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Table T13. Acronyms and units used for downhole wireline tools and measurements, Expedition 346.

Tool Output Description Unit
EDTC         Enhanced digital telemetry cartridge  
GR Total gamma ray gAPI
ECGR Environmentally corrected gamma ray gAPI
EHGR High-resolution environmentally corrected gamma ray gAPI
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
HLDS           Hostile Environment Litho-Density Sonde  
RHOM Bulk density g/cm3
PEFL Photoelectric effect barn/e
LCAL Caliper (measure of borehole diameter) Inch
DRH Bulk density correction g/cm3
HRLA         High-Resolution Laterolog Array  
RLA1-5 Apparent resistivity from computed focusing Mode 1−5 Ωm
RT True resistivity Ωm
MRES Borehole fluid resistivity Ωm
MSS       Magnetic Susceptibility Sonde  
LSUS Magnetic susceptibility, deep reading Uncalibrated units
HSUS Magnetic susceptibility, high resolution Uncalibrated units
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) °
Ax, Ay, Az Acceleration (three orthogonal components) m/s2
DSI           Dipole Shear Sonic Imager  
DTCO Compressional wave slowness µs/ft
DTSM Shear wave slowness µs/ft
DT1 Shear wave slowness, lower dipole µs/ft
DT2 Shear wave slowness, upper dipole µs/ft

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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