 |
| |||
| difficult (igisheva); hard-to-recover (igisheva) | |||
| |||
| difficult (oil resources whose production is problematic; запасы); problematic (запасы) | |||
| трудноизвлекаемый: 23 phrases, 7 sujets |
| Champs de pétrole | 4 |
| Général | 1 |
| Pétrole / pétrole | 3 |
| Pétrole et gaz | 10 |
| Sakhaline | 2 |
| Technologie pétrolière et gazière | 1 |
| Tengiz | 2 |