Close Packed Arrays and Porosity Quiz
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Questions and Answers

What is the main reason a 'close packed' array of spheres is considered to be the most efficient way of packing uniform spheres?

  • It has the lowest possible porosity (correct)
  • It is the most visually appealing arrangement
  • It is easier to calculate the porosity
  • It has the highest possible porosity
  • What can be inferred about the porosity of arrangements where spheres are not uniformly arranged?

  • The porosity will remain the same as in a 'close packed' array
  • The porosity will be lower than in a 'close packed' array
  • The porosity cannot be calculated
  • The porosity will be higher than in a 'close packed' array (correct)
  • What happens to porosity as sorting becomes poorer in a model where smaller spheres are introduced between larger spheres?

  • Porosity increases (correct)
  • Porosity remains constant
  • Porosity becomes negative
  • Porosity decreases
  • How does the introduction of plane parallel-sided cracks with a well-defined aperture into a solid block relate to understanding fracture porosity?

    <p>Increases fracture porosity</p> Signup and view all the answers

    What is a key aspect of practical petrophysics according to the text?

    <p>Reliance on highly idealized models</p> Signup and view all the answers

    What is the significance of extending 'close packed' arrays of spheres in all directions?

    <p>To find the optimal packing of uniform spheres</p> Signup and view all the answers

    What is the constant that links flow-rate to the pressure applied to a fluid?

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

    What are the SI units of permeability?

    <p>Square meters</p> Signup and view all the answers

    What is the commonly used unit for permeabilities in the petroleum industry?

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

    What type of reservoirs are often defined as having average permeabilities of less than 0.1 mD?

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

    What type of samples with permeabilities are not unusual in tight gas reservoirs?

    <p>0.01 mD</p> Signup and view all the answers

    What type of systems are often considered when thinking about what controls permeability?

    <p><strong>Highly idealized systems</strong></p> Signup and view all the answers

    What type of packing results in the lowest porosity possible with uniform spherical grains?

    <p>Close packed array</p> Signup and view all the answers

    In the context of porosity, what effect does introducing smaller spheres between larger spheres have on sorting?

    <p>Sorting gets poorer</p> Signup and view all the answers

    Which type of packing arrangement is easier to calculate but has a higher porosity than the 'close packed' array?

    <p>Simple cubic array</p> Signup and view all the answers

    What could be the consequence of elongating the grains in a model based on sphere packing?

    <p>Reduced porosity</p> Signup and view all the answers

    What kind of porosity is expected in arrangements where spheres are not uniformly arranged?

    <p>Higher porosity</p> Signup and view all the answers

    How does the concept of integrating idealized models with real rock experimental results relate to practical petrophysics?

    <p>It enhances understanding</p> Signup and view all the answers

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