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Table T12. Acronyms and units for downhole wireline tools and measurements, Expedition 330.

Tool Output Explanation 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) Inch
DIT     Dual Induction Tool  
IDPH Deep induction resistivity Ωm
IMPH Medium induction resistivity Ωm
SFLU Spherically focused resistivity Ωm
DSI   Dipole Shear Sonic Imager  
DTCO Compressional wave delay time (Δt) µs/ft
DTSM Shear wave delay time (Δt) µs/ft
DTST Stoneley wave delay time (Δt) µs/ft
FMS   Formation MicroScanner  
C1, C2 Orthogonal hole diameters Inch
P1AZ Pad 1 azimuth °
Spatially oriented resistivity images of borehole wall
GPIT       General Purpose Inclinometry Tool  
DEVI Hole deviation °
HAZI Hole azimuth °
Fx, Fy, Fz Earth’s magnetic field (three orthogonal components) Oe
Ax, Ay, Az Acceleration (three orthogonal components) m/s2
HLDS        Hostile Environment Litho-Density Sonde  
RHOM Bulk density g/cm3
PEFL Photoelectric effect b/e
LCAL Caliper (measure of borehole diameter) Inch
DRH Bulk density correction g/cm3
HNGS            Hostile Environment Natural 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
UBI        Ultrasonic Borehole Imager  
  Spatially oriented acoustic images of borehole wall  
  Acoustic arrival times and amplitudes µs
  Borehole diameter Inch
  Borehole azimuth °
GBM           Göttingen Borehole Magnetometer  
Bx, By, Bz Earth’s magnetic field (three orthogonal components) Bits (tool coordinate system)
Rx, Ry, Rz Tool rotation Bits (converted to degrees)
Nx, Ny Inclination/Deviation Bits (converted to degrees)
T1, T2 Telemetry and gyro temperature Bits (converted to °C)
Fx, Fy, Fz Magnetic field (corrected for tool rotation) nT

For the complete list of acronyms used in IODP and for additional information about tool physics, consult IODP-USIO Science Services, LDEO, at

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