天然气组分
| Range of Composition of Natural Gas | ||
|---|---|---|
| Category | Component | Amount (%) |
| Paraffinic | Methane (CH4) | 70-98 |
| Ethane (C2H6) | 1 to 10 | |
| Propane (C3H6) | Trace—5 | |
| Butane (C4H10) | Trace—2 | |
| Pentane (C5H12) | Trace—1 | |
| Hexane (C6H14) | Trace-0.5 | |
| Heptane and higher (C7 ) | None—trace | |
| Cyclic | Cyclopropane (C3H6) | Traces |
| Cyclohexane (C6H12) | Traces | |
| Aromatic | Benzene (C6H6), others | Traces |
| Nonhydrocarbon | Nitrogen (N2) | Trace—15 |
| Carbon dioxide (C02) | Trace—1 | |
| Hydrogen sulfide (H2S) | Trace occasionally | |
| Helium (He) | Trace—5 | |
| Other sulfur and nitrogen compounds | Trace occasionally | |
| Water (HO) | Trace—5 | |