Well Log Quality Check for Seismic Inversion

What is the purpose of building a low frequency model in seismic inversion?

To recover absolute acoustic impedance

Why are low frequencies important in seismic inversion?

They enable the recovery of absolute acoustic impedance

What do acoustic impedance logs contain that seismic data lacks?

Full frequency spectrum

Which step is NOT involved in creating a Low Frequency Model?

Identifying the high-frequency components in seismic data Signup and view all the answers

Why can only relative impedances be determined without low frequencies in seismic data?

As a result of band-limitation in seismic data Signup and view all the answers

What role does a low-frequency model serve as in the Model Based inversion process?

Providing a starting point for inversion Signup and view all the answers

What is the reason for only relative impedances being determined without a low-frequency model?

Band-limited nature of seismic data Signup and view all the answers

How can the issue of spurious or non-calibrated data be addressed?

Reviewing the petrophysical editing and calibration of the relevant well Signup and view all the answers

What must be consistent with the geological context?

Spatial variation of elastic properties Signup and view all the answers

When is seismic interval velocity included in the Low Frequency Model?

As secondary data to guide interpolation away from wells Signup and view all the answers

What does including a low-frequency model allow in terms of acoustic impedance recovery?

Recovery of absolute acoustic impedance Signup and view all the answers

How are seismic velocities integrated in the creation of a Low Frequency Model?

As a primary component when well logs are unavailable Signup and view all the answers

What is a key consideration when building a good low frequency model?

Editing and correlating selected wells Signup and view all the answers

In Low Frequency Model creation, what is the purpose of determining the structural or stratigraphic grid framework?

To define an area representative grid Signup and view all the answers

When interpolating low-frequency well data between consecutive horizons, what should be considered if the seismic events are parallel to the base horizon?

Thickness following base horizon with constant thickness Signup and view all the answers

How can we estimate the low frequency needed in the Low Frequency Model?

Filtering logs to retain information not captured by seismic data Signup and view all the answers

What is the main purpose of applying a low pass filter to seismic sections?

To check for consistent amplitudes in seismic data Signup and view all the answers

Why is it necessary to establish a well-defined structural grid in Low Frequency Model building?

To ensure geological contrasts align with seismic reflectors Signup and view all the answers

Which step is NOT involved in creating a Low Frequency Model?

Velocity analysis Signup and view all the answers

Why are decisions needed regarding extrapolation above the shallowest log point and below the deepest log point when building a Low Frequency Model?

Because well logs rarely extend to the surface or penetrate to depth. Signup and view all the answers

What is a key consideration when using seismic velocities as an external drift?

Ensuring coherence with well velocities Signup and view all the answers

In the context of interpolation methods, what does Kriging rely on to control spatial correlation?

Variograms Signup and view all the answers

What is a variogram used for in geostatistics?

Analyzing spatial variability and correlation Signup and view all the answers

What do isotropic variograms have in common?

Equal ranges in all directions Signup and view all the answers

Why is it important to choose variogram parameters based on geology and structures?

To account for fault directions and sizes Signup and view all the answers

What should be checked before inversion to ensure the final result depends greatly on the initial model?

Vertical variation Signup and view all the answers

What is the primary function of Low Frequency Model interpolation?

To interpolate filtered well logs within a grid Signup and view all the answers

Which factor influences the choice between isotropic and anisotropic variograms?

Fault direction and block size Signup and view all the answers

'Collocated co-kriging' uses which type of variable as a trend in interpolation?

'Seismic velocity' Signup and view all the answers

'Inverse distance interpolation' and 'Kriging' are common techniques for what process?

'Interpolating filtered well logs' Signup and view all the answers

Well Log Quality Check for Seismic Inversion

Questions and Answers

What is the purpose of building a low frequency model in seismic inversion?

Why are low frequencies important in seismic inversion?

What do acoustic impedance logs contain that seismic data lacks?

Which step is NOT involved in creating a Low Frequency Model?

Why can only relative impedances be determined without low frequencies in seismic data?

What role does a low-frequency model serve as in the Model Based inversion process?

What is the reason for only relative impedances being determined without a low-frequency model?

How can the issue of spurious or non-calibrated data be addressed?

What must be consistent with the geological context?

When is seismic interval velocity included in the Low Frequency Model?

What does including a low-frequency model allow in terms of acoustic impedance recovery?

How are seismic velocities integrated in the creation of a Low Frequency Model?

What is a key consideration when building a good low frequency model?

In Low Frequency Model creation, what is the purpose of determining the structural or stratigraphic grid framework?

When interpolating low-frequency well data between consecutive horizons, what should be considered if the seismic events are parallel to the base horizon?

How can we estimate the low frequency needed in the Low Frequency Model?

What is the main purpose of applying a low pass filter to seismic sections?

Why is it necessary to establish a well-defined structural grid in Low Frequency Model building?

Which step is NOT involved in creating a Low Frequency Model?

Why are decisions needed regarding extrapolation above the shallowest log point and below the deepest log point when building a Low Frequency Model?

What is a key consideration when using seismic velocities as an external drift?

In the context of interpolation methods, what does Kriging rely on to control spatial correlation?

What is a variogram used for in geostatistics?

What do isotropic variograms have in common?

Why is it important to choose variogram parameters based on geology and structures?

What should be checked before inversion to ensure the final result depends greatly on the initial model?

What is the primary function of Low Frequency Model interpolation?

Which factor influences the choice between isotropic and anisotropic variograms?

'Collocated co-kriging' uses which type of variable as a trend in interpolation?

'Inverse distance interpolation' and 'Kriging' are common techniques for what process?

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