Gassmann's Theory Quiz

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Questions and Answers

What did Fritz Gassmann's theoretical work in 1951 provide equations for?

  • Estimating the effective elastic properties of a porous rock (correct)
  • Estimating the porosity of a dry rock modulus
  • Estimating the bulk modulus of fluids in a rock
  • Estimating the concentration of minerals in a porous rock

How many input parameters are required to estimate the effective bulk modulus for a monomineral porous rock saturated with fluid?

  • 4 (correct)
  • 2
  • 3
  • 5

What is the purpose of including the 'dry rock' bulk modulus as an input parameter in Gassmann's model?

  • To account for the drained rock's effective bulk modulus (correct)
  • To calculate the rock's elastic parameters
  • To estimate the rock's porosity accurately
  • To determine the fluid concentration in the rock

Which parameter is crucial to distinguish from the bulk modulus of the mineral part in Gassmann's theory?

<p>Dry rock bulk modulus (A)</p> Signup and view all the answers

According to Gassmann's theory, what are the first three parameters required to estimate the effective bulk modulus for a monomineral porous rock saturated with fluid?

<p>Porosity, Bulk modulus of mineral part, Bulk modulus of fluid (D)</p> Signup and view all the answers

What concept does Gassmann's theory help with in terms of porous rocks' elastic properties?

<p>Relating effective elastic properties to components and framework stiffness (B)</p> Signup and view all the answers

What is assumed about the effective shear modulus in saturated rock according to the text?

<p>It is equal to the shear modulus of the dry rock. (C)</p> Signup and view all the answers

Why does Gassmann's theory have certain limitations, as per the text?

<p>It assumes fluid movement due to pressure gradient. (A)</p> Signup and view all the answers

How does the stiffness of the framework relate to the energy of deformation it holds?

<p>The stiffer the framework, the more energy of deformation it holds. (C)</p> Signup and view all the answers

What is a key difficulty in estimating Bulk and Shear moduli of the 'dry rock,' as mentioned in the text?

<p>Variability in pore geometry and grain contacts. (A)</p> Signup and view all the answers

In what situations may Gassmann's theory not accurately predict the elastic behavior of rocks?

<p>When frequencies are high and media is extremely permeable. (B)</p> Signup and view all the answers

Why is it sometimes possible to estimate 'Kdry' parameters implicitly, without creating a detailed rock physics model for drained rock?

<p>To avoid the need for detailed estimation of drained rock properties. (B)</p> Signup and view all the answers

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