2D Global Interpretation
To adapt the Relative Geological Time (RGT) method in two dimensions, a 2D horizon patch grid is created and the links between the patches are automatically established by using the same method as in 3D. Although the workflows are similar until that stage between 2D and 3D, the quality of the resulting 2D RGT model is not as accurate as in 3D. As there are less connections between the patches in 2D seismic, the RGT model is more sensitive to the noise effects and seismic artefacts, generally more important in 2D acquisitions.
To overcome this issue, the 2D RGT model is built according to a certain number of events defined or “marked” by the interpreter. RGT values are first computed only on the “marked” horizons, using the same chronostratigraphic algorithm. This way, the RGT values strictly honour the marked horizons, which is essential to be conformable with stratigraphic discontinuities. Then, intermediate RGT values are calculated on the remaining patches of the grid by using a thickness optimisation method.
To overcome the mis-tie effects between lines, the grid is calculated on the entire line set. 2D RGT models obtained on single lines are synchronized by connecting the marked horizons at their intersection. The mis-ties are then minimized by correcting the vertical differences of the RGT values for each marked horizon at their intersection. This way, variable trace shifts are obtained for each intersection between the lines.
- Single and multiple 2D interpretation
- Mis-tie correction with dynamic shift
- 2D Model-Grid, 2D Geomodel, 2D Horizon Stack
- Horizon picking and 2D tracking
- Pseudo 3D Geomodel creation