Description
Function for imaging of the results of 2D CO-MF search.
This procedure gives possibility to create stack section for the chosen offset class of common offset (CO) MultiFocusing and export CO-MF parameters.
Input data
Storage file 2D-CO
GMFPickingItem
Link to velocity constrain picking that can be taken from another procedure
Parameters
Calc Offset
Offset class for create stack
Create NMO corrected gathers
To the created stack section will be applied time correction to zero offset
Image creation parameters
Image creation is a stacking procedure of time-corrected events corresponds to the optimal MF parameters.The number of events to be preserved during the MF Search determined in Parametrization – MF engine → Wave values → Maximum number of directions. Each event stored in database has following properties:
•Semblance value
•Time
•And indexes corresponding to the MF parameter
During the stacking can be applied different criteria for selection: by angle range, by velocity range or by semblance distribution.
Directions
Maximum number of events to be stack.
•Default: 1
•Values: 1-Maximum Number of Directions preserved during the search
From angle
First value of angle range to stack.
•Default: -90
•Range: -90 - 0
To angle
Last value of angle range to stack.
•Default: 90
•Range: 0 - 90
SN Enhance
Turn ON/OFF normalization of data over semblance prior stacking.
Default: False
Correlation threshold
Threshold for event participation in the summation as a percentage ratio of the maximum value.
•Default: 10
•Range: 10 - 90
Min angle distance selection
Minimum distance in terms of semblance grid along angle axe, between events selected for summation. Parameter gives possibility to separate events with different correlation by angle (Figure 1).
•Default: 1
•Range: 1 - 100
Min radius distance selection
Minimum distance in terms of semblance grid along velocity axe, between events selected for summation. Parameter gives possibility to separate events with different correlation by velocity (Figure 1).
Default: 100
Range: 1 - 100
Testing
Max Distance To MF CMP
Max Distance To MF CO Trace
Interpolation Window Length
Stabilisation Window Length
Visualization
Apply following filters on sections and velocity semblance, for visualization only
Datum
Value of final (flat) datum
Default: 0;
ShiftToDatum
Turn ON/OFF shift to final (flat) datum
Default: false;
VelocityAGC
Types
Types of MF parameters to be created during imaging, created both vista item for visualization and gather
Stack
Create zero offset MultiFocusing stack section
Default:true;
Correlation
Create MF correlation section
Default: false;
Angle
Create MF emergency angle section
Default: false;
Gamma
CRE
Create MF CRE section
Default: false;
CRE2
CRE Azimuth
CEE
Create MF CEE section
Default: false;
CEE2
CEE Azimuth
V Slow
V Fast
Dip
Azimuth Dip
VSlow / cos(Dip)
VFast / cos(Dip)
Fold
Create MFfold section
Default: false;
Export Params
Write mode
Convert To Feet
Convert output measurement system to feet
No Zero Values For Velocity
Fill samples with zero velocities with V 0