PROPERTIES OF RESERVOIR GASES - Petroleum Reservoir Fluid Property Correlations - page 11

0.8

0.6

0.4

0.2

0.0

-0.2

-0.4

2.2

2.0

1.8

1.6

1.4

1.2

1.0

0.6 0.8 1.0 1.2 1.4 1.6

Reservoir Gas Specific Gravity

Dranchuk Abou-Kassem Hall-Yarborough

Fig. 2-1. Comparisons of relative errors in z-factors between Dranchuk-Abou-Kassem and
Hall-Yarborough equations. All calculations used the Piper et al. equations to calculate the
pseudocritical properties.