Reservoir Saturation Tool

Quick Answer

The reservoir saturation tool computes water saturation (sw) from archie's equation from the input values you provide.

Result Interpretation

Each output is evaluated from the deterministic expression shown above; no approximations are applied.

Worked Example

Verified calculation

Given:

tortuosity_factor = 1
formation_water_resistivity = 0.1
porosity = 0.2
cementation_exponent = 2
true_formation_resistivity = 100
saturation_exponent = 2

Expected Result:

out_water_saturation_sw_from_archies_equation = 6.3245553203368

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from verified test cases.

Formula / Method

Water Saturation (Sw) from Archie's Equation: pow(((tortuosity_factor * formation_water_resistivity) / (pow(porosity, cementation_exponent) * true_formation_resistivity)), (-1 / saturation_exponent))

Regenerated deterministic calculation under

Variables

Symbol	Label	Role	Description
tortuosity_factor	Tortuosity Factor	INPUT	Tortuosity Factor
formation_water_resistivity	Formation Water Resistivity	INPUT	Formation Water Resistivity
porosity	Porosity	INPUT	Porosity
cementation_exponent	Cementation Exponent	INPUT	Cementation Exponent
true_formation_resistivity	True Formation Resistivity	INPUT	True Formation Resistivity
saturation_exponent	Saturation Exponent	INPUT	Saturation Exponent
out_water_saturation_sw_from_archies_equation	Water Saturation (Sw) from Archie's Equation	OUTPUT	Water Saturation (Sw) from Archie's Equation

Calculation Steps

Enter the tortuosity factor.
Enter the formation water resistivity in ohm.m.
Enter the porosity in -.
Enter the cementation exponent.
Enter the true formation resistivity in ohm.m.
Enter the saturation exponent.
Step 1: Compute water saturation (sw) from archie's equation.
Read the water saturation (sw) from archie's equation from the results.

Engineering Summary

What value does Reservoir Saturation Tool produce for the given inputs? The calculation uses deterministic formula evaluation. This tool is applicable in engineering calculation.

Notes / Limitations

ASSUMPTIONAll inputs are finite numeric values within the physical range intended by the tool.
LIMITATIONResults follow the regenerated deterministic formula exactly; legacy page heuristics (rounding/formatting) are not reproduced.

Frequently Asked Questions

What does this calculator calculate?

The Reservoir Saturation Tool estimates Water Saturation (Sw) from Archie's Equation based on the input parameters you provide

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Formation Water Resistivity (ohm.m), Porosity (-), True Formation Resistivity (ohm.m). Make sure all inputs use the specified units for consistent results

How does Tortuosity Factor affect the results?

The tortuosity factor directly affects: Water Saturation (Sw) from Archie's Equation. Increasing or decreasing this value will change these output values according to the engineering formula

How should I interpret the calculated results?

The calculator provides the following outputs: water saturation (sw) from archie's equation. Results are computed from the input values using the defined calculation method. Always verify results against project-specific requirements and applicable standards

What assumptions does this calculator use?

This calculator uses verified engineering formulas; the calculation method is based on deterministic formula evaluation. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

When is this calculation useful?

The Reservoir Saturation Tool is useful during preliminary design, feasibility studies, and quick engineering checks in engineering calculation projects. It helps engineers and designers estimate key parameters before proceeding with detailed analysis

Technical Details

Assumption: All inputs are finite numeric values within the physical range intended by the tool.
Limitation: Results follow the regenerated deterministic formula exactly; legacy page heuristics (rounding/formatting) are not reproduced.