Composition | Chemical structure | Content in PB crude oil (%) | Content in HB crude oil (%) |
Naphthalene series |
| 17.71 | 11.07 |
Phenanthrene series |
| 26.34 | 46.32 |
Chrysene series |
| 4.33 | 11.06 |
Benzopyren + Methylpyrene |
| 1.44 | 6.21 |
Thiophene series |
| 4.77 | 2.82 |
Biphenyl series |
| 1.87 | 0.97 |
Furanseries |
| 1.65 | 1.06 |
Fluorene |
| 2.37 | 2.92 |
Fluoranthene |
| 0.13 | 0.96 |
Benzofluorene |
| 0.20 | 0.94 |
Triaromatic steroid |
| 39.19 | 15.65 |