Salinity
Salt base mud
Salt dome
Salt water
Saltwater disposal
Saltwater mud
Sample log
Sample taker
Sand
Sand control
Sand count
Sand line
Sandstone
Saturated
Saturation
Saturation exponent
Sawtooth SP
SBR
Scale
Scanning electron microscope
Scattered gamma-ray log
Schmidt diagram
Scintillation
Scintillation counter
Screen
Screen analysis
Sealed reservoir
Search interval
Sea water
Secondary porosity
Secondary porosity index
Secondary recovery
Second curve
Section gauge
Sediment
Sedimentary
Sedimentary basin
Seismic
Seismic attenuation
Seismic discontinuity
Seismograph
Selective SP
Self absorption
Self potential
SEM
SEM photomicrograph
Sensitivity
Separation
Set casing
Set pipe
Shadow zone
Shale
Shale base line
Shale-membrane potential
Shale oil
Shale potential
Shale shaker
Shaly
Shaped charge
Shape factor
Shear modulus
Shear wave
Shielded electrode
Short
Short normal curve
Shoulder-bed effect
Shut in
Shut-in
Shut-in bottom-hole pressure
Shut-in pressure
Shut-in-time
Side bed
Side-door overshot
Sidetrack
Sidewall acoustic log
Sidewall core
Sidewall coring tool
Sidewall epithermal neutron log
Sidewall neutron (porosity) log
Sidewall pad
Sidewall sample
Siliceous
Sigma log
Sigma unit
Signal
Signature log
Single-point resistance log
Single-receiver Dt curve
Sinker bar
Skid
Skid unit
Skin
Skin depth
Skin effect
Skin factor
Skip
Slant-hole Express
Slim-hole drilling
Slippage velocity
Slug
Slug flow
Small slam
Snorkel
Society of Petroleum Engineers
Society of Professional Well Log Analysts
Soft formation
Soft rock
Soft rock discipline
Software
Solution
Solution gas
Solution-gas drive
Solution gas-oil ratio
Sonar
Sonar caliper
Sonde
Sonde error
Sonic log
Sonic t stretch, sonic Dt stretch
Sour
Source
SP
Spacing
Span
SPE
Specific acoustic time
Specific activity
Specific gravity
Specific heat
Spectral gamma-ray log
Spherically focused log
Spike
Spine-and-ribs plot
Spinner
Spinner survey
Spontaneous potential
SP reduction factor
Spud
Spud in
Spurt loss
SPWLA
Squeeze cementing
SSP
Standard conditions
Standard conditions of temperature and pressure
Standard cubic foot of gas
Standard deviation
Standoff
Stand of pipe
Static
Static fluid level
Static mud column pressure
Static spontaneous potential
Static well conditions
Statistical check
Statistical fluctuations
Statistical variations
Step
Step-out well
Step profile
Stick plot
Stimulation
Stock tank barrel
Stoneley wave
STP
Strata
Stratalogs
Stratification
Stratigraphic trap
Stratigraphy
Stratum
Streaming potential
Stretch
Strike
Strip log
Strip over
Stripper
Stripper well
Structural
Structural trap
Stuck pipe
Stuck point
Stuffing box
Sub
Substructure
Suction line
Suction pit
Super-saturated
Surface casing
Surface conductance
Surface pipe
Surface pressure
Survey
Survey cable
Swab
S-wave
Sweet
Symbols
Syncline
Synergetic
Synthetic seismogram
