Previous   |   Close

Table T13. Acronyms and units used for downhole wireline tools and measurements. (See table notes.)

Tool Output Explanation Unit
DIT-E   Dual Induction Tool  
IDPH Deep induction resistivity Ω·m
IMPH Medium induction resistivity Ω·m
SFLU Spherically focused resistivity Ω·m
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 °
  Spatially oriented resistivity images of borehole wall  
GPIT   General Purpose Inclinometer 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 Gamma Ray Sonde  
HSGR Standard (total) gamma ray gAPI
HCGR Computed gamma ray (HSGR minus uranium contribution) gAPI
HFK Potassium (K) wt%
HTHO Thorium (Th) ppm
HURA Uranium (U) ppm
MGT   Multi-Sensor Spectral Gamma Ray Tool  
GR Total gamma radiation gAPI
MSS   Magnetic Susceptibility Sonde  
MSSLSUS Magnetic susceptibility, low resolution SI units
MSSHSUS Magnetic susceptibility, high resolution SI units
MSSLCON Electrical conductivity SI units
SGT-N   Scintillation Gamma Ray Tool  
GR Total gamma ray gAPI
ECGR Environmentally corrected gamma ray gAPI
EHGR High-resolution environmentally corrected gamma ray gAPI

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

Previous   |   Close   |   Top of page