Table T8. Logging tool and measurement acronyms.

Table T8. Logging tool and measurement acronyms.

Tool string

Tool

Output

Physical significance

Unit

Geophysical: HNGS*
Hostile-environment natural gamma ray sonde

HSGR Standard (total) gamma ray gAPI

HCGR Computed gamma ray (HSGR minus uranium contribution) gAPI

HFK Formation potassium Fraction

HTHO Thorium ppm

HURA Uranium ppm

APS*
Accelerator porosity sonde

APLC Near array porosity (limestone corrected) Fraction

FPLC Far array porosity (limestone corrected) Fraction

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

STOF Tool standoff (computed distance from borehole wall) in

HLDS*
Hostile-environment lithodensity sonde

RHOM Bulk density (corrected) g/cm³

PEF Photoelectric effect barn/e^-

LCAL Caliper-measure of borehole diameter in

DRH Bulk density correction g/cm³

DITE-SFR*
Phasor dual induction-spherically focused resistivity tool

IDPH Deep induction phasor-processed resistivity m

IMPH Medium induction phasor-processed resistivity m

SFLU Shallow spherically focused resistivity m

TAP
High-resolution temperature/acceleration/pressure tool °C, m/s², psi

FMS/Sonic: NGT*
Natural-gamma spectrometry tool

SGR Standard (total) gamma ray gAPI

CGR Computed gamma ray (SGR minus uranium contribution) gAPI

POTA Potassium wet wt%

THOR Thorium ppm

URAN Uranium ppm

DSI*
Dipole shear sonic imager

DTCO Compressional wave transit time µs/ft

DTSM Shear wave transit time µs/ft

DTST Stoneley wave transit time µs/ft

GPIT*
General purpose inclinometer tool

FX, FY, FZ Magnetic field (three orthogonal directions) Oersted

AX, AY, AZ Acceleration (three orthogonal directions) m/s²

FMS*
Formation MicroScanner

Oriented images of borehole wall microresistivity m

Tool string	Tool	Output	Physical significance	Unit
Geophysical:	HNGS*		Hostile-environment natural gamma ray sonde
		HSGR	Standard (total) gamma ray	gAPI
		HCGR	Computed gamma ray (HSGR minus uranium contribution)	gAPI
		HFK	Formation potassium	Fraction
		HTHO	Thorium	ppm
		HURA	Uranium	ppm
	APS*		Accelerator porosity sonde
		APLC	Near array porosity (limestone corrected)	Fraction
		FPLC	Far array porosity (limestone corrected)	Fraction
		SIGF	Neutron-capture cross section of the formation (Sf)	cu
		STOF	Tool standoff (computed distance from borehole wall)	in
	HLDS*		Hostile-environment lithodensity sonde
		RHOM	Bulk density (corrected)	g/cm³
		PEF	Photoelectric effect	barn/e^-
		LCAL	Caliper-measure of borehole diameter	in
		DRH	Bulk density correction	g/cm³
	DITE-SFR*		Phasor dual induction-spherically focused resistivity tool
		IDPH	Deep induction phasor-processed resistivity	m
		IMPH	Medium induction phasor-processed resistivity	m
		SFLU	Shallow spherically focused resistivity	m
	TAP		High-resolution temperature/acceleration/pressure tool	°C, m/s², psi
FMS/Sonic:	NGT*		Natural-gamma spectrometry tool
		SGR	Standard (total) gamma ray	gAPI
		CGR	Computed gamma ray (SGR minus uranium contribution)	gAPI
		POTA	Potassium	wet wt%
		THOR	Thorium	ppm
		URAN	Uranium	ppm
	DSI*		Dipole shear sonic imager
		DTCO	Compressional wave transit time	µs/ft
		DTSM	Shear wave transit time	µs/ft
		DTST	Stoneley wave transit time	µs/ft
	GPIT*		General purpose inclinometer tool
		FX, FY, FZ	Magnetic field (three orthogonal directions)	Oersted
		AX, AY, AZ	Acceleration (three orthogonal directions)	m/s²
	FMS*		Formation MicroScanner
			Oriented images of borehole wall microresistivity	m

Note: * = Schlumberger trademark tools.