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Questions and Answers
Which of the following statements about resistivity logs is most accurate?
Which of the following statements about resistivity logs is most accurate?
- Resistivity logs are used to measure the electrical resistance of the formation. (correct)
- Resistivity logs are used to measure the permeability of the formation.
- Resistivity logs are used to measure the porosity of the formation.
- Resistivity logs are used to measure the lithology of the formation.
What is the main purpose of using resistivity logs in well logging?
What is the main purpose of using resistivity logs in well logging?
- To estimate the temperature of the formation.
- To assess the structural integrity of the wellbore.
- To determine the depth of the formation.
- To identify the presence of hydrocarbons. (correct)
How are resistivity logs measured in a wellbore?
How are resistivity logs measured in a wellbore?
- By measuring the temperature gradient within the wellbore.
- By sending electrical currents through the formation and measuring the voltage. (correct)
- By analyzing the acoustic signals reflected from the formation.
- By using gamma-ray detectors to measure the radioactivity of the formation.
Which of the following is NOT one of the four groups that resistivity logs are classified into?
Which of the following is NOT one of the four groups that resistivity logs are classified into?
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Which type of resistivity log measures the formation resistivity using a current that is injected into the formation?
Which type of resistivity log measures the formation resistivity using a current that is injected into the formation?
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Which type of resistivity log is commonly used for high-resolution imaging of the formation?
Which type of resistivity log is commonly used for high-resolution imaging of the formation?
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Study Notes
Resistivity Logs
- Measure the ability of a formation to conduct electrical current
- High resistivity indicates poor conductivity
- Useful for identifying hydrocarbon-bearing zones because hydrocarbons are electrically resistive
Purpose of Resistivity Logs
- Characterize the rock formations in the wellbore
- Identify potential hydrocarbon-bearing zones
- Determine the type and quantity of hydrocarbons
- Evaluate formation water salinity
Measurement of Resistivity Logs
- A current is passed between electrodes in the wellbore
- The voltage drop between other electrodes is measured
- Formation resistivity is calculated from Ohm's Law
Resistivity Log Classification
- Induction Logs
- Laterolog Logs
- Microresistivity Logs
- Dual Laterolog Logs
Not a Resistivity Log Classification
- Gamma Ray Logs
Formation Resistivity Measurement with Injected Current
- Laterolog Logs
High-Resolution Imaging Resistivity Log
- Microresistivity Logs
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