Deterministic Simultaneous Inversion Module Overview
31 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the main advantage of utilizing shear wave information in acoustic inversion?

  • Higher computational efficiency
  • Better separation of lithologies (correct)
  • Increased seismic velocity
  • Improved depth resolution

    • Which attribute alone may not be sufficient to discriminate certain lithologies or fluid content?

  • P-Impedance (correct)
  • Poisson's ratio
  • Shear wave velocity
  • Vp/Vs ratio

    • What role do the Vp/Vs ratio and Poisson's ratio play in lithology/fluid classifications?

  • They are used in a minority of cases
  • They only apply to gas sands
  • They are critical indicators (correct)
  • They are irrelevant in classification

    • Why are the Vp/Vs ratio and Poisson's ratio highly sensitive to the quality of the AVA response?

    <p>Given their dependence on the AVA response</p> Signup and view all the answers

    Why is the stability of the Vp/Vs ratio after elastic inversion considered the ultimate way to quality control pre-stack amplitudes?

    <p>It ensures accurate seismic amplitudes</p> Signup and view all the answers

    What does Simultaneous Inversion allow us to invert for, in addition to P-Impedance?

    <p>Vp/Vs ratio or Poisson's ratio</p> Signup and view all the answers

    What is one of the benefits of simultaneous inversion mentioned in the text?

    <p>Improving the resolution of P-impedance results</p> Signup and view all the answers

    Why is simultaneous inversion considered necessary for characterizing reservoirs properly?

    <p>To distinguish between gas sands and shales based on P-impedance values</p> Signup and view all the answers

    In the context of simultaneous inversion, what do the inverted elastic parameter volumes include?

    <p>P-impedance, S-impedance, and Vp/Vs ratio</p> Signup and view all the answers

    What differentiates simultaneous inversion from acoustic inversion?

    <p>The objective functions used</p> Signup and view all the answers

    Why is it mentioned that simultaneous inversion makes P-impedance results more robust?

    <p>By considering AVO effects and noise properly</p> Signup and view all the answers

    How does combining both inverted attributes (Ip and Vp/Vs) aid in reservoir characterization?

    <p>By enabling discrimination of gas sand reservoirs</p> Signup and view all the answers

    What is one way to reduce the non-uniqueness in pre-stack inversion?

    <p>Assuming a linear fit for the background trend relating P Impedance, S Impedance, and density</p> Signup and view all the answers

    What does the simultaneous inversion process solve for when using linear trends for basic variables?

    <p>Deviations from the linear trends</p> Signup and view all the answers

    What is one key requirement that the final simultaneous inversion model must comply with?

    <p>Minimize seismic-synthetic misfit and capture contrasts</p> Signup and view all the answers

    What concept lies behind most inversion algorithms?

    <p>Objective function</p> Signup and view all the answers

    Which term in the objective function controls the sparsity of the solution in simultaneous inversion?

    <p>Contrast term</p> Signup and view all the answers

    In simultaneous inversion, which term constrains the relationship between density and Vp (velocity of compressional waves)?

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

    What property does 'Fmudrock' term constrain in simultaneous inversion?

    <p>Relationship between Is (Vs/Vp) and Vp (velocity of compressional waves)</p> Signup and view all the answers

    What additional insights can be gained through simultaneous inversion?

    <p>Better resolution of reservoir properties</p> Signup and view all the answers

    What does simultaneous inversion aim to minimize?

    <p>Difference between real seismic and modeled seismic</p> Signup and view all the answers

    What concept is introduced to describe the variation of seismic amplitude with the offset or angle?

    <p>AVA/AVO</p> Signup and view all the answers

    What do the Zoeppritz equations describe?

    <p>Wave reflection and transmission</p> Signup and view all the answers

    Which property can affect rock properties, leading to changes in P&S velocities and subsequently affecting transmission and reflection coefficients?

    <p>Porosity and fluid content</p> Signup and view all the answers

    What does Fatti et al.'s approximation simplify?

    <p>Zoeppritz equations</p> Signup and view all the answers

    What is key to ensuring a robust simultaneous inversion process?

    <p>Impedance and density values adjustment</p> Signup and view all the answers

    What is the purpose of generating synthetic seismic traces in model-based simultaneous inversion?

    <p>To define reflectivity for incident angles</p> Signup and view all the answers

    What do the Fatti approximation's three terms represent in the simplified linear equation?

    <p>Density contrasts</p> Signup and view all the answers

    What is the main requirement for a model-based simultaneous inversion process?

    <p>'Model based' iterative approach</p> Signup and view all the answers

    What does the simultaneous inversion process aim to convert seismic data into?

    <p>'Model based' elastic layer properties</p> Signup and view all the answers

    What is the term used to describe the variation of seismic amplitude with offset or angle?

    <p>AVA/AVO effect</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser