Table T9.

Table T9. Logging tool and measurement acronyms, and units of measurement.

Tool Output Explanation Units

HNGS

Hostile environment natural gamma-ray sonde

HSGR
Standard (total) gamma ray
API

HCGR
Computed gamma ray (HSGR-HURA)
API

HFK
Formation potassium
%

HTHO
Thorium
ppm

HURA
Uranium
ppm

NGT-C

Natural gamma-ray spectrometry tool

SGR
Standard (total) gamma ray
API

CGR
Corrected gamma ray (SGR-URAN)
API

POTA
Potassium
%

THOR
Thorium
ppm

URAN
Uranium
ppm

APS

Accelerator porosity sonde

APLC
Near array porosity (limestone corrected)
%

FPLC
Far array porosity (limestone corrected)
%

SIGF
Neutron capture cross section of the formation (Sf)
cu

STOF
Computed standoff (tool distance from borehole wall)
in

HLDS

Hostile environment lithodensity sonde

RHOB
Bulk density (corrected)
g/cm³

PEF
Photoelectric effect
barn/e^-

CALI
Caliper (measure of borehole diameter)
in

DRHO
Bulk density correction
g/cm³

DITE-SFL

Phasor dual induction tool - spherically focused log

IDPH
Phasor deep induction (deep resistivity)
m

IMPH
Phasor medium induction (medium resistivity)
m

SFLU
Spherically focused log uncorrected (shallow resistivity)
m

LDEO-TAP

Temperature/acceleration/pressure tool

T, A, P
Temperature, acceleration, pressure
°c, mm/s², psi

SDT-C

Sonic digital tool

DTCO
Compressional transit time (computed "slowness")
µs/ft

DT (L, LN, LF)
Transit time (analog "slowness")
µs/ft

LTT (1-4)
Transit time (long spacing)
µs

TT (1-4)
Transit time (short spacing)
µs

ITT
Integrated transit time
s

GPIT

General-purpose inclinometer tool

A (X, Y, Z)
Acceleration on X, Y, and Z axis
ft/s²

FINC
Inclination
°

DEVI
Deviation
°

C1, C2
Caliper 1, Caliper 2 (from FMS tool)
in

P1AZ
Pad One azimuth
°

GHMT

Geologic high-resolution magnetic tool

MAGS
Magnetic susceptibility (limited range)
ppm

RMGS
Low resolution magnetic susceptibility (wider range)
ppm

WST

Well seismic tool

t
Acoustic traveltimes
ms

Tool	Output	Explanation	Units
HNGS		Hostile environment natural gamma-ray sonde
	HSGR	Standard (total) gamma ray	API
	HCGR	Computed gamma ray (HSGR-HURA)	API
	HFK	Formation potassium	%
	HTHO	Thorium	ppm
	HURA	Uranium	ppm
NGT-C		Natural gamma-ray spectrometry tool
	SGR	Standard (total) gamma ray	API
	CGR	Corrected gamma ray (SGR-URAN)	API
	POTA	Potassium	%
	THOR	Thorium	ppm
	URAN	Uranium	ppm
APS		Accelerator porosity sonde
	APLC	Near array porosity (limestone corrected)	%
	FPLC	Far array porosity (limestone corrected)	%
	SIGF	Neutron capture cross section of the formation (Sf)	cu
	STOF	Computed standoff (tool distance from borehole wall)	in
HLDS		Hostile environment lithodensity sonde
	RHOB	Bulk density (corrected)	g/cm³
	PEF	Photoelectric effect	barn/e^-
	CALI	Caliper (measure of borehole diameter)	in
	DRHO	Bulk density correction	g/cm³
DITE-SFL		Phasor dual induction tool - spherically focused log
	IDPH	Phasor deep induction (deep resistivity)	m
	IMPH	Phasor medium induction (medium resistivity)	m
	SFLU	Spherically focused log uncorrected (shallow resistivity)	m
LDEO-TAP		Temperature/acceleration/pressure tool
	T, A, P	Temperature, acceleration, pressure	°c, mm/s², psi
SDT-C		Sonic digital tool
	DTCO	Compressional transit time (computed "slowness")	µs/ft
	DT (L, LN, LF)	Transit time (analog "slowness")	µs/ft
	LTT (1-4)	Transit time (long spacing)	µs
	TT (1-4)	Transit time (short spacing)	µs
	ITT	Integrated transit time	s
GPIT		General-purpose inclinometer tool
	A (X, Y, Z)	Acceleration on X, Y, and Z axis	ft/s²
	FINC	Inclination	°
	DEVI	Deviation	°
	C1, C2	Caliper 1, Caliper 2 (from FMS tool)	in
	P1AZ	Pad One azimuth	°
GHMT		Geologic high-resolution magnetic tool
	MAGS	Magnetic susceptibility (limited range)	ppm
	RMGS	Low resolution magnetic susceptibility (wider range)	ppm
WST		Well seismic tool
	t	Acoustic traveltimes	ms

Note: FMS = Formation MicroScanner, API = American Petroleum Institute.