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Line 46: − + − ! Vertical Resolution − ! Radius of Investigation − ! Applications − ! Limitations − + − − − − − + − − − − − + − − − − − + − − − −
→Basic tools
|+ {{table number|2}}Resolutions and limitations of cased hole logging devices
|+ {{table number|2}}Resolutions and limitations of cased hole logging devices
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! Tool
! Tool || Vertical Resolution || Radius of Investigation || Applications || Limitations
|-
|-
| Gamma ray
| Gamma ray || [[length::2 ft]] || [[length::12 in]] || Well-to-well correlation and estimates ''V''<sub>sh</sub> || Affected by radioactive scale near perforations
| [[length::2 ft]]
| [[length::12 in]]
| Well-to-well correlation and estimates ''V''<sub>sh</sub>
| Affected by radioactive scale near perforations
|-
|-
| Spectral gamma ray
| Spectral gamma ray || [[length::3 ft]] || [[length::16 in]] || Well-to-well correlation and estimates ''V''<sub>sh</sub> || —
| [[length::3 ft]]
| [[length::16 in]]
| Well-to-well correlation and estimates ''V''<sub>sh</sub>
| —
|-
|-
| Pulsed neutron
| Pulsed neutron || [[length::2 ft]] || [[length::18 in]] || Determines water saturation and estimates porosity || Does not work in freshwater and severely underestimates porosity in the presence of gas
| [[length::2 ft]]
| [[length::18 in]]
| Determines water saturation and estimates porosity
| Does not work in freshwater and severely underestimates porosity in the presence of gas
|-
|-
| Compensated neutron
| Compensated neutron || [[length::3 ft]] || [[length::10 in]] || Estimates porosity || Severely underestimates porosity in the presence of gas
| [[length::3 ft]]
| [[length::10 in]]
| Estimates porosity
| Severely underestimates porosity in the presence of gas
|}
|}