Non-Parabolic RMO Picking
Non Parabolic RMO picking will automatically pick peak or trough events of the gather using user defined intervals and horizon tracking parameters.
This can be done on a full volume or volume between two horizons, and/or constrained within a probe or a polygon area.
Settings for Non Parabolic RMO picking
- In the Control Panel, open the Imaging tab.
- Click the Episode (see Create Episode for RMO picking).
- Select the RMO to open the Details Panel.
- Azimuth (degrees): Type the azimuth degree to be used in the RMO picking on the 3D parabolic volume. This is mandatory.
- Inner Mute / Outer Mute: If you have picked the inner and/or outer mutes (see Manually Picking a Mute and Creating an Angle Mute), select to include muting in the RMO picking.
- Use Vertical Ramp: Click to enable vertical ramp.
- Ramp Distance: Mute ramp distance.
- Constrain to area: Select a polygon/probe to constrain the picking within the polygon/probe area.
You must define at least one layer by specifying a horizon or constant value for top and base. Additional layers may be inserted using the blue “+” button, or removed using the red “x” button.
The layer parameters apply at the layer boundary and are linearly interpolated across the interval between them.
- Pick on this horizon: Place a pick on this horizon (subject to the minimum semblance setting).
- Skip location if horizon missing: If unchecked and the horizon is missing at any gather the picker may still attempt to pick other layers if there is at least one. An out-of order horizon (such as being above the previous layer horizon) will also be treated as missing. The gather may still be skipped if the intervals above and below the missing horizon cannot be combined because they have conflicting settings (such a different event type).
- Window Length (ms): The size of the vertical window used for picking
- Range of gamma: Limits the events that may be picked to those having gamma within this range. Gamma is calculated by finding the best-fit parabola along the picked event.
- Minimum pick spacing (ms): Prevents events being picked that are closer that this vertical distance
- Minimum semblance: Events with a computed semblance below this value will not be picked
- Stop threshold (%): A goodness of fit measure that determines whether a point should be included in an event being picked.
- Maximum shift (ms): Maximum vertical shift allowed between neighbouring traces in the gather.
- Minimum event length (%): Controls how many traces in the gather an event must be found in order to be picked, as a percentage of the unmuted traces at that depth.
- Offset smoothing radius (m): Leave at zero to perform no smoothing. Otherwise a picked event will be smoothed across the gather using a window of this size.
Pick this interval: If checked the picker will attempt to pick events in the interval between the horizons above and below, with the other settings linearly interpolated across the interval.
- Positive Event: Pick only events that follow a peak
- Negative Event: Pick only events that follow a trough
- Positive and Negative Events: Pick both types of events
Note: When doing a volume-based non parabolic RMO picking, an "RMO Gamma" volume will be available in the Volume tab. By default, this volume will take the name of the RMO item.
See Configure Display Settings (RMO) to set the display settings.