| Word | Definition |
| 3D Seismic | 3D seismic is derived from a set of seismic lines. The geophones are spaced about 300 m (1000 ft) to more than 600 m (2000 ft). Sample sizes are commo... |
| Abandonment | The process of converting a drilled well to a condition that can be left indefinitely without further attention and will not damage freshwater supplie... |
| Abandonment Allowance (AA) | A 100% allowance for expenditure incurred in the of abandoning a well or a field. |
| Abiogenic Theory | A theory that maintains petroleum originated from hydrocarbons that were trapped inside the Earth during the planet's formations and are slowly mo... |
| Abiotic Components | Non-living chemical and physical components found on earth. These components are sunlight, temperature, water, oxygen, climate and soil. |
| Absorber | A tower where natural gas comes into contact with lean glycol. The glycol is used to remove most of the water from the gas. |
| Absorption plant | A processing facility that removes water and liquid hydrocarbons from natural gas. |
| ACCOM | Accommodation |
| Accumulator | A storage vessel for gas or liquids. |
| Acid Fracture (Frac) | To create fractures in producing, hard limestone formations by using a combination of oil and acid, or water and acid, under high pressure. |
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