IDENTIFICATION OF TYPE OF RESERVOIR FLUID - Petroleum Reservoir Fluid Property Correlations - page 196

Figure 5-3 is a subset consisting of 130 data points from the data
shown in figure 5-4. Figure 5-4 shows a correlation of initial producing
gas-liquid ratios against the composition of the reservoir fluid
represented by the composition of the heptanes plus fraction. The full
data set contains 1,451 different reservoir fluid studies (PVT reports)
that used reservoir fluid samples with worldwide origins.

200000

175000

150000

125000

100000

75000

50000

25000

0

0 20 40 60 80 100

Composition of Heptanes Plus In Reservoir Fluid, mole%

Fig. 5-4. Initial producing gas-liquid ratio correlates well with composition of heptanes plus in
reservoir fluid (data from 1,441 reservoir fluid studies).

Figure 5-5 is a more useful presentation of the data of figure 5-4.
Notice that reservoir fluids with initial producing gas-liquid ratios as
high as 1,000,000 scf/STB exhibit dew points at reservoir temperature,
i.e., they are gas condensates.