Table T8. Schlumberger tool and measurement acronyms.
| Tool | Tool name and output | Explanation | Units |
|---|---|---|---|
HNGS |
Hostile environment natural gamma 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 |
|
NGT |
Natural gamma tool |
||
SGR |
Standard (total) gamma ray |
gAPI |
|
CGR |
Computed gamma ray (SGR minus uranium contribution) |
gAPI |
|
POTA |
Potassium |
Percent |
|
THOR |
Thorium |
ppm |
|
URAN |
Uranium |
ppm |
|
APS |
Accelerator porosity sonde |
||
APLC |
Near/array porosity (limestone corrected) |
Fraction |
|
FPLC |
Near/far porosity (limestone corrected) |
Fraction |
|
SIGF |
Neutron capture cross section of the formation (Sf) |
Capture units |
|
STOF |
Tool standoff (computed distance from borehole wall) |
Inches |
|
HLDS |
Hostile environment lithodensity sonde |
||
RHOM |
Bulk density (corrected) |
g/cm3 |
|
PEFL |
Photoelectric effect |
Barns/e- |
|
LCAL |
Caliper (borehole diameter) |
Inches |
|
DRH |
Bulk density correction |
g/cm3 |
|
DIT |
Dual induction tool |
||
IDPH |
Deep induction phasor-processed resistivity |
Wm |
|
IMPH |
Medium induction phasor-processed resistivity |
Wm |
|
SFLU |
Spherically focused resistivity |
Wm |
|
SUMS |
Susceptibility magnetic sonde |
||
MAGS |
Magnetic susceptibility (limited range) |
ppm |
|
RMGS |
Low-resolution magnetic susceptibility (wider range) |
ppm |
|
MAGC |
Earth conductivity |
ppm |
|
NMRS |
Nuclear magnetic resonance sonde |
||
MAGB |
Earth total magnetic field |
nT |
|
SDT |
Digital sonic tool |
||
LTT1-4 |
Transit times (10-, 8-, 12-, 10-ft transmitter-receiver spacings) |
µs |
|
DTLF |
Slowness (12 minus 10-ft traveltimes) |
µs/ft |
|
DTLN |
Slowness (10 minus 8-ft traveltimes) |
µs/ft |
|
FMS |
Formation MicroScanner |
||
GPIT |
General purpose inclinometry tool |
||
WST |
Well seismic tool |
Note: The IPLT (integrated porosity-lithology tool) is composed of the HNGS, APS, and HLDS.