| OpendTect User Documentation version 4.2 |
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A 2D horizon can be loaded in the scene by clicking on 'Load'. A new 2D horizon can also be created from 'New' or 'Create from 3D'.
The selected horizon(s) will be displayed in the scene. To start a new 2D horizon interpretation, read the Chapter- How to interpret Horizons.
The displayed 2D horizon contains the following pop-up menu items:
These options are described in the following sub-sections.
Create a 3D-horizon from a 2D horizon. As soon as a 2D horizon is tracked, a 3D horizon can be derived by right-clicking the 2D horizon in the tree and choose Derive 3D horizon. A window pops up in which you can select the algorithm (inverse distance interpolation or triangulation), shown in images below. The results can be displayed immediately by selecting the Display after generation option.
Generate 2D horizons from existing 3D horizons by right-clicking on 2D Horizon in the tree and selecting Create from 3D. A window pops up where you can designate the 3D horizon, the 2D Lineset and 2D line(s) where you want to create the new 2D horizon. This function allows for the 2D horizon to be created on one line, or on as many lines as a Lineset contains, all at once.
A 2D horizon displayed in the Scene can be re-interpreted by enabling the tracking option. Once it is enabled, it will launch the Tracking Setup window to start 2D horizon interpretation on 2D lines. It will also enable the tracking toolbar. Furthermore, the seed properties (e.g. color/size) can also be changed using this option.
Flatten the 2D line(s) with this option. A new flattened scene based on the selected 2D Horizon will be created.
Snap to event: Snap selected 2D horizon to the nearest event defined in the Event option (see below).
Horizon before snapping(red),after snapping (green)
This is a 2D gridding option for horizon interpolation by filling the gaps/holes in interpretation. If this option is selected for a horizon, a window with the following Horizon Gridding dialog box will pop up.
- Keep holes larger than: Define gridding interpolation area, i.e. by defining a threshold e.g. 2500m the gridding is restricted and gaps/holes up to a radius of 2500 meters will be filled.
- Algorithm: Interpolation algorithms for 2D horizon(s). Currently, OpendTect supports linear and polynomial interpolation types.
- Save gridded horizon: Overwrites or creates a new horizon from the selected horizon .
- Properties: Change the display settings for a horizon (color, reflectivity, line style).
- Display only at sections: Display the tracking horizon at section. Usefull for QC purposes to check if the tracked horizon lies on the expected reflector.
- Save/Save As: Save by selecting the "Save" option or save as new by selecting "Save As"[/listitem
- Lock: Lock horizon, disable updates/changes.
- Remove: Remove horizon from tree.