Probabilistic volumetrics

EG556N demo field

200,000 runsSeed 3Latin Hypercube

Edited: press Run to update

Inputs

in formula order

STOIIP = A · h · NTG · φ · (1 − Sw) / Boi

Area

P90 (low)

P50

P10 (high)

Gross thickness

P90 (low)

P50

P10 (high)

Net-to-gross

P90 (low)

P50

P10 (high)

Porosity

P90 (low)

P50

P10 (high)

Water saturation

P90 (low)

P50

P10 (high)

Oil saturation is calculated as 1 − Sw.

Boi

Minimum

Most likely

Maximum

Held at 1.00 or above: oil cannot expand on its way to surface.

Oil density

Optional. Needed for results in tonnes.

Correlations

Spearman rank

Porosity and Sw

NTG and porosity

NTG and Sw

These correlations can coexist

Simulation

Runs

Seed

Splits each input's range into equal-probability slices and samples every slice once, so results settle in fewer runs.

Above 100,000 runs, results update when you press Run.

Running the case

The simulation runs in your browser.