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→Correlation and lithology
| Spontaneous potential (SP) || 6–10 ft || N/A || Well-to-well correlation, estimate ''R''<sub>w</sub> , and indicate [[permeability]] || Does not work in oil-based mud and ''R''<sub>mf</sub> and ''R''<sub>w</sub> must contrast
| Spontaneous potential (SP) || 6–10 ft || N/A || Well-to-well correlation, estimate ''R''<sub>w</sub> , and indicate [[permeability]] || Does not work in oil-based mud and ''R''<sub>mf</sub> and ''R''<sub>w</sub> must contrast
|-
|-
| Gamma ray
| Gamma ray || [[length::2 ft]] || [[length::12 in]] || Well-to-well correlation and estimate ''V''<sub>sh</sub> || Sensitive to hole size changes
| [[length::2 ft]]
| [[length::12 in]]
| Well-to-well correlation and estimate ''V''<sub>sh</sub>
| Sensitive to hole size changes
|-
|-
| Spectral gamma ray
| Spectral gamma ray || [[length::3 ft]] || [[length::16 in]] || Well-to-well correlation and estimate ''V''<sub>sh</sub> || Sensitive to hole size changes
| [[length::3 ft]]
| [[length::16 in]]
| Well-to-well correlation and estimate ''V''<sub>sh</sub>
| Sensitive to hole size changes
|-
|-
| Photoelectrical effect (Pe)
| Photoelectrical effect (Pe) || [[length::2 in]] || [[length::2 in]] || Identify lithology and well-to-well correlation || Does not work in barite mud, is a pad device, and uses a radioactive source
| [[length::2 in]]
| [[length::2 in]]
| Identify lithology and well-to-well correlation
| Does not work in barite mud, is a pad device, and uses a radioactive source
|}
|}