ID
Ideal gas
Igneous rock
Igniter
Impedance
Impermeable
Immiscible
Inclination
Inclinometer
Index
Induced polarization
Induced spectral gamma-ray log
Induction-Electrolog
Induction log
Inelastic collision
Inelastic scattering
Injection well
In situ
In-situ combustion
Insular globules
Insular saturation
Insulation
Integrate
Integrated travel time
Intensity modulated-time
Interface
Intermediate casing string
Internal phase
International system of units
Interstitial water
Interval transit time
Interval transit time integration
Interval transit-time stretch
Intervalometer
Intrinsic thermal decay time
Intrusive
Invaded zone
Invasion diameter
Invert oil emulsion
Invert oil mud
Ion(s)
Ion exchange
Ionization
Ionization chamber
IR drop
Irradiation
Irreducible saturation
Irreducible water saturation
Isopach map
Isosaturation surface
Isothermal
Isotopes
Isotropy
Iterative