Petroleum Geology 192 Petroleum industry and trade 87 Natural gas 83 Prospecting 64 Refining 47 History 41 更多 ... Oil fields 33 Petroleum engineering 32 Environmental aspects 24 Transportation 24 Geology, Stratigraphic 20 Petroleo 20 Prices 20 Hydrocarbon reservoirs 19 Petroleum reserves 19 Gas fields 17 Analysis 16 Political aspects 14 Energy policy 13 Oil reservoir engineering 13 Petroleum products 13 Coal 12 Mathematical models 12 Oil spills 12 Taxation 12 Economic aspects 11 Energy industries 11 Data processing 10 Seismic prospecting 10 少 ...