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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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