// multi-utility computation suite · offline · instant · precise
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sci.Archie-water-saturation Calculator
Calculates water saturation Sw of a reservoir rock from formation resistivity using Archie's law: Sw^n = (a × Rw)/(φ^m × Rt). Cementation exponent m ≈ 2 and saturation exponent n ≈ 2 are typical for sandstones — carbonate rocks require laboratory-measured Archie parameters.
Inputs
Rw Ohm M
Reference formula or conversion factor shown for context.
Rt Ohm M
Reference formula or conversion factor shown for context.
Phi Pct
Reference formula or conversion factor shown for context.
A Tortuosity
A multiplier applied in the calculation.
M Cementation
Reference formula or conversion factor shown for context.
N Saturation
Reference formula or conversion factor shown for context.
Results
water saturation Sw
How close the system is to its capacity limit. Above 80% sustained saturation typically leads to queuing and latency spikes.
hydrocarbon saturation Sh
How close the system is to its capacity limit. Above 80% sustained saturation typically leads to queuing and latency spikes.
formation factor F = a/φᵐ
A dimensionless multiplier applied in the calculation.
Archie: Sw = (F·Rw/Rt)^(1/n)
Sample size or count used in the calculation.
clean sandstone defaults
Sample size or count used in the calculation.
Sw > 80% = water zone | Sw < 40% = hydrocarbon-bearing