Synthetic Generation Modes
GeoSyn offers two different modes when generating a synthetic:
- Modelling mode — Time objects are placed by referencing velocity fields from a sonic log. The active sonic is edited by the user, however imported check shot surveys or time depth charts are only referenced (once) to correct the sonic and are then discarded.
- Correlation mode — Time objects are placed by referencing velocity fields from a saved time depth chart.Objects are moved in time by altering the saved time/depth chart, not the sonic.
Refer to the chart below for the advantages and disadvantages of each mode.
|
Mode |
Advantages |
Disadvantages |
|
Modeling mode |
Allows accurate “What if “log models to be to generated because log editing will change reflection coefficients as well as time spacing (tuning effect). |
Tightly spaced, mis-picked check shots, or badly designed time depth charts can generate dramatic excursions during the correction operation. Generally, time /depth correction data should be coarsely spaced and quality controlled for valid velocities. |
|
Correlation mode |
Correlating seismic is simplified. Reflection coefficients are readily moved by manipulating the time/depth chart. |
With unlimited flexibility, it is easy to introduce unreasonable or impossible velocity regimes. GeoSyn provides tools to monitor for this. |