A – B – C – D – E – F – G – H – I – J – K – L – M – N – O – P – R – S – T – U – V – W – X
| GV | Gainesville Gulf of Mexico leasing area |
| GRC | Galvanized rigid conduit |
| GA | Galveston Area Gulf of Mexico leasing area |
| GR | Gamma ray |
| IH | Gamma Ray Log |
| GRN | Gamma Ray Neutron Log |
| GB | Garden Banks Gulf of Mexico leasing area |
| GASAN | Gas Analysis Report |
| GC | Gas chromatography |
| GC/MS | Gas chromatography/mass spectrometry |
| G/C | Gas Condensate |
| GDT | Gas Down To |
| GIIP | Gas Initially In Place |
| GL | Gas Lift |
| GLM | Gas Lift Mandrel (alternative name for Side Pocket Mandrel) |
| GLV | Gas Lift Valve |
| GLR | Gas Liquid Ratio |
| GAS | Gas Log |
| GMAW | Gas metal arc welding |
| GOC | Gas Oil Contact |
| GOR | Gas Oil Ratio |
| GOSP | Gas oil separation plant |
| GS | Gas Supplier |
| GTL | Gas To Liquid |
| GTW | Gas To Wire |
| GWC | Gas/water contact |
| GGRG | Gauge Ring |
| GdF | Gaz de France |
| GCT | GCT Log |
| GS | Gel Strength |
| GA | General arrangement (of offshore equipment) |
| GL | General ledger |
| G-INC | General US INCs. G-110 |
| GAAP | Generally accepted accounting principles |
| GEODY | GEO DYS Log |
| GPSL | Geo Pressure Log |
| GWREP | Geo Well Report |
| GEOCH | Geochemical Evaluation |
| GEOEV | Geochemical Evaluation Report |
| GDAT | Geodetic Datum |
| GDIP | Geodip Log |
| GIS | Geographic Information System |
| GPLT | Geol Plot Log |
| GEOFO | Geological & Formation Evaluation Report |
| GEOPR | Geological Operations Progress Report |
| GOP | Geological Operations Report |
| GEORE | Geological Report |
| SUMST | Geological Summary Sheet |
| GEOL | Geological Surveillance Log |
| GEOPN | Geological Well Prognosis Report |
| G&G | Geology and geophysics |
| GEOP | Geophone Data Log |
| GJ | Gigajoule |
| GRP | Glass Reinforced Plastic |
| SFERAE | Global Association for the use of knowledge on Fractured Rock in a state of Stress, in the field of Energy, Culture and Environment |
| GRSS | Global Rig Share Solutions group |
| GHS | Globally Harmonized System of Classification and Labelling of Chemicals |
| GLT | GLT Log |
| GCAT | Government Compliance Action Team |
| GRSVY | Gradient Survey Log |
| GRAD | Gradiometer Log |
| GI | Grand Isle Area Gulf of Mexico leasing area |
| GCLOG | Graphic Core Log |
| GRLOG | Grapholog |
| GP | Gravel pack |
| GBT | Gravity Base Tank |
| GBS | Gravity Based Structure |
| GC | Green Canyon Gulf of Mexico leasing area |
| GHG | Greenhouse gas |
| GDP | Gross domestic product |
| GRV | Gross Rock Volume |
| GE | Ground Elevation |
| GRE | Ground Elevation |
| GFCI | Ground fault circuit interrupter |
| GL | Ground Level |
| GLE | Ground Level Elevation (generally in metres above mean sea level) |
| GST | GST Log |
| GCC | Gulf Cooperation Council (Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the United Arab Emirates) |
| GOM | Gulf of Mexico |
| GMP | Gulf of Mexico Program |
| GOMR | Gulf of Mexico region |
| GUN | Gun Set Log |