Grid To Horizon
The Grid to Horizon application allows you to create horizons from grids. Because grids can exist where there is no seismic data, the values of the grid at each trace on the seismic is used. The grid can be used to fill spaces, limited by trace and line increments, or limited using polygons.
How do I convert a grid to a horizon?
-
Select the Input Grid.
-
Enter the name of the Output Horizon. Note: You can type a new output horizon or select one that already exists.
-
Specify the Horizon Type. Standard horizons are visible on the seismic and can have associated amplitude horizons.
-
Specify the Vertical Units. When transferring to time seismic, use Milliseconds. For depth seismic, specify the units the volume is in.
-
Set the Transfer To options.
-
Select the Destination Seismic Lines that the horizon should be transferred to.
-
Click
to create the horizon.
General Information
Transfer Parameters
Input Grid: Select an existing grid to transfer to a horizon.
Output Horizon: Select the horizon to transfer the grid to. You can select an existing horizon, or type in the name of a new horizon.
Horizon
Type: Select the type
of horizon to output. This parameter has no effect when
transferring to an existing horizon.
- Standard: This is a normal horizon that can be displayed in the Seismic Viewer. The horizon contains both a structure and amplitude component. Initially the amplitudes will not be valid, but these can be calculated using the Snap/Extract Amplitudes dialog.
- Computed Structure: The output horizon will contain a structure but no amplitude component.
- Computed Amplitude: The output horizon will contain an amplitude but no structure component.
Vertical Units: Select the vertical units for the output horizon. Options are Milliseconds, Meters or Feet. This parameter has no effect when the Horizon Type is Computed Amplitude.
Depths are Subsea: Turn this on when the original grid z units are subsea depth. This parameter is only available when Vertical Units are set to Meters or Feet.
Transfer
To: Specify how to
transfer the grid to the horizon. The parameter is only
meaningful when transferring the grid to an existing horizon.
Gaps only:
Only
transfer
the grid to locations that do not already have a horizon
pick. Use this to fill in holes in a horizon.
Gaps and
existing picks: Transfer the grid to
the horizon and overwrite
any existing horizon
picks that overlap the grid. Horizon picks outside of the
grid
bounds are not affected.
Horizon Destination Options: Specify the line and trace increment to use. This is useful when you are using an existing grid to help pick a horizon. By transferring only some picks you can then use these as seed pick for 3D Auto Picking, or for manually picking horizons.
Polygons:
Open the Select Polygons dialog
and select inclusion or exclusion
polygons to restrict the geographical extents of the grid to horizon
transfer.
Destination Seismic Lines
Select the destination seismic lines. Left click to select the seismic
line, use the Ctrl key
on your
keyboard to select multiple lines, or select groups of lines from the
Basemap. To help you make your seismic line selections, you can sort
any column by left clicking on
the column header, you can apply a filter
(
),
or you can type a search string into the search
bar to limit the list based on Name, or Owner information.
For additional selection and navigation options right click on the Destination Seismic Lines list to
access
the shortcut
menu.
Include SEG-P: Turn this on to include SEG-P lines in the Available list. Horizons can be associated with SEG-P files.
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