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Table T14. Acronyms and units used for wireline logging tools.

Tool Output Tool name/Explanation of output Unit
APS Accelerator Porosity Sonde  

APLC Near array porosity (limestone calibrated) %
SIGF Formation capture cross section (Σf) Capture units
STOF Tool standoff (computed distance from borehole wall) in
DLL Dual Laterolog  

LLD Deep resistivity Ωm
LLS Shallow resistivity Ωm
DSI Dipole Sonic Imager  

DTCO Compressional wave delay time (Δt) ms/ft
DTSM Shear wave delay time (Δt) ms/ft
DTST Stoneley wave delay time (Δt) ms/ft
FMS Formation MicroScanner  

C1, C2 Orthogonal hole diameters in
P1AZ Pad 1 azimuth Degrees
  Spatially oriented resistivity images of borehole wall  
GPIT General Purpose Inclinometer Tool  

DEVI Hole deviation Degrees
HAZI Hole azimuth Degrees
Fx, Fy, Fz Earth’s magnetic field (three orthogonal components) Oersted
Ax, Ay, Az Acceleration (three orthogonal components) m/s2
HLDS Hostile Environment Litho-Density Sonde  

RHOM Bulk density (corrected) g/cm3
PEFL Photoelectric effect b/e
LCAL Caliper (measure of borehole diameter) in
DRHO Bulk density correction g/cm3
HNGS Hostile Environment Gamma Ray Sonde  

HSGR Standard (total) gamma ray gAPI
HCGR Computed gamma ray (HSGR minus uranium contribution) gAPI
HFK Potassium wt%
HTHO Thorium ppm
HURA Uranium ppm
SGT Scintillation Gamma Ray Tool  
  ECGR Environmentally corrected gamma ray gAPI
TAP Temperature/Acceleration/Pressure tool °C, m/s2, psi
UBI Ultrasonic Borehole Imager  

Spatially oriented acoustic images of borehole wall  
Acoustic arrival times and amplitude ms
Borehole diameter in
Borehole azimuth Degrees
WST-3 Three-component Well Seismic Tool  

Acoustic arrival time ms
GBM Goettingen Borehole Magnetometer  

Fx, Fy, Fz Earth’s magnetic field (three orthogonal components) nT
Nx, Ny Inclination Degrees
T1,T2 Telemetry and gyro temperature °C

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