SegDSee 4

User’s Manual



Contents 1

Introduction. 2

Starting the program.. 2

Using the program.. 3

Open folder to browse SEG-D, SEG_B files. 3

Display mode selection. 5

Scaling and Gain Setup. 6

Scale Panel 6

Change scale and gain by mouse wheel 7

Zoom buttons. 7

Seismic Channel Sets Display. 8

Display seismic file headers. 10

Seismic Data Processing. 12

Processing parameters setup. 12

Band pass filter 13

Automatic gain control (AGC) 14



The SegDSee program displays headers and seismic data from disk SEG-D or SEG-B file

- Single shot file and Lacey Tape on Disk (LTOD) encapsulation is supported

- Currently supported formats: SEG-D Rev 0 - 3.1 and Standard SEG-B


Starting the program


Double click program icon by mouse:


Main window will be shown



Using the program

Open folder to browse SEG-D, SEG_B files


Select “File” “Open Directory” menu item. “Open” dialog will be shown.

Use it for directory selection.


Buttons in file browser panel:


* - Return to the previous directory

* - Refresh directory list

 - Open directory selection dialog




To display needed file select it by mouse. Also it is possible to select file by and arrow keys from keyboard.


Selected valid SEG-D or SEG-B file will be displayed in Data Panel.


For going to upper directory level double click or press Enter on  item in the list.


LTOD file content is opening by double clicking or pressing Enter on corresponding item.



To exit from LTOD content list double click or press Enter on  item.




Display mode selection.


“Display mode” and “Wiggle Fill” panels



The modes and corresponding controls’ positions are shown in the following table





Controls position

Seismic sample





Wiggle + Positive Fill (Variable area)


Wiggle + Negative Fill


Variable density (Gray levels)




Color + Wiggle



Display Mode panel controls



Wiggle mode


Variable density mode


Color mode


Wiggle Fill panel controls



No wiggle fill


Positive fill


Negative fill



Scaling and Gain Setup

Scale Panel





Scale panel controls



Set trace number per centimeter

Fit seismic section to window horizontally


Set time scale (cm/sec)

Fit seismic section to window vertically


Wiggle Gain control

Automatically adjust current wiggle gain, using maximal amplitude values of selected trace


Gain control


To adjust a value by mouse, move mouse cursor to the corresponding slider (), then press left mouse button, and (keeping it pressed) move the slider. Current value of the parameter will be shown in edit control that is on the right of the slider, and seismic image will be repainted to reflect the changes.




Change scale and gain by mouse wheel



Mouse Position during Wheel rotating


In the Traces input filed,

In the Time Axis

Change horizontal scale

In the Time input field,

In the Headers Axis

Change vertical scale

In the Seismic Section window

Zoom-In/Zoom-out in both directions

It the Gain-w input field

Change Wiggle mode gain

In the Gain-с input field

Change Color mode gain



Zoom buttons.




Fit all the image to seismic window size


Zoom by window. Press this button then draw a rectangle on the seismic window (move mouse cursor to first corner of the rectangle, press left mouse button, and keeping it pressed, move mouse to set desired size). Selected region will be zoomed to size of the seismic window.

Return to previous zoom

Zoom in (1.5 times)

Zoom out (1.5 times)



Seismic Channel Sets Display


To display seismic view panel select Channel Sets tab.




When you move mouse pointer in the seismic window, values corresponding current position will be shown in status bar at the bottom of the main window



Time (ms)

on mouse moving


Channel set #

on trace selecting


Cannel #

on trace selecting



on trace selecting


Shot Point # (if exists)

on trace selecting



Left panel contains channel set list:



The panel has the following controls:





Selection mode

Allall channel sets are always selected , Singleonly marked

unmark all sets

in Single mode

mark all sets

in Single mode


In  “All” selection mode  all channel sets always will shown


In “Single” mode you should check  channel sets, which need to be shown and uncheck others.



Display seismic file headers


To activate headers panel selectHeaders tab.




In the left panel, headers list is shown, at the right – content of the selected header.


 “Common info” item is not a header, it holds common description of current SEG-D or SEG-B file.



At the top of content window selected header bytes are displayed (in hexadecimal and ASCII formats), and after that these data are shown in parsed form.


Header name

General Header Block #1


Data Dump

00000000 | 01 20 80 15 12 34 56 78 90 12 98 02 43 21 06 04 | .....4Vx....C!..

00000016 | 34 00 03 00 00 00 20 10 00 80 60 01 05 00 13 53 | 4.........`....S



File Number F : 0120

Format Code Y : 8015 [20 bit binary demultiplexed]

General Constants K : 123456789012

Year YR : 98

Num add bocks in gen header GH : 0

Julian day DY : 243

Hour of day H : 21

Minute of hour MI : 06

Second of minute SE : 04

Manufacturer's code Mc : 34 [Syntron, Inc. 1993]

Manufacturer's serial nb Ms : 0003

Bytes per scan B : 000000

Base scan interval I : 32 [20] [2 ms]

Polarity P : 1 [Zero]

S/B exponent SB : 0 [000]

Record type Z : 8

Record length R : 060 [6144 ms]

Scan types per record STR : 01

# of chan sets per scan type CS : 05

# of sample skew 32 byte ext SK : 00

Extended header length EC : 13

External header length EX : 53



Seismic Data Processing


Processing is applied to trace before it will be shown on screen. Here is the processing modules list:


-        band pass filter

-        automatic gain control (AGC)


Processing parameters setup

To set the processing parameters press  button or select “Processing” ® “Parameters” menu item, after that “Processing” dialog appears. Enter parameters needed. To accept the parameters press “Apply” or “OK” button. “OK” also closes the dialog. “Close” button discards any changes and closes the dialog.






Band pass filter



Enter filter cut frequencies as it is shown in the picture and check “Use filter”, if you want to use the filter.


Original data

Filtered data



Automatic gain control (AGC)


In “Use Normalization” mode maximum amplitude value is calculated for trace and each sample is divided to its value.


 In “Use AGC” mode “Window length” parameter sets AGC window length. AGC module moves the window down the trace sample-by-sample and calculates a scale factor at each location. The scale factor is equal to the RMS amplitude in the window.




Enter “Window length” and check “Use AGC”, if you want to use the AGC.


Original data

AGC applied
























© Sergey Pavlukhin

Yuzhno-Sakhalinsk, Russia