- repayment
- repeatability
- repelling agent
- regulator valve
- regulus
- reinforced plastic
- rejuvenated river
- rejuvenation
- related rock
- relative pressure
- relatively prime
- relativistic correction
- released heat
- relic
- reliction
- relief displacement
- relief model
- reoxidation
- reoxidized
- repair outfit
- repeated loading
- Replacement cost
- replacement deposit
- replacement lode
- Reppe process
- repress oil
- repressuring
- requirement
- rerun
- rerun oil
- rerun unit
- rerunning still
- resampling
- rescue apparatus
- research department
- research engineer
- resequent valley
- reserve
- reserve pit
- reserve storage
- reservoir bed
- reservoir engineering
- reservoir pressure
- reservoir rock
- reservoir trap
- residence time
- residual
- residual anomaly
- residual ash
- residual asphalt
- residual charge
- residual current
- residual error
- residual fuel
- residual gas
- residual liquor
- residuum
- resin formation
- resin plaster
- resinous
- resinous lustre
- resinous wood
- resistant mineral
- resistivity log
- resitol
- resol
- resolution
- resolved level
- resorb
- resorcinol
- resorcinol resin
- resorption
- rest magma
- restitution
- restrain
- retaining plug
- retaining wall
- retarded elasticity
- retarding agent
- retempering
- resistant
- resisting
- resistivity curve
- resite
- resorufine
- rest austenite
- restricted solubility
- restrictor
- resurgent gas
- resurrected peneplain
- retainer assembly
- retarded cement
- retarder
- retene
- reticulate
- retimber
- retreat
- retrievable packer
- retrieval process
- retrograde condensate