Machine computation
Macroscopic anisotropy
Macroscopic capture cross section
Magma
Magmatic water
Magnaflux
Magnetic declination
Magnetostriction
Make a trip
Mandrel
Manometer
Manual shift
Marine drilling riser
Mark
Mark detector
Marker bed
Marl
Marsh funnel
Mass absorption
Mast
Master bushing
Matrix
Maximum pressure rating
Maximum-reading thermometer
Maximum temperature rating
Md
Measured depth
Measurements-while-drilling
Measure point
Mechanical shift
Mechanical zero
M electrode
Memorizer
Merged data
Metamorphic rock
Meteoric water
Metric system
Metric ton
Mho
Mho per meter
Mica
Microannulus
Microinverse
Microlaterolog
Microlog
Micronormal
Microresistivity log
Micro-Seismogram
Microspherically focused log
Migration
Millidarcy
Milligal
Millivolt box
Mineral
Mineral composition of rocks
Minerals Management Service (MMS) and Royalty Management Operations (RMO)
Minute-mark
Miscible drive
Mist flow
MKS
Mmho
MMS
MN spacing
Mobility
Modified Schmidt diagram
Mol
Mold
Moldic porosity
Mole
Molecule
Molecular weight
Mole percent
Monitor curve
Monocable
Monoelectrode
Montmorillonite
MOP
Movable oil plot
Mud
Mud ball
Mud cake
Mud cup
Mud density
Mud filtrate
Mud hose
Mud log
Mud logging
Mud pit
Mud resistivity log
Mud pump
Mud viscosity
Mud weight
Multiphase flow
Multiple completion
Multishot survey
MWD
