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.

Compacted thickness (m)

Present-day (compacted) thickness in metres.

Porosity

Present-day porosity as a fraction (0-1).

Target porosity

Porosity assumed at deposition as a fraction (0-1); default 0 (full decompaction).

Grain-volume-conserving decompaction of a compacted unit: t' = t * (1 - porosity) / (1 - target porosity). Porosities are fractions. 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]

Decompacted thickness (m)

Decompacted thickness at the target porosity in metres.

• 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.

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