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Table T4. Downhole measurements made by wireline tool strings, Expedition 341.

Tool string Tool Measurement Sampling
interval (cm)
Vertical
resolution (cm)
Triple combo with MSS EDTC Total gamma ray 5 and 15 30
HNGS Spectral gamma ray 15 20–30
HLDS Bulk density, borehole diameter 2.5 and 15 38
APS Neutron porosity 5 and 15 36
HRLA Resistivity 15 30
MSS Magnetic susceptibility (deep reading sensor only) 4 40
FMS-sonic EDTC Total gamma ray 5 and 15 30
DSI Acoustic velocity 15 107
GPIT Tool orientation and acceleration 4 15
FMS Microresistivity, borehole diameter 0.25 0.50
Versatile Seismic Imager VSI One-way acoustic traveltime Stations at 10–50 m NA
EDTC Total gamma ray 5 and 15 30
MSS with HNGS HNGS Spectral gamma ray 15 20–30
MSS Magnetic susceptibility, deep reading sensor (DR) 4 40
Magnetic susceptibility, high resolution sensor (HR) 4 10
Sonic-induction EDTC Total gamma ray 5 and 15 30
HLDS Borehole diameter 15 30
DSI Acoustic velocity 15 107
DIT Resistivity 15.24 150–240

All tool names except MSS are trademarks of Schlumberger. Sampling interval based on optimal logging speed. Acoustic imaging approximate vertical resolution is at 500 kHz. NA = not applicable. For definitions of tool acronyms, see Table T5.

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