Gamma Ray Tool Measurement in Geology
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Gamma Ray Tool Measurement in Geology

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Questions and Answers

What is the primary component of a gamma ray tool?

  • A radiation emitter
  • A photomultiplier
  • A scintillation counter (correct)
  • A radiation detector
  • What is the depth of investigation for a gamma ray tool in average drilling mud and formation density conditions?

  • 20 cm
  • 30 cm (correct)
  • 10 cm
  • 40 cm
  • Which of the following is a qualitative use of the gamma ray log?

  • Identifying mineral presence (correct)
  • Calculating porosity
  • Determining permeability
  • Calculating formation pressure
  • What happens to the gamma ray signal if the formation density increases?

    <p>The depth of investigation decreases</p> Signup and view all the answers

    What can be inferred from an increase in gamma ray values at a certain depth?

    <p>The zone below is shalier</p> Signup and view all the answers

    What is the primary purpose of the Gamma Ray Tool Measurement in sedimentary formations?

    <p>To reflect the shale content of the formations</p> Signup and view all the answers

    Which of the following formations would not have low levels of radioactivity according to the Gamma Ray Log?

    <p>Shale</p> Signup and view all the answers

    How is the API unit empirically defined?

    <p>By calibration to a reference well at the University of Houston</p> Signup and view all the answers

    What is the significance of the API scale ranging from 0-150 API, 0-100 API or 0-200 API?

    <p>It reflects the maximum radioactivity in a given well</p> Signup and view all the answers

    Which of the following statements best describes the primary source of gamma ray radiation in the earth?

    <p>The decay of radioactive isotopes of potassium, uranium, and thorium</p> Signup and view all the answers

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