2 – Logging Tools – Resistivity


This course continues coverage of basic petrophysical analysis with a review of logs used to determine resistivity or correlation of rock formations.

You will learn the basic physics and operating principle behind each tool, the common log displays, and limitations of each tool.

Tools are described in their generic form and specific service companies may offer variations on the basic design concepts.

Knowledge of tool theory is especially important when things don’t appear to be “going right”. Many log analyses fail because the tool’s limitations or operating environment were exceeded. You need to know when and where the data will be valid.

Who Should take this course:
Managers, geologists, log analysts, geophysicists, reservoir engineers, completion engineers, stimulation engineers, and university / tech school students who wish to become proficient in petrophysical analysis or who need to manage or make use of petrophysical results will benefit from this course.




  • Provides basic physics and basic operating concepts
  • Shows common displays of logs and how to identify each curve.
  • Shows how to read logs (e.g. bed boundaries, which log curve is best to use).
  • Gives limitations, common pitfalls (borehole condition, mud system, invasion, mud cake effects).

Lecture Contents:

  • Electrical Survey
  • Spontaneous Potential
  • Induction Logs
  • Laterologs
  • Micrologs and Microlaterologs
  • Gamma Ray Logs
  • Caliper Logs
  • Thermal Decay Time Logs


Basic understanding of quantitative Petrophysics or equivalent background.
Basic understanding of high school level physics is helpful but not required.

Estimated Length:

1 hr video lectures

1hr reading + quiz


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