1. Visualizing Prestack and Multi-Component Data in OpendTect
OpendTect Master Class
June 15, 2014

2. Outline Introduction Prestack Visualization
In 3D scene
In 2D Panel
Display Gathers
Display Mute, Display Angle Gathers
Multi-Component Visualization
Evaluation of Multi-Component Data
Example: Spectral Decomposition Cube

3. Introduction
This presentation will first cover the visualization of prestack data in OpendTect and continue with a method for viewing (and evaluating) multi-component data.
The steps for each method will be covered.
Requirements:
Sufficient RAM (8+GB) and a good graphics card (1+GB)

4. Introduction License Requirements
Prestack Visualization No additional license required
In 3D scene
In 2D Panel
Display Gathers
Display Mute, Display Angle Gathers
Multi-Component Visualization No additional license required
Evaluation of Multi-Component Data
Example: Spectral Decomposition Cube

5. Outline Introduction Prestack Visualization
In 3D scene
In 2D Panel
Display Gathers
Display Mute, Display Angle Gathers
Multi-Component Visualization
Evaluation of Multi-Component Data
Example: Spectral Decomposition Cube

6. Prestack Visualization (3D Scene)
Using the Penobscot dataset (available on the OSR)
Load an inline (or crossline) and right-click on the data displayed in the scene in order to load the prestack which is displayed in the crossline direction

7. Prestack Visualization (3D Scene)
The positions pop-up allows you to step along the inline in user-defined steps or enter the crossline number directly.
Alternatively, you can drag the prestack directly to reposition and the data is displayed on release:

8. Outline Introduction Prestack Visualization
In 3D scene
In 2D Panel
Display Gathers
Display Mute, Display Angle Gathers
Multi-Component Visualization
Evaluation of Multi-Component Data
Example: Spectral Decomposition Cube

9. Prestack Visualization (2D Panel)
The prestack data may also be displayed in the 2D Viewer (right-click on the prestack in the scene):

10. Prestack Visualization (2D Panel)
The ‘Set Positions’ icon allows you to change the ranges and step (therefore the number of gathers displayed):

11. Prestack Visualization (2D Panel)
The ‘Set Gather Data’ icon allows for selection of multiple gathers:

12. Prestack Visualization (2D Panel)
The ‘Set seismic display properties’ icon gives display options for individual gathers:

13. Outline Introduction Prestack Visualization
In 3D scene
In 2D Panel
Display Gathers
Display Mute, Display Angle Gathers
Multi-Component Visualization
Evaluation of Multi-Component Data
Example: Spectral Decomposition Cube

14. Prestack Visualization (2D Panel)
Clicking on the ‘Pre-processing’ icon allows the following options:

15. Prestack Visualization (2D Panel)
You may load and display mute functions:

16. Prestack Visualization (2D Panel)
Angle data may be displayed:

17. Outline Introduction Prestack Visualization
In 3D scene
In 2D Panel
Display Gathers
Display Mute, Display Angle Gathers
Multi-Component Visualization
Evaluation of Multi-Component Data
Example: Spectral Decomposition Cube

18. Multi-Component Visualization
Using the Spectral Decomposition attribute as an example, we will demonstrate how it’s possible to create a multi-component cube.
It is still quite cumbersome in v4.6, but in v5.0 this process will be enhanced and made more user-friendly.
The general idea (v4.6) is that one creates a ‘pseudo-prestack’ cube using the ‘Create multi-cube pre-stack data store’ feature (located via the ‘Manage 3D Prestack Seismics’ window).

19. Multi-Component Visualization
The frequency components of Spectral Decomposition are each assigned a ‘pseudo-offset’ value as the cube is constructed

20. Multi-Component Visualization
It may be useful to label your frequencies with ‘appropriate pseudo-offsets’ (ie: 4Hz-400m, 8Hz-800m, etc.)