Collective Compound term for oil, gas condensate and natural gasand their mixtures, normally encountered in subsurface reservoirs.
Its composition is dominated by pure hydrocarbons ( see Hydrocarbon @ Wikipedia )usually Alkanes, Naphthenes, Aromatics, Asphaltics) and may also include the other organic and inorganic chemical substances (like carbon dioxide, nitrogen, hydrogen sulfide, helium etc.).
Table 1 – Example of composition of several Petroleum Hydrocarbon (in mol % )
| Substance | Dry Gas | Wet Gas | Condensate | Volatile Oil | Black Oil |
|---|---|---|---|---|---|
| CO2 | 0.10 | 1.41 | 2.37 | 1.82 | 0.02 |
| N2 | 2.07 | 0.25 | 0.31 | 0.24 | 0.34 |
| C1 | 86.12 | 92.46 | 73.19 | 57.60 | 34.62 |
| C2 | 5.91 | 3.18 | 7.80 | 7.35 | 4.11 |
| C3 | 3.58 | 1.01 | 3.55 | 4.21 | 1.01 |
| i C4 | 1.72 | 0.28 | 0.71 | 0.74 | 0.76 |
| n C4 | 0.24 | 1.45 | 2.07 | 0.49 | |
| i C5 | 0.50 | 0.13 | 0.64 | 0.53 | 0.43 |
| n C5 | 0.08 | 0.68 | 0.95 | 0.21 | |
| C6s | 0.14 | 1.09 | 1.92 | 1.16 | |
| C7+ | 0.82 | 8.21 | 22.57 | 56.40 | |
| Rs (SCF/STB) | ∞ | 69,000 | 5965 | 1465 | 320 |
| Rv (STB/MMSCF) | 0 | 15 | 165 | 680 | 3125 |
| API gravity | 65.0 | 48.5 | 36.7 | 23.6 | |
| M7+ | 132 | 184 | 240 | 274 | |
| γ7+ | 0.750 | 0.816 | 0.864 | 0.920 |
See Also
...
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petroleum Geology / Petroleum Reservoir Fluids
References
...