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Table T4. 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 (distance from borehole wall) in
DIT   Dual Induction Tool  
  IDPH Deep induction resistivity Ωm
  IMPH Medium induction resistivity Ωm
  SFLU Spherically focused 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 inch
  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
HLDT   Hostile Environment Litho-Density Tool  
  RHOB Bulk density (corrected) g/cm3
  PEF Photoelectric effect b/e
  CALI Caliper (measure of borehole diameter) inch
  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
QSST   Inline Check shot Tool  
SGT   Scintillation Gamma Ray Tool  
  ECGR Environmentally corrected gamma ray gAPI
TAP   Temperature/Acceleration/Pressure tool °C, m/s2, psi
WST   Well Seismic Tool  
    Acoustic arrival times ms

Notes: All tool and tool string names (except the TAP and MGT) are trademarks of Schlumberger. For the complete list of acronyms used in the IODP and for additional information about tool physics and use consult IODP Downhole Logging Tools at​TOOLS_LABS/​tools.html.

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