Module performs smoothing of 3D velocity field.
Input DataItem
Use slope gathers
Use slope gathers - true
Input gather slope inline
Input gather slope crossline
Use gathers or seismic file { Gather in - gather out, File in - file out }
Use gathers or seismic file - Gather in - gather out
Use gathers or seismic file - File in - file out
Gather domain { TIME, DEPTH, FREQUENCY } - it automatically detects the input gather domain. By default, TIME. In case the user wants to select the appropriate domain, choose the gather domain from the drop down menu.
Type of smooth { Fast, Gaussian } - there are two types of smoothing options are available. Depending on the requirements of the operation, the user can choose the smoothing type.
Type of smooth - Fast - this is a simple averaging of velocities in a fixed window. Each velocity value is replaced by the mean of nearby samples.
Work mode { Constant, Variant } - select the work mode from the drop down menu.
Work mode - Constant - in this mode, it will be constant values of the horizontal and vertical windows.
Smooth grid x direction(radius) - number of inlines to be considered in the X direction for smoothing
Smooth grid y direction(radius) - number of crosslines to be considered in the Y direction for smoothing
Smooth grid z direction(radius) - number of time/depth samples to be considered for smoothing in the Z direction
Work mode - Variant - this mode works with variable values of both horizontal and vertical windows.
Variant values table - click on the 
icon and it will pop-up a new window. Define the respective parameter values in the table.
Use fractional window - by default, FALSE (Unchecked). If checked, it will use
Use dynamic window - by default, FALSE (Unchecked). This option is available when the Type of smoothing is "Fast"
Use dynamic window - true
Max aperture - by default, 5. Maximal number of iterations to find a value that differs from the ignored value.
Apply horizons constrain - by default, FALSE (Unchecked). This will give more control to the user to smooth the velocity model based on the horizon.
Apply horizons constrain - true - If the horizon constraint is TRUE, the user should provide the horizon.
Horizons - connect/reference to the input horizon to control the velocity smoothing.
Horizon taper size - this controls the velocity smoothing. Based on the user specified taper value, it will apply the velocity smoothing below or above the horizon.
Type of smooth - Gaussian - this is a weighted smoothed method by using Gaussian bell shaped function. In this method, nearby samples contribute more than the far samples.
UNSAFE -
Ignore value mode - in this section, the user has the option to ignore some of the velocity values.
Fill ignore value places - by default, FALSE (Unchecked). If TRUE (Checked), replace the sample with smoothed value.
Ignore value - specify the value that should be ignored. Value that will not participate in smoothing algorithm, this value remains as is without changes.
Auto-connection - By default, TRUE(Checked).It will automatically connects to the next module. To avoid auto-connect, the user should uncheck this option.
Number of threads - One less than total no of nodes/threads to execute a job in multi-thread mode. Limit number of threads on main machine.
Skip - By default, FALSE(Unchecked). This option helps to bypass the module from the workflow.
Output DataItem
Output SEG-Y data handle
Output trace headers
Output gather - outputs the smoothed velocity gather as an output gather.
Calculated inlines count - displays the total number of calculated inlines
Calculated crosslines count - displays the total number of calculated crosslines
In this example, we've connected/referenced a single inline Vrms velocity as an input to Smooth 3D module. This input is taken from Stack Imaging module.
There are no action items available for this module.
YouTube video lesson, click here to open [VIDEO IN PROCESS...]
Yilmaz. O., 1987, Seismic data processing: Society of Exploration Geophysicist
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