Table T7. Logging tool and measurement acronyms, and units of measurement.

Tool	Output	Explanation	Units
HNGS		Hostile environment spectral gamma-ray sonde
	HSGR	Total spectral gamma ray	gAPI
	HCGR	Computed uranium-free gamma ray (HSGR-HURA)	gAPI
	HFK	Formation potassium	wt%
	HTHO	Thorium	ppm
	HURA	Uranium	ppm
APS		Accelerator porosity sonde
	APSC	Near array porosity (sandstone corrected)	%
	FPSC	Far array porosity (sandstone corrected)	%
	SIGF	Neutron capture cross section of the formation (Sf)	cu
	STOF	Estimated tool standoff (tool distance from borehole wall)	in
HLDS		Hostile environment lithodensity sonde
	RHOB	Bulk density (corrected)	g/cm3
	PEF	Photoelectric effect factor	barn/e-
	DRHO	Delta-rho (bulk density correction)	g/cm3
	CALI	Caliper (measure of borehole diameter)	in
DITE		Dual induction tool
	IDPH	Phasor induction (deep resistivity)	m
	IMPH	Phasor induction (medium resistivity)	m
	SFLU	Shallow spherically focused resistivity	m
LDEO-TAP		Temperature/acceleration/pressure tool
	T, A, P	Temperature, acceleration, pressure	°C, mm/s2, psi
NGT		Natural gamma-ray spectrometry tool
	SGR	Standard (total) gamma ray	gAPI
	CGR	Corrected gamma ray	gAPI
DSI/LSS		Dipole shear sonic imager or long-spaced sonic imager
	DT	Vp transit time	µs/ft
GPIT		General purpose inclinometer tool
	DEVI	Hole deviation	°
	HAZI	Hole azimuth	°
	P1AZ	Pad One azimuth	°
	C1, C2	Orthogonal hole diameters [Caliper 1, Caliper 2 (from FMS tool)]	in
	FCA(X,Y,Z)	Total acceleration vector components	m/s2
	F(X,Y,Z)	Total magnetic field vector components	oersted
MEST/FMS		Microelectrical resistivity tool or Formation MicroScanner
		Spatially oriented borehole wall resistivity image	NA