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→Purpose and types
|+ {{table number|1}}Basic open hole tools
|+ {{table number|1}}Basic open hole tools
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! Type
! Type || Devices
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| Correlation and lithology
| rowspan = 3 | Correlation and lithology || Spontaneous potential
| Spontaneous potential
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| Gamma ray
| Gamma ray
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| Photoelectric effect
| Photoelectric effect
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| Resistivity
| rowspan = 3 | Resistivity || Induction
| Induction
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| Laterolog
| Laterolog
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| Microresistivity
| Microresistivity
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| [[Porosity]] and Lithology
| rowspan = 4 | [[Porosity]] and Lithology || Density
| Density
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| Compensated Neutron
| Compensated Neutron
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| Sonic
| Sonic
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| Photoelectric effect
| Photoelectric effect
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| Auxiliary
| rowspan = 4 | Auxiliary || Caliper
| Caliper
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| Formation Tester
| Formation Tester
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| Dipmeter
| Dipmeter
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| Borehole Televiewer
| Borehole Televiewer
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|}