Full Volume Parabolic RMO Picking
Parabolic RMO picking can be done on a full volume or volume between two horizons, and/or constrained within a probe or a polygon area.
Available in: Image Gather Processing module
Configure full volume parabolic RMO Picking
- In the Control Panel, open the Imaging tab.
- At the tab header, click the Add icon and select New Episode to configure a new episode of RMO picking if you have yet to create a new episode to store your RMO Picks. Follow the steps in "Create episode" in Horizon-based RMO Picking.
- In the Imaging tab, select the episode which you want to create new RMO picks.
- Go to the Details Panel, click New RMO Picks. The Configure RMO Picking window will be displayed.
- Alternatively, click the Add icon in the Imaging tab, and select New RMO. Select the episode in which you want to pick the RMO and click Select. The Configure RMO Picking window will be displayed.
- At RMO Name, type a name for the RMO picks.
- Select the Shared check box if you want to make the RMO picks visible to other users.
- Select the Gather type and gather volume to be used for the RMO picking at Offset Gathers. Both 2D and 3D gathers are supported in RMO picking. For 2D gather, only CMP gather can be selected for RMO picking.
- At Type, select Full volume parabolic RMO picking. This is to allow volume-based parabolic RMO picking where you can pick on a full volume, or the volume between a top and bottom horizons and/or inside a polygon/probe area.
- Click OK to confirm the RMO picking configurations. A new RMO item will be available as part of the episode in the Imaging tree.
Define settings for volume-based parabolic RMO picking
- In the Control Panel, open the Imaging tab.
- Click to select the episode in the tree to open the Details Panel.
- In the Picking section, you can define the processing parameters.
- At Azimuth (degrees), type the azimuth degree to be used in the RMO picking on the 3D parabolic volume. This is mandatory.
- If you have picked the inner and/or outer mutes (see Manually Picking a Mute and Creating an Angle Mute), select this at Inner Mute and Outer Mute to include muting in the RMO picking.
- At Top Horizon and Base Horizon, select to use a Constant or Horizon, or both, to constrain the RMO picking. Leave these blank if you want to pick on the full volume.
- At Constrain to area, select a polygon/probe to constrain the picking within the polygon/probe area.
- 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.
- Define the Spacing at surface value. This is the minimum pick spacing on the surface.
- The Spreading with depth value controls how much the minimum vertical spacing between the picks increases as depth increases. A value of 1.0 means the spacing will be the same as the value set at Spacing at surface. Meanwhile, a value of 1.1 means that the spacing will increase by a factor of 1.1 every km below the surface. For example, if you set Spacing at surface at 500 m and Spreading with depth at 1.1, the spacing at 1000 m deep will be at least 550 m. In general, the formula is: Spacing at z = Spacing at surface * [1 + (Spreading with depth - 1) * z/1000].
- At Avoid horizon picks (ms), type the distance above (left box) and distance below (right box) for the picker to look for other horizon-based picks that had already been made in the episode and avoids picking in the vicinity of those horizons. By default, this is set at 50 ms (or 50 m) above and 150 ms (or 150 m) below.
- You can change other picking parameters including the Window Length (ms) and Maximum parabolic shift if necessary. A window length of 100 ms will pick RMO in every 100 ms window. The maximum parabolic shift is calculated at the specified outer mute.
- The Hand-pick radius of influence (m) defines the radius the system will cover when hand-picking.
- You can define the maximum allowed upward and downward shift when re-picking at Re-pick shift limit.
- Select the Apply smoothing check box to smooth the RMO picks and then define the smoothing radius to be applied specifically to the inline and crossline directions. This feature affects the smoothed and unsmoothed properties of the RMO picks.
At Percentage to retain when smoothing, type a percentage value to determine whether you want to apply the mean or median-mean smoothing in the process.
- At 100, the smoothing result is the mean of all the values in the window.
- At 0, the smoothing results is the median of all the values in the window.
- Values in between will perform a median-mean smoothing (sort values, exclude specified % from head and tail, then average).
- At Pick, click Current gather to pick on the current location on the gather, Visible gathers for all visible gathers (if you are displaying multiple gathers in the Gather View), or Entire volume to pick on all the locations in the gather volume. During picking, a progress bar with the estimated processing time will be displayed.
Note: When you do a volume-based 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.