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Table T24. Acronyms and units used for wireline logging tools.

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

FPLC Far array porosity (limestone calibrated) %

APLC Near array porosity (limestone calibrated) %

SIGF Formation capture cross section (Σf) Capture units

STOF Tool standoff (computed distance from borehole wall) Inches
DSI
Dipole 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


Spatially oriented resistivity images of borehole wall
GPIT
General Purpose Inclinometer Tool

DEVI Hole deviation Degrees

HAZI Hole azimuth Degrees

RB Relative bearing Degrees

P1ZA Pad 1 azimuth Degrees

ANOR Acceleration computer norm m/sec2

FINC Magnetic field inclination Degrees

FNOR Intensity of the total magnetic field oers
HLDS
Hostile Environment Litho-Density Sonde

RHOM Bulk density g/cm3

PEFL Photoelectric effect b/e

LCAL Caliper (measure of borehole diameter) Inches

DRH Bulk density correction g/cm3

DPO Density porosity %
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
LEH-MT
Logging Equipment Head—Mud Temperature

SP Spontaneous potential mV

CTEM Temperature Degrees

DHF Downhole force N
QAIT
SlimXtreme Array Induction Tool

AIT10 Resistivity with a median radial depth of investigation of 10 inches Ω·m

AIT20 Resistivity with a median radial depth of investigation of 20 inches Ω·m

AIT30 Resistivity with a median radial depth of investigation of 30 inches Ω·m

AIT60 Resistivity with a median radial depth of investigation of 60 inches Ω·m

AIT90 Resistivity with a median radial depth of investigation of 90 inches Ω·m
SGT
Scintillation Gamma Ray Tool

GR Total gamma ray gAPI

ECGR Environmentally corrected total gamma ray gAPI

EHGR High-resolution environmentally corrected total gamma ray gAPI
UBI
Ultrasonic Borehole Imager

FTDE Internal radius Inches

TTBK Transit times µs

AWAV Amplitude average db

Notes: All tool and tool string names presented in this table are trademarks of Schlumberger. For the complete list of acronyms used in IODP and for additional information consult IODP Downhole Logging Tools at iodp.ldeo.columbia.edu/TOOLS_LABS/tools.html.

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