Page 122 - Geology and Geochemistry of Oil and Gas

94 CRUDE OILS

Fig. 5.3. Ternary diagram showing the composition of six classes of crude oils from 541 oil fields (after
Tissot and Welte, 1978, p. 373).

TABLE 5.2

Distribution of crude oil types by density (after T.A. Botneva, in: Eremenko and Chilingar, 1996, p. 66)
3
Crude oil (density in g/cm ) Type of oil (in %)
I II III IV V VI VII VIII IX
Light (0.850) 70.9 69.5 60.0 36.8 18.7 18.7 7.7 2.7 12.5
Medium (0.851–0.870) 19.3 18.2 21.5 42.1 37.5 21.8 — 2.7 —
Heavy (0.871–0.900) 5.9 7.5 15.3 21.1 37.5 37.7 41.0 — 12.5
Very heavy (40.900) 3.9 4.8 3.2 — 6.3 21.4 51.3 54.3 75.6

TABLE 5.3
Distribution of sulfur content in various types of crude oil (after T.A. Botneva, in: Eremenko and
Chilingar 1996, p. 66)
Crude oil (sulfur content in %) Type of oil (in %)

I II III IV V VI VII VIII IX
Low-sulfur oils (o0.5) 59.7 60 78.7 60 76.4 72.2 43.7 40.0 16.6
Medium-sulfur oils (0.5–2.0) 39.1 36 18.1 40 33.6 37.6 56.3 56.0 33.6
High-sulfur oils (42) 1.2 4 3.2 — — — — — 49.8