Pick Multiple Horizons

Description Automatically pick multiple horizons from seismic volumes.
Module(s) Explorationist
Requirements Seismic Volume
Related Body Detection
Works with Stacks, Gathers

This process picks multiple horizons simultaneously using the waveform propagator. Parameters provide additional control over horizon spacing and minimum size.

Tip: In cases where many horizons are displayed, the 3D view can get cluttered and difficult to interpret. Switch horizons between showing intersections and surfaces in the 3D view by opening the Horizon tab and clicking Show whole or intersecting horizon in 3D in the panel header.

Create pick multiple horizons process

Create pick multiple horizons process
  1. In the Control Panel, open the Process tab.
  2. At the tab header, click the Add icon and select New Process.
  3. Double-click Pick Multiple Horizons.
  4. Type a name for the process and click OK.

Pick multiple horizons

Pick multiple horizons
  1. In the Details Panel at Volume, select the volume on which the multiple horizons will be picked.
  2. Select the common offset value where you want to pick your horizons at Offset. This field will only be enabled if you have selected a gather volume at Volume.
  3. At Top horizon and Base horizon, you can select a top and bottom horizon that you have created to constrain the multiple horizons picking between the upper and lower horizons.
  4. At Constrain to area, select a polygon/probe to constrain the picking within the area covered by the polygon/probe. To do this, you should first create a polygon in the Map View or a probe (see Creating a Polygon in Map View and Creating a Probe).
  5. Select the event type snapping option at Event type. Available options include Positive Event, Negative Event and Positive and Negative Events. The third option allows the propagator to pick on both the positive and negative events in one pass.
  6. Other parameters have been set by default. Adjust accordingly based on your needs. The following describe other parameters for multiple horizons picking:
    • Half-window size — The amount of time/depth searched along each trace by the waveform propagator to determine correlation.
    • Probability threshold Value (%) is a goodness of fit measure that determines whether a point should be considered to fall on the horizon being defined.
    • Maximum shift The maximum vertical distance that the horizon propagator can "jump" from one point to the next.
    • Minimum horizon patch size The minimum number of points in any horizon patch to be included in the results.
    • Vertical spacing Vertical spacing between the horizons.
  7. Click Start to begin picking. Once the process completes, you will see multiple horizons created in the Horizon tab in the Control Panel.