Table T7. Acronyms and units used for downhole wireline tools and measurements. (See table note.)
| Tool | Output | Description | Unit |
|---|---|---|---|
| APS | Accelerator Porosity Sonde | ||
| APLC | Near/Array limestone porosity corrected | % | |
| STOF | Computed standoff | Inch | |
| SIGF | Formation capture cross section | Capture units | |
| DIT | Dual Induction Tool | ||
| IDPH | Deep induction resistivity | Ωm | |
| IMPH | Medium induction resistivity | Ωm | |
| SFLU | Spherically focused resistivity | Ωm | |
| DSI | Dipole Sonic Imager | ||
| DTCO | Compressional wave slowness (Δt) | µs/ft | |
| DTSM | Shear wave slowness (Δt) | µs/ft | |
| FMS | Formation MicroScanner | ||
| C1, C2 | Orthogonal hole diameters | Inch | |
| P1AZ | Pad 1 azimuth | % | |
| Spatially oriented resistivity images of borehole wall | |||
| GPIT | General Purpose Inclinometer Tool | ||
| DEVI | Hole deviation | % | |
| HAZI | Hole azimuth | % | |
| Fx, Fy, Fz | Earth’s magnetic field (three orthogonal components) | % | |
| Ax, Ay, Az | Acceleration (three orthogonal components) | m/s2 | |
| HLDS | Hostile Environment Litho-Density Sonde | ||
| RHOM | Bulk density | g/cm3 | |
| PEFL | Photoelectric effect | b/e– | |
| LCAL | Caliper (measure of borehole diameter) | Inch | |
| DRH | Bulk density correction | g/cm3 | |
| HNGS | Hostile Environment Natural Gamma Ray Sonde | ||
| HSGR | Standard (total) gamma ray | gAPI | |
| HCGR | Computed gamma ray (HSGR minus uranium contribution) | gAPI | |
| HFK | Potassium | wt% | |
| HTHO | Thorium | ppm | |
| HURA | Uranium | ppm | |
| SGT | Scintillation Gamma Ray Tool | ||
| GR | Total gamma ray | gAPI | |
| ECGR | Environmentally-corrected gamma ray | gAPI | |
| EHGR | High-resolution environmentally-corrected gamma ray | gAPI | |
| VSI | Versatile Seismic Imager | ||
| Acoustic travel time | ms |
Note: For the complete list of acronyms used in IODP and for additional information about tool physics, consult IODP-USIO Science Services, LDEO, at iodp.ldeo.columbia.edu/TOOLS_LABS/tools.html.
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