Create deblending operator for Vibroseis data
A vibroseis plate sweep is the actual sweep generated by the vibrator plate and measured through sensors on the truck (ground force, reaction mass, or reference). It represents what the vibrator really produced, not just the programmed pilot sweep.
A Filtered Vibroseis Plate Sweep is the cleaned, bandwidth-limited, and harmonic-controlled version of this real sweep. It is used in:
•Deblending of simultaneous-source data
•Correlation and deconvolution
•QC of vibrator performance
•Sweep extraction from field records
Filtering ensures the sweep is:
•Smooth
•Free of unusable frequencies
•Free of most harmonic contamination
•Suitable as a reference in processing
Why Do We Filter It?
Real vibrator plates introduce:
•harmonic distortion
•mechanical noise
•limited low- and high-frequency performance
•nonlinearities
•vibrator–ground coupling variations
Filtering removes these issues so that the sweep can be accurately used for deblending and correlation.
Input file should be provided in the Parameters tab.
Seismic filename - provide the input seismic file with sweep
Number of Harmonic for de - blending - specify the total number of harmonics (additional sinusoid) for deblending. It controls how many harmonic distortion components are identified or removed. Essential for accurate deblending and characterizing Vibrator non-linearity.
Time window for spectrogram - spectrogram shows how frequency evolves over time. Specify the time window for spectrogram analysis. Larger windows helpful in better frequency resolution and smaller windows will helpful in time resolution.
Sweep extraction - this section deals with the sweep extraction. Based on the user defined parameters, it will extra the sweep from the input seismic file and used it as a model sweep.
Start Frequency Fr1 - specify the start sweep frequency
End Frequency Fr2 - specify the end sweep frequency
Skip - By default, FALSE(Unchecked). This option helps to bypass the module from the workflow.
Modeled sweep signal - generates modeled sweep signal as an output.
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YouTube video lesson, click here to open [VIDEO IN PROCESS...]
Yilmaz. O., 1987, Seismic data processing: Society of Exploration Geophysicist
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