Petroleum Reservoir Engineering Practice

Appendix 8A. Correlations for Estimating Residual Gas Saturations for Gas Reservoirs under Water Influx*

*From Agarwal

Agarwal² developed correlations for the estimation of residual gas saturations in gas reservoirs under water influx. Note that these correlations are to be used if no laboratory data are available for the reservoir.

For unconsolidated sandstones:

(8A.1)

In Eq. (8A.1),

a₁ = −0.51255987, a₂ = 0.026097212, a₃ = −0.26769575, a₄ = 14.796539.

For consolidated sandstones:

(8A.2)

In Eq. (8A.2), a₁ = 0.80841168, a₂ = −0.0063869116

For ...