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! F || S || B || K || O || Excentered || Stand-Off (in.) || Centered
! F || S || B || K || O || Excentered || Stand-Off (in.) || Centered
|-
|-
| [[Basic open hole tools#Spontaneous potential|SP]]
| [[Basic open hole tools#Spontaneous potential|SP]] || — || — || √ || √ || √ || √ || × || √ || √ || √ || NA
| —
| —
| √
| √
| √
| √
| ×
| √
| √
| √
| NA
|-
|-
| [[Basic open hole tools#Gamma ray|Gamma ray]]
| [[Basic open hole tools#Gamma ray|Gamma ray]] || 6 || 20 || √ || √ || √ || √ || √ || √ || – || – || <1800
| 6
| 20
| √
| √
| √
| √
| √
| √
| –
| –
| <1800
|-
|-
| Spectral [[Basic open hole tools#Gamma Ray|GR]]
| Spectral [[Basic open hole tools#Gamma Ray|GR]] || 6 || 20 || √ || √ || √ || NR || √ || √ || NR || – || <900
| 6
|-
| 20
| [[Basic open hole tools#Induction|Induction]] || 6 || 20 || √ || × || √ || × || √ || – || 1.5 || – || <3600
| √
|-
| √
| [[Basic open hole tools#Laterologs|Laterolog]] || 6 || 20 || × || √ || √ || √ || × || – || × || √ || <3600
| √
|-
| NR
| [[Basic open hole tools#Microresistivity|Microresistivity]] || 6 || 16 || √ || √ || √ || √ || × || – || – || √ || <3600
| √
| √
| NR
| –
|
|-
|-
| [[Basic open hole tools#Induction|Induction]]
| [[Basic open hole tools#Density|Density]] || 6 || 16 || √ || √ || √ || √ || √ || √ || 0–2.0 || × || <1800
| 6
| 20
| √
| ×
| √
| ×
| √
| –
| 1.5
| –
|
|-
|-
| [[Basic open hole tools#Laterologs|Laterolog]]
| IPL* || 6 || 16 || √ || √ || √ || √ || √ || √ || 0–2.0 || × || 1800
| 6
| 20
| ×
| √
| √
| √
| ×
| –
| ×
| √
|
|-
|-
| [[Basic open hole tools#Microresistivity|Microresistivity]]
| Photoelectrical || 6 || 16 || √ || √ || × || √ || √ || √ || 0–2.0 || × || <1800
| 6
| 16
| √
| √
| √
| √
| ×
| –
| –
| √
|
|-
|-
| [[Basic open hole tools#Density|Density]]
| [[Basic open hole tools#Compensated neutron|Neutron]] || 6 || 16 || √ || √ || √ || √ || √ || √ || × || × || <1800
| 6
| 16
| √
| √
| √
| √
| √
| √
| 0–2.0
| ×
|
|-
|-
| Photoelectrical
| [[Basic open hole tools#Sonic|Sonic]] || 6 || 20 || √ || √ || √ || √ || √ || – || – || √ || <3600
| 6
| 16
| √
| √
| ×
| √
| √
| √
| 0–2.0
| ×
|
|-
|-
| [[Basic open hole tools#Compensated neutron|Neutron]]
| FWS (monopole) || 6 || 20 || √ || √ || √ || √ || √ || × || × || √ || <1800
| 6
| 16
| √
| √
| √
| √
| √
| √
| ×
| ×
|
|-
|-
| [[Basic open hole tools#Sonic|Sonic]]
| Dipole || 6 || 14 || √ || √ || √ || √ || √ || – || × || √ || <1400
| 6
| 20
| √
| √
| √
| √
| √
| –
| –
| √
|
|-
|-
| FWS (monopole)
| [[Dipmeter]] || 6 || 22 || √ || √ || √ || √ || M || × || × || √ || <3000
| 6
| 20
| √
| √
| √
| √
| √
| ×
| ×
| √
|
|-
|-
| Dipole
| Formation tester || 6 || 16 || √ || √ || √ || √ || √ || NA || NA || NA || NA
| 6
| 14
| √
| √
| √
| √
| √
| –
| ×
| √
|
|-
|-
| Dipmeter
| FMS || 6 || 22 || √ || √ || √ || √ || × || × || × || √ || <1800
| 6
| 22
| √
| √
| √
| √
| M
| ×
| ×
| √
|
|-
|-
| Formation tester
| Televiewer || 6 || 14 || √ || √ || √ || √ || √ || × || × || √ || <1200
| 6
| 16
| √
| √
| √
| √
| √
| NA
| NA
| NA
| NA
|-
|-
| FMS
| FMI || 6 || 21 || √ || √ || √ || √ || × || × || × || √ || <1800
| 6
| 22
| √
| √
| √
| √
| ×
| ×
| ×
| √
|
|-
|-
| Televiewer
| Pulsed neutron || 2 || 12 || √ || √ || √ || √ || √ || √ || – || – || <1800
| 6
| 14
| √
| √
| √
| √
| √
| ×
| ×
| √
|
|-
|-
| Pulsed neutron
| CMR* || 6.5 || 20 ||√ || √ || √ || √ || √ || √ || – || – || 1800
| 2
| 12
| √
| √
| √
| √
| √
| √
| –
| –
|
|}
|}
<sup>a</sup><sub>Symbols: √ = good conditions, × = unsuitable conditions, - = marginally acceptable conditions, NR = not recommended, NA = not applicable, M = with special modifications.</sub><br>
<sup>a</sup><sub>Symbols: √ = good conditions, × = unsuitable conditions, - = marginally acceptable conditions, NR = not recommended, NA = not applicable, M = with special modifications.</sub><br>
<sup>b</sup><sub>Mud types: F = freshwater (low salt), S = high salt, B = barite, K = high potassium salt, O = oil-based.</sub>
<sup>b</sup><sub>Mud types: F = freshwater (low salt), S = high salt, B = barite, K = high potassium salt, O = oil-based.</sub><br>
<sup>*</sup><sub>Mark of Schlumberger</sub><br>
Computerized surface systems and cable communication systems have made tool combinations virtually unlimited. However, the combining of different tools into a single logging run may be limited by more than the physical ability to hook them together. Some devices are designed to operate excentered, some centered, and some stood off from the borehole wall. Tool positioning is important in ensuring valid environmental corrections. Table 1 includes optimum hole positions for each device. Caution should be used in combining a tool designed to be excentered, such as the neutron, with one designed to be centered, such as the sonic. The environmental effects upon the measurement may be uncorrectable. Also note that the maximum and minimum hole sizes are general recommendations only. Some logging devices are modified for larger and smaller holes.
Computerized surface systems and cable communication systems have made tool combinations virtually unlimited. However, the combining of different tools into a single logging run may be limited by more than the physical ability to hook them together. Some devices are designed to operate excentered, some centered, and some stood off from the borehole wall. Tool positioning is important in ensuring valid environmental corrections. Table 1 includes optimum hole positions for each device. Caution should be used in combining a tool designed to be excentered, such as the neutron, with one designed to be centered, such as the sonic. The environmental effects upon the measurement may be uncorrectable. Also note that the maximum and minimum hole sizes are general recommendations only. Some logging devices are modified for larger and smaller holes.
* [http://store.aapg.org/detail.aspx?id=612 Find the book in the AAPG Store]
* [http://store.aapg.org/detail.aspx?id=612 Find the book in the AAPG Store]
[[Category:Wireline methods]] [[Category:Pages with badly formatted tables]]
[[Category:Wireline methods]] [[Category:Pages with badly formatted tables]] [[Category:Methods in Exploration 10]]