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Description
The diffraction unmigrated stack approach presented it spoken paper was introduced and used a proof of concept for technology we are calling Multi-Focusing diffraction imaging. The difference is that in-place of producing diffraction unmigrated stack and than post-stack migrate it, we separate reflection and diffraction wavefield in prestack domain and than pre-stack migrate the diffraction component.
Input data
Storage file
SEG-Y data handle
Input sorted headers(of seismic data)
Vrms model
Output geometry
Dimension
Parameters
Storage type
FirstAzimuth
First azimuth for the Edge diffraction search
LastAzimuth
Last azimuth for the Edge diffraction search
HalfStepAzimuth
Half azimuth step for the Edge diffraction search
ZeroOffsetFactor
Output file name
Full path and filename of output SEGY file
Minimum offset CIG
Minimum offset for the common image gather
Maximum offset CIG
Maximum offset for the common image gather
Offset increment of CIG
Offset increment for the common image gather. Parameters Max offset and offset step can be used to limit the offset range of the input data. Cases where the Offset step of CIGis larger than the Max offset CIGwill produce only 1 offset class with the input data range equal to the Offset step of CIG. In cases where the Offset step of CIGis smaller than the Max offset CIG, the offset of the input data will be equalto the Max offset CIGplus the Offset step of CIG.
Aperture
Migration aperture
CrossAperture
Use full cmp aperture
Aperture side
Distance (meters) from the survey edge. Aperture value will be linearly increased (from 0 to maximum) in this offset range from the edge.Use this parameter to minimized migration operator artifacts along the survey edge
Use Stretching Factor
Stretch muting for migration operator
Stretching Factor
Factor for managing the mute zone
Replacement Velocity
Replacement velocity used to account for topography. Required parameter.
Anti-Alias Coefficient
Anti-aliasing filter coefficient. Increasing the coefficient produces a stronger filter (low frequency for far offsets)
Max freq for RHO
Maximum frequency of the output seismic data
Max Angle Aperture
Maximum angle aperture of the migration operator
Min Angle Aperture
Minimum angle aperture of the migration operator
Velocity factor
Velocity multiplier. By default 1 is used. (100% velocity field used)
Cmp Interval Along Inline
Bin size along the inline direction. Meters
Cmp Interval Along Xline
Bin size along the Xline direction. Meters
New Read data
Read bulk size
Decimation Factor
Migration Mode
Phase rotation
Additional
Input data BinGrid
Velocity data BinGrid
Fold Limitation
Use Fold Limitation
Max Fold
Min Fold
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