mmmTable T4. Measurement acronyms, units, vertical resolutions, and depths of investigation (where available) of wireline logging tools deployed during Expedition 311.
| Tool | Output | Tool name/Explanation of output | Unit | Vertical resolution (cm) | Depth of investigation (cm) |
|---|---|---|---|---|---|
|
APS |
Accelerator Porosity Sonde | ||||
| APLC | Near array porosity (limestone calibrated) | % | 43 | ||
| SIGF | Formation capture cross section | Capture unit | 31 | ||
| STOF | Tool standoff (distance from borehole wall) | inch | |||
|
DIT |
Dual Induction Tool | ||||
| IDPH | Deep induction resistivity |
m |
246 | 122–158 | |
| IMPH | Medium induction resistivity |
m |
185 | 66–79 | |
| SFLU | Spherically focused resistivity |
m |
61 | 41 | |
|
DSI |
Dipole Sonic Imager | ||||
| DTCO | Compressional wave slowness | µs/ft | 107 | ~10 | |
| DTSM | Shear wave slowness | µs/ft | 107 | ~10 | |
| DTST | Stoneley wave slowness | µs/ft | 107 | ~10 | |
|
FMS |
|
Formation MicroScanner | |||
| C1, C2 | Orthogonal hole diameters | inch | |||
| P1AZ | Pad 1 azimuth | Degree | |||
| Oriented resistivity images of borehole wall | 0.5 | 2 | |||
|
GPIT |
General Purpose Inclinometer Tool | ||||
| DEVI | Hole deviation | Degree | |||
| HAZI | Hole azimuth | Degree | |||
| Fx, Fy, Fz | Earth's magnetic field (three orthogonal components) | Oersted | |||
| Ax, Ay, Az | Acceleration (three orthogonal components) | m/s2 | |||
|
HLDT |
Hostile Environment Litho-Density Tool | ||||
| RHOB | Bulk density (corrected) | g/cm3 | 46 | ||
| PEF | Photoelectric effect | b/e– | |||
| CALI | Caliper (borehole diameter) | inch | |||
| DRHO | Bulk density correction | g/cm3 |
|
|
|
|
HNGS |
Hostile Environment Gamma Ray Sonde | ||||
| HSGR | Standard (total) gamma ray | gAPI | 51 | ||
| HCGR | Computed gamma ray (minus uranium contribution) | gAPI | 51 | ||
| HFK | Potassium | wt% | 51 | ||
| HTHO | Thorium | ppm | 51 | ||
| HURA | Uranium | ppm | 51 | ||
|
SGT |
Scintillation Gamma Ray Tool | ||||
| ECGR | Environmentally corrected gamma ray | gAPI | 46 | ||
| TAP | Temperature/Acceleration/Pressure | °C, m/s2, psi | |||
| WST | Well Seismic Tool |
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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