Table T4. 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 | gAPI | |
| HCGR | Computed gamma-ray (HSGR - uranium contribution) | gAPI | |
| HFK | Formation potassium | wt% | |
| HTHO | Thorium | ppmv | |
| HURA | Uranium | ppmv | |
| NGT | Natural gamma-ray tool | ||
| SGR | Standard total gamma ray | gAPI | |
| CGR | Computed gamma-ray (SGR - uranium contribution) | gAPI | |
| POTA | Potassium | wt% | |
| THOR | Thorium | ppmv | |
| URAN | Uranium | ppmv | |
| 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) | c. units | |
| 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-SFL | Dual induction tool-spherically focused log | ||
| IDPH | Deep induction phasor-processed resistivity | Wm | |
| IMPH | Medium induction phasor-processed resistivity | Wm | |
| SFLU | Shallow spherically focused resistivity | Wm | |
| GHMT | Geological high-resolution magnetic tool | ||
| MAGS | Magnetic susceptibility (limited range) | IU | |
| RMGS | Low resolution magnetic susceptibility (wider range) | IU | |
| MAGC | Earth conductivity | IU | |
| MAGB | Earth total magnetic field | nT | |
| DSI | Dipole sonic imager | ||
| DT 1S | Shear slowness | ms/f | |
| DT 2S | Shear slowness | ms/f | |
| DT 4P | Compressional slowness | ms/f | |
| FMS | Formation MicroScanner | ||
| C1, C2 | Caliper | cm | |
| LDEO-TAP | Lamont-Doherty temperature/acceleration/pressure tool | °C, mm/s2, psi | |
| GPIT | General-purpose inclinometer tool | ||
| DEVI | Hole deviation from vertical | ° | |
| HAZI | Azimuth of deviation | ° |
Notes: gAPI = American Petroleum Institute unit of measurement for gamma ray. IU = instrument units.