Table
T2. Measurements made by wireline tool strings.
logging speed
(m/hr)
interval
(cm)
vertical resolution
(cm)
1
Triple combination
(total length = ~36.05 m)
250-275
HNGS
Spectral gamma ray
15
51
APS
Porosity
5 and 15
43
HLDS
Bulk density, PEF
15
38
DLL
Resistivity
15
61
DIT-E
Resistivity
15
76-200
TAP
Temperature
1 per s
NA
Tool acceleration
4 per s
NA
Pressure
1 per s
NA
2
Formation
MicroScanner (FMS)/sonic combination (total length = ~33.4 m)
250-275
NGT
Spectral gamma ray
15
46
GPIT
Tool orientation
0.25
NA
LSS
Sonic velocity
15
61
FMS
Microresistivity
0.25
0.5
Notes: * = all tool and tool string names except the TAP tool are trademarks of Schlumberger. † = for additional information about tool physics and use consult ODP Logging Services at http://www.ldeo.columbia.edu/BRG/ODP. Tools: HNGS = hostile environment natural gamma ray sonde, APS = accelerator porosity sonde, HLDS = high-temperature lithodensity sonde, DLL = dual laterolog, DIT-E = dual induction tool, TAP = Lamont-Doherty temperature/acceleration/pressure tool, NGT = natural gamma spectrometry tool, GPIT = general purpose inclinometer tool, LSS = long-spaced sonic tool, FMS = Formation MicroScanner. PEF = photoelectric effect. NA = not applicable.