Diffraction > Engine-Diffraction imaging 2D/3D

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

Engine - Diffraction imaging 2D/3D