Seismic Studio Tutorial - Part 2

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Seismic Studio Tutorial - Part 2Trace
Visualization and Refraction Picking

• Boulder, Colorado USA
• May, 2004

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Trace Display Windows

• Available under Pick on the Menu Bar

• Three types of trace display windows available
• Conventional
• Offset limited Inline-Crossline
• Guided picking

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Conventional Pick Window

• Shows one record at a time
• Is map-driven
• Can display in source, detector, bin or common
  offset planes
• Can apply filter and gain
• Can display geometry error vectors
• Can display all 3D lines or one line at a time
• Can be modified to display traces in different
  colors
• Is used to pick refracted arrivals

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Control Pane 1
Trace Display Pane
Control Pane 2
Attribute Display Pane
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Control Pane 1

• Tab 1 Base map can display map view of any
  database value
• Tab 2 Trace info can track trace info for any
  trace in Trace Display Pane
• Tab 3 Source info can track source database
  info for any trace in Trace Display Pane
• Tab 4 Error vectors can show geometry error
  vectors for current source or detector gather
• Tab 5 Detector info can track detector
  database info for any trace in Trace Display Pane

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Control Pane 2

• Tab 1 Options user can change planes, change
  map view, change mouse mode, etc.
• Tab 2 Hot Keys user can map picking and
  navigation to any key on keyboard
• Tab 3 Map can display map view of any
  database value (same as Base map in Control Pane
  1)
• Tab 4 Error vectors can show geometry error
  vectors for current source or detector gather
  (same as error vector tab in Control Pane 1)
• Tab 5 Pilot interactive control of
  autopicker.

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Click on map to go to closest gather
Resize bars click and drag
Change display plane here
Change map to any value in database
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You can plot one attribute at a time or you can
label several attributes at once in any sub-plot
pane.
Right-click on either sub-plot pane to select
attribute
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How to modify the trace display

• This next part will show you how to change the
  trace display by applying complex moveout.
• In Seismic Studio this is called Defining an LMO
  trend.

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To apply complex moveout, click here
Click on Define LMO trend
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Traces automatically displayed by offset/time
Click

1. Click-drag mouse along the trend you want to
   center in your window.
2. Click the mouse when you want to change slope.
3. Double-click to finish the lines.

Double-click
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Set values here, then click check box
Linear trend has been applied
Now we will zoom in by changing our time window
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You can toggle the time window on/off by clicking
on the T button
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How to modify the trace display

• This next part will show you how to change the
  trace colors

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How to modify the trace display

• This next part will show you how to limit the
  trace display to a user-specified offset range.

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Fill-in offset range and click Limit button
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How to pick refracted arrivals

• This next part will show you how to limit the
  trace display to a user-specified offset range.
• The first thing you will learn is how the picking
  controls work and how to customize them.

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Picking background information

• Seismic Studio can pick several types of events
  peak, trough, zero crossings, etc.
• The pick event type is set in Options under the
  Pick options tab.
• If you are zoomed into a trace window, most pick
  options will be limited to the traces in the
  zoomed zone.
• For a hot key to function, the mouse must be
  located within the trace display part of the pick
  window.

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Lets resize the hot key pad by grabbing the
separator bar and sliding it up
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Until you change the function to another keyboard
character, typing H will now kill picks in both
directions within the visible traces.
To map a pick function to a keyboard key, move
your mouse over the button and push a key. For
example, to map Kill Left and Right to the
letter H move the mouse to the box and press H.
H
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Summary of hot key functions

• Add single picks a single event on the closest
  trace to the mouse
• Kill single kills the pick (if any) on the
  closest trace to the mouse.
• Add left picks an event starting at the mouse
  time and picks all traces to the left of the
  mouse location.
• Add right picks an event starting at the mouse
  time and picks all traces to the right of the
  mouse location.
• Kill left kills a pick starting at the closest
  trace and kills all picks to the left of the
  mouse location.
• Kill right kills a pick starting at the closest
  trace and kills all picks to the right of the
  mouse location.

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Summary of hot key functions

• Add left and right picks a single event on the
  closest trace to the mouse and then adds picks to
  traces in either direction.
• Kill left and right kills the pick (if any) on
  the closest trace to the mouse and kills picks in
  either direction.
• Prev group moves to the previous group within
  the current gather. Only functions if groups
  exist and grouping is turned on.
• Next group moves to the next group within the
  current gather. Only functions if groups exist
  and grouping is turned on.
• Prev gather moves to the previous gather.
• Next gather moves to the next gather.
• Ctrl pt add picks events closest to rubberband
  lines until End ctrl pt hot key is clicked.
• Ctrl pt kill kills picks closest to rubberband
  lines until End ctrl pt hot key is clicked.
• End ctrl pt finishes the rubberband action and
  picks events or kills picks on affected traces.

