Use Insight's interpolation/extrapolation operation to fill gaps and holes in horizons.
Regular X/Y, 3D and 2D horizons can be interpolated. To interpolate or extrapolate sparse X/Y horizons, use the regrid operation to convert them to a regular grid.
- Where is the Interpolate/Extrapolate operation?
- Configuring Interpolate/Extrapolate
- Completing the operation
Note: The Interpolate/Extrapolate button is disabled if the input horizon is waiting for another operation (such as propagation). Insight notifies you to complete the previous operation before continuing.
Where is the Interpolate/Extrapolate operation?
Interpolate/extrapolate is found in the Map View, under the Operations tab (along with other horizon operations).
- Open the Map View.
- Expand the left panel and open the Operations tab.
- At Operation, select Interpolate/Extrapolate.
Tip: Click the Help icon to read more information about this operation.
The default mode (interpolation) fills enclosed regions according to the settings.
- In the navigation bar, select the horizon to interpolate.
- At Maximum search (m), define the maximum distance.
- When finding a result at a location, points beyond this distance have no effect.
Interpolation Settings: (see How Interpolation Settings Work)
- Spreading: natural neighbour weighting
- Smoothing: inverse-distance weighting
- Strike/dip: define the influence in the strike direction.
- Direction (degrees): The azimuth of the strike axis, in degrees (clockwise from North).
- At Limit area, select a polygon/probe to constrain the operation.
- Enable Faults to prevent the interpolation from crossing fault planes.
- Insight honours any enabled faults in the Control Panel. Unassigned fault sticks are not used.
- Fault Polygon: Fault polygons are excluded from interpolation / extrapolation (if selected)
- Click Interpolate to start the operation.
Enable extrapolate to completely fill a specified region according to the settings.
- Enable the Extrapolate check box.
- The maximum search distance has no effect when extrapolating.
Constrain to area field changes to Fill area.
- (required) Select a polygon/probe to fill
- Click Extrapolate to start the operation.
Completing the operation
After running the operation:
- Click Discard to cancel this calculation and delete the results.
- Click Replace this horizon to save this horizon containing the extracted values and replace the previous one.
- Click Save as New Horizon to create a new horizon.
To assist reviewing the results in the 3D and Map Views, interpolated / extrapolated points are displayed in a solid colour. The original values appear semi-transparent. This lasts until the operation is completed.
The following examples show a horizon in the Map View before and after interpolation:
Note: By default, the new horizon will be named: “horizon_name (interp/extrap)”. For example, the operation above will yield a new horizon called "Sample (interp)". To rename the horizon, see Horizon Details and Configuration.