Use this geological calculation for a transparent first-pass interpretation of measured rock, soil, fluid, well, stratigraphic, isotopic, geophysical, or seismic data under an explicitly selected model.

Swc

Irreducible (connate) water saturation as a fraction.

Sor

Residual oil saturation as a fraction.

Mu w

Water viscosity in millipascal seconds.

Mu o

Oil viscosity in millipascal seconds.

Find the Buckley-Leverett shock-front water saturation by the Welge tangent construction on a Corey fractional-flow curve. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Swf

Shock-front water saturation as a fraction.

fw(Swf)

Fractional flow of water evaluated at the front.

• Geological models are scale-, site-, method-, and calibration-dependent. Heterogeneity, anisotropy, sampling, diagenesis, pressure-temperature history, instrument response, boundary conditions, and empirical-correlation range can dominate the result.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Compare independent measurements and models, retain units and analytical metadata, propagate uncertainty, and validate interpretations against logs, cores, maps, laboratory data, or field observations.

• Capillary Pressure Brooks Corey Calculator

  Evaluate the Brooks-Corey capillary pressure curve Pc = Pe * Se^(-lambda) for a wetting-phase saturation.

• Fractional Flow Water Calculator

  Compute the water fractional flow fw from relative permeabilities and viscosities, neglecting gravity and capillary pressure.

• Preconsolidation Pressure Calculator

  Maximum past effective vertical stress sigma_p' = OCR * sigma_v0' from the definition of the overconsolidation ratio. Stresses in kPa; use a Casagrande construction on the oedometer curve for direct measurement.