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of heptanes plus in the reservoir fluid is less than 12.9 mol%, the fluid is
a gas. The transition from gases to oils is very distinct; only three of the
hundreds of data points do not fit this pattern.
2500
2250
2000
1750
1500
1250
1000
16
18
20
22
24
26
28
30
Composition of Heptanes Plus In Reservoir Fluid, mole %
Fig. 5-7. Which composition of heptanes plus defines black oils and volatile oils? (Data are from
217 reservoir fluid studies.)
Dry gases
If the values of producing gas-liquid ratios equal to and greater than
100,000 scf/STB are accepted as indicators of gases that can be treated as
dry gases, figure 5-5 indicates a corresponding composition of heptanes
plus of less than approximately 0.5 mol%.
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