Lynx Seisview

A seismic file can be opened for viewing in three ways:

1. Select the File-Open menu option, and select the file in the open file dialogue
2. Specify the file on the command line when starting SEISVIEW
3. Drag the file from an explorer window, and drop it on SEISVIEW

SEISVIEW can conveniently be started by double clicking its icon in Launcher, or from a command line or script.

The Windows 32bit GUI executable file is SEISVIEW.EXE.

SEISVIEW can be run with a command line similar to the following:

SEISVIEW [TRACEFILE]

where:
TRACEFILE is an optional seismic data file. If no TRACEFILE is specified, you can select one from the dialogue box which appears when you click the File-Open menu or tool bar button.

SEISVIEW requires a licence activation file from Lynx. If no activation file is found, SEISVIEW will run in evaluation mode, and display a splash screen on startup - to remove this splash screen, please purchase a licence.

SEISVIEW can be used at the command prompt and in batch files to generate seismic image plots.

The Windows 32bit console mode executable file is SEISVIEWCONSOLE.EXE.

Command line syntax is as follows:

SEISVIEWCONSOLE TRACEFILE OPTIONS

where:

Examples of SEISVIEWCONSOLE command-lines for generating image tiles might look like this:

SeisviewConsole.exe c:\temp\118.stk -jpeg=C:\temp\118-greyinterp-tile1.jpg -noborders -traces=1,100 -samples=1,200 -displaystyle=6 -zoom=200
SeisviewConsole.exe c:\temp\118.stk -jpeg=C:\temp\118-greyinterp-tile2.jpg -noborders -traces=1,100 -samples=201,400 -displaystyle=6 -zoom=200
SeisviewConsole.exe c:\temp\118.stk -jpeg=C:\temp\118-greyinterp-tile3.jpg -noborders -traces=101,200 -samples=1,200 -displaystyle=6 -zoom=200
SeisviewConsole.exe c:\temp\118.stk -jpeg=C:\temp\118-greyinterp-tile4.jpg -noborders -traces=101,200 -samples=201,400 -displaystyle=6 -zoom=200
	 	 

SEISVIEWCONSOLE requires a licence activation file from Lynx. If no activation file is found, SEISVIEWCONSOLE will exit immediately.

SEISVIEWCONSOLE operates silently. No status updates are written to standard output in normal operation. By default, all command lines are logged in the file SEISVIEWCONSOLE.LOG in your user profile %APPDATA%\LynxData folder. This log file also records error messages. Logging is can be controlled by editing a parameter in SEISVIEW.INI [startup] section: set console log=0 to turn logging off, or set console log=1 to turn logging on.

Display style - select the trace display type from the following options:

• VA Variable area only
• Wiggle Wiggle trace only
• VA/Wiggle Varible area with wiggle trace overlay
• Greyscale Sample Greyscale black (high amplitude) to white (low amplitude) variable density sample display
• Blue-White-Red Sample Blue (high amplitude) to white to red (low amplitude) sample display.
• Blue-White-Red Sample/Wiggle Blue to white to red colour sample display with wiggle trace overlay
• Greyscale Interpolated Greyscale black (high amplitude) to white (low amplitude) variable density subsampled to individual pixels
• Blue-White-Red Interpolated Blue (high amplitude) to white to red (low amplitude) display sub-sampled to individual pixels
• Orange-White-Black Interpolated Orange (high amplitude) to white to black (low amplitude) display sub-sampled to individual pixels
• Green-White-Brown Interpolated Green (high amplitude) to white to brown (low amplitude) display sub-sampled to individual pixels

See also the Options - Show Options menu.

Horizontal Scale - the approximate horizontal trace scale, eg 1:25000 will give a 1mm trace spacing if the input trace file has a CDP spacing of 25m. For Lynx Trace files and Lynx-variant SEGY files, the trace spacing stored in the binary header will be used to calculated the trace spacing from the horizontal scale set here. For SEG-Y files where the trace spacing is unknown, a default value of 25m is assumed. This horizontal scale will be used for generated full-scale plots and JPEG output.

Vertical Scale - the approximate vertical scale on the screen, and for full-scale plots (and JPEG output) in the units defined below.

Vertical Scale Units - select the units for the vertical scale: either centimetres per second or inches per second.

Amplitude Factor - the amplitude factor f is calculated relative to RMS, the root mean square amplitude for the input data traces. The display amplitude is adjusted so that RMS = 3 x trace spacing and then multiplied by f. Setting f = 1.0 should give a reasonable looking VA/Wiggle display. Colour and greyscale displays are such that 3 x RMS is equal to the maximum range of the palette. Setting f to greater than 1.0 will increase the saturation and may cause clipping. Why three times? - because the peak-to-peak amplitude of normally distributed samples will be approx 2 root 2, or 2.828 times the RMS. That's near enough 3, to geophysical accuracy.

Amplitude Scale - select from:

• Auto - the RMS amplitude of the input data will be calculated and used in the amplitude factor calculation above. Most of the time, this will work quite well.
• Fixed - a fixed input amplitude will used to scale the data. This amplitude shoud be entered below.

Peak Amplitude - enter the amplitude value to correspond with one trace spacing (VA or Wiggle displays), or to the maximum range of the palette (greyscale or colour display)

Trace Clip Amplitude - for wiggle-trace display modes, the maximum allowed deflection of a trace from its zero line, measured in trace spacings. Amplitudes larger than this will be clipped ie set to this value.

