42 Questions
What are the three main stages of an inversion project?
Data Preparation, Inversion Preparation, Interpretation Results
What is the primary focus of Data Preparation in the inversion workflow?
Gathering and pre-processing required data
What is a key aspect of Inversion Preparation in the inversion workflow?
Wavelet estimation
Why is the phase of testing inversion parameters essential in the inversion project?
To ensure reliability and validity of inversion results
What is one of the main goals of the Quality Control process in the final Inversion phase?
Assessing the reliability of inversion results
Why is the inversion workflow sometimes described as iterative in nature despite its linear illustration?
As a result of frequent adjustments and refinements in the process
What is the tuning effect related to?
Constructive or destructive interference of waves
What spacing leads to reflections undergoing constructive interference?
Spacing less than one-quarter of the wavelength
What is the primary focus during the data preparation stage of an inversion project?
Quality of data and uploading all data correctly
Why is it important to be aware of different wavelet conventions?
To check polarity in new datasets
When do two events become indistinguishable in time?
At spacing greater than one-quarter of the wavelength
What is crucial to check before running an inversion to achieve project objectives?
If the inversion will meet project objectives
What is the first step in the data preparation stage of the Seismic Inversion workflow?
Load wells
Why is checking well logs essential before starting the Seismic Inversion process?
To ensure proper calibration and quality control
What is a key requirement for well-to-seismic tying, wavelet estimation, and building the low-frequency model in Seismic Inversion?
Elastic logs
What type of data is highly recommended to build the initial model in Seismic Inversion?
Seismic velocities
Why should horizons be smoothed and extend throughout the area of the seismic data?
For quality control of seismic data
What is a typical quality control check recommended for well logs at the start of a project?
Display spatial maps of well locations
Why are well logs crucial for lithology classification in Seismic Inversion?
To create the training set for classification
What is the key role of elastic logs in Seismic Inversion?
For well-to-seismic tying
Why is a robust quality control process necessary for Seismic Inversion?
To ensure accurate and reliable results
What should be done if well logs contain spurious data before starting the Seismic Inversion process?
Edit and condition them to remove spurious data points
What is the purpose of denoising in seismic data processing?
To attenuate random noise for clearer interpretation
What is the main objective of analyzing available data before the inversion process?
To verify if desired inversion is feasible based on data quality
Why is the Vp/Vs property crucial in differentiating between Shaly carbonate and clean carbonate?
Due to their similar P-impedance values
What can be cross-plotted with P-impedance to translate it into reservoir properties like porosity?
Vp/Vs
What does forward modeling from well data help to check in AVO understanding?
AVO effects for different fluid content
Which convention for zero-phase wavelet is generally used in North America?
Normal polarity
Why is random noise attenuation important in seismic interpretation?
To remove noise that hinders interpretation
What information does cross-plotting elastic properties from well logs provide?
It helps separate different fluids and lithologies
What is the main purpose of synthetic gathers in AVO understanding?
To check if AVO behavior is preserved across scenarios
Why is seismic polarity important to understand before working with seismic data?
To interpret reflection coefficients correctly
What is one common issue with well conditioning that may lead to depth shifts between logs?
Different logging runs covering different depths
Why is horizon preconditioning necessary prior to the model building step?
To define horizons within the inversion grid
What is a challenge in horizon conditioning related to noisy picks and cycle skipping?
Smoothing noisy picks
Why is it crucial to conduct a thorough evaluation of observed variations in horizon data?
To understand their geological origin
What is a primary objective of reservoir-oriented seismic conditioning?
To optimize AVO response in gathers
How can crossing horizons and noisy picks in horizon data be addressed?
By applying trim statics correction
What impact can residual moveout have on the estimation of reservoir properties?
Lead to inaccurate Vp/Vs ratio estimation
Why should processing sequences be checked for AVO friendliness during seismic data QC?
To ensure they do not include AGC
"Residual NMO" primarily impacts the AVO behavior and properties estimation of which of the following?
$V_p / V_s$ ratio
"Missing log coverage" in well conditioning can be addressed by:
All of the above
Test your knowledge on issues related to well log conditioning, such as missing log coverage and bad borehole conditions. Understand methods to estimate missing elastic logs and improve data quality.
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