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Summary of hot key functions

• Kill trace flags a trace as dead in the trace
  database
• Undo trace kills will flag as live traces that
  have been flagged as dead.
• Accept previous picks uses picks from previous
  gather to pick events on the current gather.
• Zoom when hot key is clicked and mouse is
  dragged a zoom window is defined. When hot key
  is lifted the window is zoomed.
• Flip polarity changes polarity of nearest trace
  to mouse.
• Pick on zero picks the closest event to zero
  time on all traces for the current group or
  gather.

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Adds a single pick closest to the mouse time
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Hot key (number) 1 adds picks to left of
closest events to the mouse time
Put mouse here and click 1 on keyboard
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Ctrl pt add is mapped to the left mouse button
Blank hot key for End Ctrl pt means that double
click will end the ctrl pt function (this is a
special function)
Double click to end
Left click mouse and drag
Left click mouse and drag
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Conventional pick window

• This window is the heart of Seismic Studio
• As you pick, all picks go immediately to the
  database
• Picks drive the refraction solution
• Exercise the pick windows flexibility
• Modify the map
• Modify the trace appearance
• Modify the hot keys
• Practice various picking types
• You can have any number of pick windows
• but it can be confusing to have more than 3.
• each window can be in a different plane

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Guided picking

• Special window for guided picking
• User provides guide times with mouse
• Window automatically picks each gather
• Guide functions do not update from gather to
  gather
• User can update curves at any time

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Traces are sorted by signed offset along X-axis
Click - drag
User provides guide functions to pick gather
Move to the next gather using your hot key
Click - drag
Click - drag
Double click
Click - drag
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The next gathers are picked automatically using
the guides you set
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If picks drift off, reset guide with mouse
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Inline-Crossline Azimuth-LimitedCommon-Offset
pick window (ICALCO)

• The conventional pick window and the guided pick
  window show one gather at a time.
• ICALCO provides a look at traces within a
  specified offset range, within a specified
  azimuth range for any inline/crossline.
• In effect, this gives you a look at traces at
  similar distances and at similar angles across
  the breath and width of the entire 3D survey.

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If you want ot azimuth limit also, select your
azimuth range here and check the apply box
Select your offset range here
Select your inline and crossline here by clicking
on the map
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As you move your mouse along the traces you can
see a vector move on the map
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Push the separator to the right to see the
parameter panel better
Recommend clicking the check box and setting the
X-Axis to Trace/FBinX
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Next, well zoom in on the refractor to center it
better in the window. Click on the right arrow to
scroll the tabs so you can see Time Limit and
Trace Shift
Recommend clicking the check box and setting the
Y-Axis to Trace/FBinY
then click on Trace Shifts
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For these data, we will use an LMO velocity of
6500 m/s.
Click on Time Limit
Notice that the traces have shifted in time
Next you will center the data in a time-limited
window
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Set min and max time values, then click on Limit
trace display by time
So far we are only looking at our common offset
display along the inline direction. Lets
display the crossline, also.
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Click on Display Crossline gather
You can also display both inline and crossline
simultaneously
Click on the Crossline Only tab
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How to save copies of picks to the trace database

• At any time, the user can back up their picks to
  the trace database as a copy
• This can come in handy if you want to try some
  automatic or semi-automatic picking technique
  such as prediction picking. You can restore your
  original picks at any time from the back-up
  picks.

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Pick copy dialog
Under Pick
Go to Pick copy dialog
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Copying user picks to backup
Active picks are called User picks
The pick copy dialog defaults to back-up mode
Back up picks are stored in the trace database
Begin copy copies from User to Backup.
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Copying backup picks to user picks
Highlight Backup in the Copy Picks From section.
Highlight User in the To One of These section.
Begin copy restores from Backup to User.
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Picking Tutorial - Conclusions

• Youve been introduced to 3 kinds of pick windows
• 1. Conventional
• 2. Guided
• 3. Inline-crossline azimuth-limited common
  offset

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Showing more than one set of picks in the pick
windows

• Under picker options, you can optionally display
  any set of picks in the trace database.
• You can assign each set of picks a different
  symbol shape, size and color.
• Pick set symbol selection is found under Picker
  Options dialog under the pick options tab (See
  Options in the conventional picker).

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Click on the pick version again to see False
turn to True
To display a set of picks, click on the pick
version
Check the pick version visible box
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Picking Tutorial - Conclusions

• Picks made in any pick window are all consigned
  immediately to the trace database.
• Therefore, any picks made in one window are
  immediately displayed in other pick windows.
• You can make as many backup copies of picks as
  you want.