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- Petroleum1,680
- Geology1,678
- Natural gas273
- Oil well logging234
- Geology, Stratigraphic206
- Prospecting98
- Petroleum reserves86
- Oil fields81
- Petroleum engineering43
- Hydrocarbon reservoirs42
- Geology, Structural39
- Stratigraphic correlation33
- Geochemistry32
- Mathematical models32
- Natural gas reserves31
- Petroleum in submerged lands31
- Sedimentary basins31
- Petroleum industry and trade26
- Gas fields23
- Stratigraphic traps (Petroleum geology)23