Rock expansion term in abnormally pressured gas reservoirs
Input(s)
\(c_{f}\): Formation Compressibility \((1 / \mathrm{psi})\)
\(c_{w}\): Water Compressibility \((1 / \mathrm{psi})\)
\(S_{w i}\): Initial Water Saturation (fraction)
Output(s)
\(E_{R}\): Rock Expansion Term (1/psi)
Formula(s)
\[
E_{R}=\frac{c_{f}+c_{w} * S_{w i}}{1-S_{w i}}
\]
Reference(s)
Ahmed, T., McKinney, P.D. 2005. Advanced Reservoir Engineering, Gulf Publishing of Elsevier, Chapter: 3, Page: 213