: Sonic Velocity (ft/s)(\mathrm{ft} / \mathrm{s})

RoR_{o}: Resistivity of Shale (ohm ft\mathrm{ft} )

RnR_{n}: Expected Resistivity (ohm ft)

(Pp)hydro \left(P_{p}\right)^{\text {hydro }}: Hydrostatic Pore Pressure (psi)

Output(s)

PpshP_{p s h}: Pore Pressure of Shale (psi)

Formula(s)

Ppsh=z((Svz)((Svz)((Pp)hydro z))((RoRn)1.2))\mathrm{P}_{\mathrm{psh}}=\mathrm{z} *\left(\left(\frac{\mathrm{S}_{\mathrm{v}}}{\mathrm{z}}\right)-\left(\left(\frac{\mathrm{S}_{\mathrm{v}}}{\mathrm{z}}\right)-\left(\frac{\left(\mathrm{P}_{\mathrm{p}}\right)^{\text {hydro }}}{\mathrm{z}}\right)\right) *\left(\left(\frac{\mathrm{R}_{\mathrm{o}}}{\mathrm{R}_{\mathrm{n}}}\right)^{1.2}\right)\right)

Reference(s)

Mark D. Zoback, Reservoir Geomechanics, Cambridge University Press, UK, Page: 47.


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