| OpendTect Workflows Documentation version 4.2 |
|---|
| Prev |
|
Next
|
Purpose: To interpret genetically associated stratigraphic units that were deposited during specific phases of relative sea-level cycles.
Theory: In systems tract interpretation, you look at stacking patterns and lapout patterns (onlap, toplap, offlap) in both the Structural domain and the Wheeler transformed domain. Based on these observations you decide whether you are dealing with a transgression (Transgressive Systems Tract), a Normal Regression (either a High Stand Systems Tract or a Low Stand Systems Tract) or falling stage (Falling Stage Systems Tract). Nomenclature according to Hunt and Tucker. (In SSIS you can choose which model (nomenclature) to use.)
Software: OpendTect + Dip-Steering + SSIS
Workflow:
- Select a pre-calculated chrono-stratigraphy.
- Add a Wheeler scene and use the selected chrono-stratigraphy to flatten the seismic data (or attribute).
- Open the Interpretation window, choose a model and use the chrono-strat sliders to set the systems tract boundaries. Assign the systems tract by right-clicking in the interpretation column. Note the automatic reconstruction of the relative sea level curve.
Tips:
- Use arrows to indicate lapout patterns to help you decide where to set systems tract boundaries.
For more info, see this Tutorial video:
SSIS interpretation (flash video)