3.4. Wheeler Transform / Wheeler Scene
3.4.1. Wheeler Scene
Add Wheeler scene: Simply click 'Add Wheeler scene' in the SSIS menu (see figure below). When 'Add Wheeler scene' is insensitive (greyed out), select a Chrono Stratigraphy (SSIS > Chrono Stratigraphy > Select).
Note: only one Wheeler scene can be added since the display is linked to the 'active' Chrono Stratigraphy. When a different Chrono Stratigraphy is selected, the Wheeler Scene will be adjusted automatically.
In the Wheeler scene, flattened seismic data can be displayed by adding elements (inline, crossline, and timeslice) in the tree. By displaying flattened seismic data one can assess the quality of the selected Chrono Stratigraphy. Making a good Chrono Stratigraphy is an iterative process. It will probably take several runs before the result is satisfactory. In order to improve Chrono Stratigraphy the user can try to;
map additional horizons (sequence boundary)
fill holes in mapped horizons
make horizons continuous and watertight
filter the steering cube (data-driven approach)
Note: In the Wheeler scene, stored data is transformed on-the-fly to the chronostratigraphic domain. All attributes and neural network outputs are calculated in the normal domain first and then transformed to the Wheeler domain. Because of this transformation, quickly scanning through your Wheeler is only possible after creating a Wheeler cube. On-the-fly calculations are not supported for the volume viewer, which only accepts input from pre-calculated Wheeler cubes.
3.4.2. Create Wheeler Cube
A WheelerCube is a seismic volume in the Wheeler domain. When a WheelerCube is displayed on an element in the Wheeler scene, no transformation is needed (saves time). Any stored volume, attribute or neural network output can be converted to the Wheeler domain. Select the stored volume you want to transform and specify a name for the WheelerCube. The Wheeler Cube is created in batch-mode (see section 8.2 in the OpendTect User Documentation). A stored WheelerCube can be displayed by right-clicking an element in the tree, then click select attribute > Wheeler Cubes.