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6 in-depth references

Petrophysics Calculators

Use 6 in-depth petrophysics petroleum engineering calculators with formulas, units, default calculations, source references, assumptions, and limitations.

Petrophysics calculators support porosity, saturation, resistivity, formation factor, shale correction, SP-log, nuclear-log, and core-log interpretation workflows.

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PetrophysicsResistivity Logs

Indonesian Water Saturation from Shaly Sand Logs

Sw=[1/RtVsh1−0.5VshRsh+ϕemaRw]2/nS_w=\left[\frac{\sqrt{1/R_t}}{\frac{V_{sh}^{1-0.5V_{sh}}}{\sqrt{R_{sh}}}+\sqrt{\frac{\phi_e^m}{aR_w}}}\right]^{2/n}
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PetrophysicsResistivity Logs

Archie Water Saturation from Resistivity Logs

Sw=[(aϕm)(RwRt)]1/nS_w = \left[\left(\frac{a}{\phi^m}\right)\left(\frac{R_w}{R_t}\right)\right]^{1/n}
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PetrophysicsRock Properties

Brooks-Corey Drainage Capillary Pressure

Pc=PeSe−1/λ,0<Se≤1P_c=P_e S_e^{-1/\lambda},\quad 0<S_e\leq1
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PetrophysicsRock Properties

Gassmann Saturated Rock Bulk Modulus

Ksat=Kd+αB2ϕ/Kf+(αB−ϕ)/KsαB=1−Kd/Ks\begin{aligned}K_{\mathrm{sat}}&=K_d+\frac{\alpha_B^2}{\phi/K_f+(\alpha_B-\phi)/K_s}\\\alpha_B&=1-K_d/K_s\end{aligned}
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PetrophysicsRock Properties

Sonic Porosity Raymer-Hunt-Gardner Method

Φsonic=CRHGΔt−ΔtmaΔt\Phi_{sonic}=C_{RHG}\frac{\Delta t-\Delta t_{ma}}{\Delta t}
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PetrophysicsRock Properties

van Genuchten Capillary Pressure

Pc=P0(Se−1/m−1)1−mn=1/(1−m)\begin{aligned}P_c&=P_0(S_e^{-1/m}-1)^{1-m}\\n&=1/(1-m)\end{aligned}
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