Wavelet Amplitude Analysis Quiz

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What is the primary objective of seismic data processing for AVO analysis?

To distort the data with processing artifacts

To introduce noise effects into the data

To estimate and compensate for energy losses in seismic waves (correct)

To enhance the effects of near-surface disturbances

According to Chopra and Castagna, what are the three basic types of phenomena that distort amplitudes in the pre-stack domain?

Energy losses, noise contamination, and seismic wave distortions

Wave propagation effects, noise effects, and near-surface effects (correct)

Reservoir effects, acquisition artifacts, and processing anomalies

Geologic effects, acquisition effects, and processing artifacts

What characterizes amplitude-preserved or amplitude-controlled processing for seismic data?

Enhancing processing artifacts in the data

Amplifying the effects of near-surface disturbances

Introducing more noise into the data

Estimating and compensating for energy losses in seismic waves (correct)

Why is it important to remove processing-related artifacts from seismic data for AVO analysis?

To better understand rock and fluid properties Signup and view all the answers

In AVO analysis, what should seismic data processing aim to achieve with respect to energy losses?

Estimate and compensate for energy losses Signup and view all the answers

What is a critical impact that processing artefacts can have on AVO analysis?

Distorting the data and affecting AVO analysis results Signup and view all the answers

What is the main recommendation to address vertical anomalies in seismic data?

Apply additional amplitude correction Signup and view all the answers

In the context of seismic data analysis, what are footprints?

Regular patterns in amplitudes unrelated to geological events Signup and view all the answers

What is a common cause of migration artefacts seen on a seismic cross-section?

Problems with the velocity model used for migration Signup and view all the answers

How can acquisition footprints be effectively identified in seismic data analysis?

Calculating amplitudes across a wide time window Signup and view all the answers

What is the purpose of applying an amplitude correction map in seismic data analysis?

To enhance amplitude distribution realism Signup and view all the answers

How can different colorbars be beneficial in analyzing seismic data?

To reveal different artifacts based on color variations Signup and view all the answers

'Regular patterns in amplitudes that can hardly be related to geological events' best describes:

Migration artefacts Signup and view all the answers

What is the primary objective of the quality control stage mentioned in the text?

To ensure observed changes are related to target geology Signup and view all the answers

Which type of seismic data may require additional tools for quality control according to the text?

Land data affected by near-surface conditions Signup and view all the answers

Why is wavelet consistency important in the quality control process according to the text?

It ensures accurate estimation of reservoir properties Signup and view all the answers

Which logs are recommended for quality control to identify washouts and basic lithotypes?

Caliper, Gamma ray, and Sonic log Signup and view all the answers

In reservoir-oriented quality control, what is referred to as pre-conditioning according to the text?

An essential step to remove noise post-processing Signup and view all the answers

What is a key consideration in selecting tools for quality control according to the text?

The type of seismic data available Signup and view all the answers

Which type of well data is considered essential for some quality control tools mentioned in the text?

VP (Velocity of P-waves), VS (Velocity of S-waves), and Gamma ray logs Signup and view all the answers

What is the primary objective of the 'before-after-difference' control tool mentioned in the text?

To ensure that valuable signal is preserved during denoising procedures Signup and view all the answers

Why is it important to expand the frequency content to the higher end of the spectrum?

To minimize the sidelobes interference with primary reflections Signup and view all the answers

How does increasing low frequency bandwidth of the seismic signal affect its penetration depth into the subsurface?

It increases penetration depth Signup and view all the answers

What do intense sidelobes in a wavelet pose challenges to, as mentioned in the text?

Primary reflections resolution Signup and view all the answers

Why are amplitude and frequency maps calculated according to the text?

To analyse amplitude-frequency distribution Signup and view all the answers

What is the main purpose of calculating attribute maps based on the text?

To provide insights into subsurface properties and geological features Signup and view all the answers

Why is it crucial not only to preserve amplitude but also to maintain the widest possible seismic signal in quantitative interpretation?

To capture finer details within the subsurface geology Signup and view all the answers

What is an essential advantage of a broader seismic signal according to the text?

It enables capture of finer details within the subsurface geology Signup and view all the answers

How do column-like amplitude anomalies presented for the whole time interval differ according to the text?

They vary in different frequency ranges Signup and view all the answers

What do intensity and amplitude of sidelobes in a wavelet impact according to the text?

The sidelobes interference with primary reflections Signup and view all the answers

What is a common issue that can be addressed by applying trim-static corrections in seismic data processing?

Time shifts Signup and view all the answers

Why is pre-stack seismic data pre-conditioning considered essential?

To remove random noise from the seismic data Signup and view all the answers

What is the primary objective of the QC stage in seismic data processing?

Identifying and accounting for acquisition artifacts Signup and view all the answers

Why is control of the amplitude versus offset (AVO) response crucial in data preparation for AVO analysis?

To calibrate synthetic data with seismic data Signup and view all the answers

Which method involves calculating synthetic gathers after Rock Physics Modelling as part of AVO analysis?

Direct methods based on analysis of partial stacks Signup and view all the answers

What could a high time-shift detected during quality control of gather alignment indicate?

Inaccurate NMO correction Signup and view all the answers

In AVO analysis, what does the under-recovery of amplitudes with offsets suggest?

Anisotropy effects on NMO correction Signup and view all the answers

Why is it recommended to perform reservoir-oriented QC at all processing stages?

To ensure consistency between synthetic and real data responses Signup and view all the answers

How can the quality control stage prevent misinterpretation of seismic data?

By identifying and accounting for acquisition or processing artifacts Signup and view all the answers

What is one potential solution to address a slight under-recovery of amplitudes with offsets in AVO response optimization?

Utilizing angle-dependent wavelets Signup and view all the answers

What is the main objective of QC of pre-stack data and AVO effects?

To assess the accuracy of amplitude recovery with offsets Signup and view all the answers

What is a key criterion for a good well tie?

Consistency of wavelets across different wells Signup and view all the answers

What is the purpose of calculating AVO attributes like the Product (the Intercept * Gradient)?

To detect lateral and vertical variations in AVO Signup and view all the answers

What does lack of consistency among wavelets in different wells lead to?

Errors in impedance estimation Signup and view all the answers

What does the comparison of AVO effects in seismic and synthetic data help detect?

Acquisition and processing artifacts Signup and view all the answers

What is the significance of implementing amplitude correction version 2 in wavelet control?

Elimination of amplitude anomalies within the target interval Signup and view all the answers

Why may well-tie and wavelet estimation not yield conclusive results in the early stages?

Due to presence of noise during processing Signup and view all the answers

What should be done if AVO effects observed in seismic and synthetic data do not align?

Detect significant issues at any stage of processing Signup and view all the answers