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<< Click to Display Table of Contents >> Navigation: Migration > Kirchhoff PreSTM - gather in/out - migration |
The module computes 2D/3D time migration of seismic traces after stacking. Algorithm is Kirchhoff’s integral trace migration where each sample considered as top of coherent events of diffraction wave followed by stacking samples. In another words Kirchhoff migration estimates diffracting amplitudes by correlating the input seismic data with an calculated model of the diffraction that would appear if the image point consist of diffraction event. All dip and diffraction events migrated into their real location. Diffraction waves described by RMS velocities. This module reads input seismic data from RAM.
Input seismic data are stack, CMP gathers.
Output data is stack.
Execution options - only standalone (1 computer execution).
Link to input seismic traces.
Link to input velocity traces.
Link to virtual trace headers which has geometry information for output seismic traces migrated.
By default the module defines output geometry from “Sorted headers of input data”.
Choose the dimension from available options i.e. 2D/3D
Migration aperture.
Choose the aperture type from the drop down menu.
Constant & Time variant
Distance (meters) from survey edge.
Aperture value will be linear increased (from 0 to maximum) in this distance range from edge.
Use this parameter for minimized migration operator artefacts on survey edge.
Stretching muting for migration operator.
Factor for managing of mute zone.
Replacement velocity used for take into account topography.
Necessary parameter.
Velocity multiplier.
Antialiasing filter’s coefficient.
Coefficient increasing produce stronger filter (low frequency for far offsets).
Maximum frequency of output seismic data.
Maximum angle aperture of migration operator.
Bin size along inline. Meters.
Bin size along xline. Meters.
Define the value to increase the performance run time so that it will take less time to finish the migration without compromising the quality of the final output stack.
Choose the available options to execute the module from either CPU or GPU