Table T8. Logging acronyms and measurements.

Measurements	Data channel	Tool acronym	Method	Units	Vertical resolution (cm)	Vertical sampling (cm)	Depth of investigation (cm)
Electrical properties
Resistivity	IDPH	DIT	Deep induction	m	200	15	120-150
	IMPH	DIT	Medium induction	m	150	15	60-80
	SFLU	DIT	Shallow spherically focused current	m	75	15	30-40
Microelectrical images	MEST		Button resistivity		0.5	0.25	~5
Density-porosity
Density	RHOM	HLDS	Formation density (gamma ray scattering)	g·cm-3	40	15	20
	DRH	HLDS	Density correction (<0.25g/cm3 for good data)	g·cm-3	40	15	20
Photoelectric effect	PEFL	HLDS	<200 KeV gamma ray	barns/e-	40	15	20
	PEFS	HLDS	<200 KeV gamma ray	barns/e-	15	15	10
Porosity	APLC	APS	Porosity by neutrons backscattering (near/array)	#	30	15	20
	HALC	APS	Neutrons backscattering (near/array)	#	20	5	20
	FPLC	APS	Neutrons backscattering (far/array)	#	60	15	50
	HFLC	APS	Neutrons backscattering (far/array)	#	30	5	50
Sigma	SIGF	APS	Thermal neutron capture rate	cu	30	15	20
	HSIG	APS	Thermal neutron capture rate	cu	30	5	20
Stand off	STOF	APS	Epithermal neutron (<3 cm for good data)	in	30	15	20
	HSTO	APS	Epithermal neutron (<3 cm for good data)	in	30	5	20
Sound waves
Traveltime	LTT1-4	SDT	10-, 8-, 12-, and 10-ft source-receivers spacings	µs	240-360	15	1-30
	TT1-4	SDT	5-, 3-, 7-, and 5-ft source-receivers spacings	µs	90-150	15	1-15
Slowness	DTLF	SDT	12- and 10-ft source-receivers spacings	µs·ft-1	61	15	1-30
	DTLN	SDT	10- and 8-ft source-receivers spacings	µs·ft-1	61	15	1-30
	DTL	SDT	7- and 5-ft source-receivers spacings	µs·ft-1	61	15	1-15
	DT	SDT	5- and 3-ft source-receivers spacings	µs·ft-1	61	15	1-15
	DTCO	SDT	1/Vp from array receivers	µs·ft-1	107	15	1-30
	DTSM	SDT	1/Vs from array receivers	µs·ft-1	107	15	1-30
Waveforms	WF1-4	SDT	Either LTT or TT spacings	#	90-360	15	1-30
	PWF0	SDT	eight array receivers packed (not on depth)	#	90-360	15	1-30
Ultrasonic images		UBI	Rotating transducer + receiver		0.5	0.5	0
Traveltime	TTBN	UBI	Eccentering corrected traveltime	µs	0.5	0.5	0
Attenuation	AWBN	UBI	Eccentering corrected amplitude	dB	0.5	0.5	0
Temperature
Tool	ITEM	DIT	Tool internal temperature	° C	NA	15	0
Borehole fluid	TF	TLT	Thermistors in borehole fluid	° C	NA	NA	0
	TS
Fluid pressure	PT	TLT	Gauge in borehole fluid	psi	NA	NA	0
Natural gamma ray	SGR	NGT	Total gamma ray count	GAPI	45	15	30-50
	CGR	NGT	Total gamma ray count minus Uranium	GAPI	45	15	30-50
	URAN and THOR	NGT	U and Th by spectral gamma ray	ppm	45	15	30-50
	POTA	NGT	K by spectral gamma ray	#	45	15	30-50
	HSGR	HNGS	Total gamma ray count	GAPI	45	15	30-50
	HCGR	HNGS	Total gamma ray count minus Uranium	GAPI	45	15	30-50
	HURA and HTHO	HNGS	U and Th by spectral gamma ray	ppm	45	15	30-50
	HFK	HNGS	Formation K by spectral gamma ray	#	45	15	30-50
	HBK	HNGS	Borehole fluid K by spectral gamma ray	#	45	15	30-50
Borehole geometry
Diameter	LCAL	HLDS	Caliper	in	45	15	0
	C1 and C2	FMS	Caliper	in	10	3.8-15	0
Radii	IRBC	UBI	Corrected radii	in	0.5	0.5	0
Deviation	DEVI	GPIT	Deviation from accelerometer	degrees	3000	15	NA
Azimuth	HAZI	GPIT	Azimuth from magnetometer and accelerometer	degrees	3000	15	NA
Magnetic field
Components	FX, FY, and FZ	GPIT	Three-components magnetometer	Oer	15	3.8-15	0
Magnitude	FNOR	GPIT	Three-components magnetometer	Oer	15	3.8-15	0
Inclination	FINC	GPIT	Three-components magnetometer	degrees	15	3.8-15	0
Tool dynamics
Pad 1 azimuth	P1AZ	GPIT	Azimuth from magnetometer	degrees	5	3.8-15	NA
Relative bearing	RB	GPIT	Pad 1angle with upper hole side from accelerometer	degrees	5	3.8-15	NA
Acceleration	AX, AY, AZ, and AN	GPIT	Three-components accelerometer	m·s-2	4	3.8-15	NA
Cable tension	TENS	LEH-QT	Strain gauge	lb	NA	15	NA

Notes: Acronyms are defined in "Downhole Measurements" # = nondimensional. NA = not applicable.