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Resistivity Logs

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Questions and Answers

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?

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?

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?

Sonic logs Signup and view all the answers

Which type of resistivity log measures the formation resistivity using a current that is injected into the formation?

Induction logs Signup and view all the answers

Which type of resistivity log is commonly used for high-resolution imaging of the formation?

Microresistivity logs Signup and view all the answers

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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Description

Test your knowledge on resistivity logs and their importance in well logging. Answer questions about the purpose of resistivity logs, accurate statements about them, and the method of measuring them in a wellbore.