Reservoir Rocks and Core Analysis
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Questions and Answers

How can amorphous silica impact core analysis?

  • It improves gamma-ray interpretation.
  • It results in suppression of resistivity logs. (correct)
  • It enhances the accuracy of porosity measurement.
  • It has no effect on core analysis.

    • What effect can high-potassium forms of K-Feldspars have on gamma-ray interpretation?

  • Enhance the accuracy of gamma-ray interpretation.
  • Confuse gamma-ray interpretation. (correct)
  • Improve core analysis results.
  • Have no effect on gamma-ray interpretation.

    • How does dolomitisation of limestone affect crystal volume?

  • Increases the crystal volume.
  • Has no effect on crystal volume.
  • Makes crystal volume difficult to measure.
  • Reduces the crystal volume resulting in higher porosity. (correct)

    • Why can grain density-based porosity calculations be significantly inaccurate for amorphous silica?

    <p>Because amorphous silica has high water content and a high surface area.</p> Signup and view all the answers

    Which mineral composition can confuse gamma-ray interpretation from down-hole logs?

    <p>K-Feldspars</p> Signup and view all the answers

    What is the impact of chalcedony on resistivity logs in core analysis?

    <p>Causes suppression of resistivity logs.</p> Signup and view all the answers

    What is the impact of opalescent silica on resistivity logs in core analysis?

    <p>Causes suppression of resistivity logs</p> Signup and view all the answers

    How does dolomitisation of limestone impact porosity?

    <p>Decreases crystal volume, increasing porosity</p> Signup and view all the answers

    Which mineral can significantly affect gamma-ray interpretation from down-hole logs due to its high potassium forms?

    <p>K-Feldspars</p> Signup and view all the answers

    Why may grain density-based porosity calculations be significantly erroneous for amorphous silica?

    <p>High water content and surface area of amorphous silica lead to errors in grain density</p> Signup and view all the answers

    Which mineral has little effect on core analysis but can lead to confusion in gamma-ray interpretation due to high potassium forms?

    <p>K-Feldspars</p> Signup and view all the answers

    What impact does amorphous silica have on grain density-based porosity calculations?

    <p>Significant errors due to its high water content and surface area</p> Signup and view all the answers

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