Plot direction - controls the horizontal orientation of the display:

• LtoR - plot the traces from the seismic file from left to right
• RtoL - plot the traces from right to left

Display Overview at startup - Yes/No
Set to "Yes" to ensure that the overview is visible on startup

Upper trace scale - select from:

• None - no upper trace scale will be displayed
• Trace - sequential trace numbers, starting at 1
• CDP - sequential CDP numbers for 2D seismic profiles. For Lynx Trace Files and Lynx-variant SEG-Y files, the first CDP value are read from the binary header. For 3D seismic data see Seismic 3D Inline Display.
• Shotpoint - see the Shotpoint Source page below
• Distance - cumulative distance along the profile, using the nominal trace separation read from the binary file header (for Lynx Trace Files and Lynx-variant SEG-Y only).

Set the type of scale used for the upper scale bar, above the trace display. The scale-type chosen here will also be used to show the current X-mouse-position in the status bar when the mouse is moved over the viewer window.

Upper trace scale Units - select the units for the upper trace scale (only activated when the upper trace scale is distance)

Lower trace scale - select from:

• None - no upper trace scale will be displayed
• Trace - sequential trace numbers, starting at 1
• CDP - sequential CDP numbers for 2D seismic profiles. For Lynx Trace Files and Lynx-variant SEG-Y files, the first CDP value are read from the binary header. For 3D seismic data see Seismic 3D Inline Display.
• Shotpoint - see the Shotpoint Source page below
• Distance - cumulative distance along the profile, using the nominal trace separation read from the binary file header (for Lynx Trace Files and Lynx-variant SEG-Y only).

Set the type of scale used for the lower scale bar, above the trace display
For shotpoint scales, see the Shotpoint Source parameter page.

Lower trace scale Units - select the distance units for the lower trace scale (only activated when the lower trace scale type is distance)

Left scale units - select from
Select from: msecs, microsecs, secs, samples)
Type of scale used for the vertical left time scale bar. The scale-type chosen here will also be used to show the current Y mouse-position in the status bar when the mouse is moved over the viewer window.

Right scale units
Select from: msecs, microsecs, secs, samples
Type of scale used for the vertical right time scale bar

This parameter page is displayed when you select 'Shotpoints' for either the upper or lower trace scales (above). Use this page to specify how shotpoint information for 2D seismic lines is read from the current seismic data file.

Shotpoint Source - select from:

• Calculated - use the first shotpoint and shotpoint increment read from the binary file header of Lynx Trace Files and Lynx-variant SEG-Y files. This is the fastest and most reliable way of displaying shotpoint information. For standard SEG-Y files these values are not present in the binary header, so default values will be used, and the displayed shotpoints will revert to trace numbers.
• Trace Headers - shotpoint values will be read from the headers of individual traces as required. This may slow down the display considerably, but allows irregular/discontinuous shotpoint sequences to be displayed. Shotpoint values are usually stored as integers in SEG-Y trace headers (due to limitations in the SEG-Y standard), so this may result in duplicate shotpoint values.

SP Header Configuration - when the shotpoint source is Trace Headers, select the configuration to use to read shotpoint values:

• Lynx TR - read auxiliary shotpoint values from trace headers for Lynx Trace Files. This option has undefined behaviour for SEG-Y files.
• SEGY Standard & REV1 - read shotpoint values from the standard trace header locations for standard SEG-Y files and SEG-Y Revision 1 files. This option has undefined behaviour for Lynx Trace Files.
  For Standard SEG-Y files, the shotpoint value for each trace is stored as an integer in bytes 17-20. This may result in adjacent traces storing the same shotpoint value (due to rounding). SEG-Y Revision 1 defines new header slots for shotpoint storage, to work around this problem of duplicated shotpoint values in standard SEG-Y; for SEG-Y Revision 1, shotpoint values are stored as an integer in bytes 197-200, with a shotpoint scalar value stored in bytes 201-202, allowing non-integer shotpoint values to be stored for each trace.
• Custom SEGY - read shotpoint values from a user-defined trace header slot, using the options below. This option is not yet implemented.

SP Value Hdr Byte Offset - 1-based byte offset for each trace header - default 17.

SP Format - select from Integer, Floating Point

Integer Type - 2-byte, 2-byte Rev, 4-byte, 4-byte Rev

Float Type - IEEE, IEEE Rev, IBM, IBM Rev

SP Value Scalar - None, Constant, Header

SP Scalar Constant - default 0

SP Scalar Hdr Byte Offset - default 201

SP Scalar Integer Type - 2-byte, 2-byte Rev, 4-byte, 4-byte Rev

Show timing lines - Yes/No - turn on or off the display of horizontal time lines over the seismic display. Timing lines can be useful when generating plots, but are less useful for on-screen display, as the cursor position is displayed in the status bar underneath the seismic display.

Timing line interval, msec - set the interval for timing lines - default 1000.

Show trace lines - Yes/No - turn on or off the display of vertical trace lines over the seismic display.

Trace line interval, traces - set the interval for trace lines - default 100.

Line colour - select the colour for timing lines and trace lines - default Black.

Like all Lynx Exploration Archivist application programs, SEISVIEW has a corresponding INI file in the Lynx system directory where it was installed, or optionally in the user's CUSTOM directory.

The [STARTUP] section of SEISVIEW.INI file contains program constants which are applied as the program starts up.To alter startup behaviour, these can be edited either manually in a text editor such as Notepad , or through the LEACfg utility.

width=www determines SEISVIEW's width, www in pixels at startup.

height=hhh determines SESIVIEW's height, hhh in pixels, at startup

overview size=sss determines the initial width sss of the overview window in pixels. The height is scaled to reflect the aspect ratio of the section.

Input file format error - the input file format could not be opened - the format could not be recognised, or data could not be read from the file.