Reservoir EngineeringUnconventional Reservoirs

Somerton Formation Permeability in Coalbed Methane Reservoirs Formula

k=k_o\left[\exp\left(\frac{-0.003\Delta\sigma}{k_o^{0.1}}\right)+0.0002(\Delta\sigma)^{1/3}k_o^{1/3}\right]

Somerton Formation Permeability in Coalbed Methane Reservoirs calculates formation permeability for unconventional reservoirs workflows in reservoir engineering.

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How engineers use this formula

Use this formula when the listed inputs (k_o, Delta_sigma) are known and the assumptions behind the cited unconventional reservoirs relationship match the engineering case being checked.

Assumptions

Input values are representative for the well, reservoir, fluid, or equipment case being evaluated.
The declared units match the field-unit constants used in the formula.
The cited formula applies to the selected petroleum engineering workflow.

Limitations

The calculation does not replace a full engineering model or operating procedure.
Accuracy depends on the source correlation, assumptions, input quality, and unit consistency.