Virtual 2D geometry by common offsets
Midpoint Consistent Regularization is a seismic pre-processing step that ensures the input data are uniformly sampled in the midpoint domain—i.e. every Common Midpoint (CMP) bin has the same, regularly spaced set of offsets (or traces). By enforcing consistency in midpoint and offset sampling, we eliminate irregular fold and offset coverage, which greatly improves the quality of velocity analysis, stacking, and migration.
Real-world surveys often have uneven source/receiver spacing due to obstacles, equipment limits, or terrain. Stacking assumes uniform midpoint sampling. Irregular data reduces stacking efficacy and introduces noise. Wave-equation migration algorithms require regular input grids to avoid numerical errors. Regularization ensures amplitude-vs-offset (AVO) and amplitude-vs-azimuth (AVAz) signals remain undistorted.
This procedure creates regularized geometry based on midpoint. For each given midpoint, it creates virtual geometry with regularized offsets with user defined offset step size.
Crooked line - connect/reference to Output trace headers/Output stack line of Binning 2D.
Offset first - provide the starting or minimum offset (absolute value) to regularize
Offset last - provide the maximum or last offset (absolute value) to regularize
Offset increment - specify the offset step size or increment.
Skip - By default, FALSE(Unchecked). This option helps to bypass the module from the workflow.
Trace headers - generates offset regularized trace headers
Traces count - displays the total number of traces
Bins count - displays total number of CMP/CDP.
In this example workflow, we are regularizing an onshore crooked line (2D). Make the connection/reference to Output stack line of Binning 2D to Crooked line.
Specify the appropriate parameters as per the input data and execute the module. It generates location map as a vista item besides Output trace headers as a output item.
There are no action items available for this module so the user can ignore it.
YouTube video lesson, click here to open [VIDEO IN PROCESS...]
Yilmaz. O., 1987, Seismic data processing: Society of Exploration Geophysicist
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