Deterministic Simultaneous Inversion Module Overview

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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?

Given their dependence on the AVA response 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?

It ensures accurate seismic amplitudes Signup and view all the answers

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

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

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

Improving the resolution of P-impedance results Signup and view all the answers

Why is simultaneous inversion considered necessary for characterizing reservoirs properly?

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

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

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

What differentiates simultaneous inversion from acoustic inversion?

The objective functions used Signup and view all the answers

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

By considering AVO effects and noise properly Signup and view all the answers

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

By enabling discrimination of gas sand reservoirs Signup and view all the answers

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

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

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

Deviations from the linear trends Signup and view all the answers

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

Minimize seismic-synthetic misfit and capture contrasts Signup and view all the answers

What concept lies behind most inversion algorithms?

Objective function Signup and view all the answers

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

Contrast term Signup and view all the answers

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

Fgardner Signup and view all the answers

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

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

What additional insights can be gained through simultaneous inversion?

Better resolution of reservoir properties Signup and view all the answers

What does simultaneous inversion aim to minimize?

Difference between real seismic and modeled seismic Signup and view all the answers

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

AVA/AVO Signup and view all the answers

What do the Zoeppritz equations describe?

Wave reflection and transmission 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?

Porosity and fluid content Signup and view all the answers

What does Fatti et al.'s approximation simplify?

Zoeppritz equations Signup and view all the answers

What is key to ensuring a robust simultaneous inversion process?

Impedance and density values adjustment Signup and view all the answers

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

To define reflectivity for incident angles Signup and view all the answers

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

Density contrasts Signup and view all the answers

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

'Model based' iterative approach Signup and view all the answers

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

'Model based' elastic layer properties Signup and view all the answers

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

AVA/AVO effect Signup and view all the answers