| Word | Definition |
| IEA | International Energy Agency |
| Igneous Rocks | Rocks formed from solidification of molten magma. |
| Impermeable | Fluids and gases cannot flow through a specific rock formation. The pores and cracks are to small to enable the migration of fluids or gases. ... |
| Imported Refiners' Acquisition Cost (IRAC) | The average price for imported oil paid by U.S. refiners. |
| Improved Recovery | Extraction of crude oil or natural gas by any method other than those that rely primarily on natural reservoir pressure, gas... |
| In-situ | In its original place; in position; in-situ recovery refers to various methods used to recover deeply buried bitumen deposits, including steam injecti... |
| Infill Drilling | Wells drilled between established producing wells on a lease in order to increase production from the reservoir. |
| Injection Well | A well used for injecting air, steam or fluids into an underground formation. |
| Injections | Natural gas injected into storage reservoirs. |
| Intangible Drilling and Development Costs (IDC) | Costs incurred in preparing well locations, drilling and deepening wells, and preparing wells for initial production up thro... |
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