Post on 07-Aug-2018
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SeiSee (2.22)
User’s Manual[1]
Contents
Contents
Introduction
Starting the program
Using the program
Open SEG-Y (SU) or CST file
Open Director !ro"ser panelOpen file in #eco$er mode (SEG-Y onl)
Selection of traces to %e displaed
Trace selection by trace number or header item value
Trace selection by expressionTrace Sorting
Sa$ing data to SEG-Y or C&'SU file
Sa$e trace(s) sample and header $alues to tet file
Eport trace headers $alues to the tet file
Import trace header $alues from tet file
Toggling *+ppl Dela #ecording Time, mode
Displa mode selection
“ Display mode” and “Wiggle Fill” panels“ Colors” panel
Color mode palette setupScaling and gain setup
Scale panelDirection panelChange scale and gain by mouse wheel
Direction panelZoom buttons
De!ault Seismic "iew #arametersSeismic "indo"
$xes labeling setupScrolling the seismic image
Trace selectionDispla. edit headers and data
Trace /eaders "indo"
%eader &tems browsing
Custom header items creation' race Searching
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Trace header editing
Single trace header item modi!ication
Trace headers changing by expression/ardcop "indo"
()*+,- ./012+3)4.5678902, ./012+3)4.5 8):8;.7. < =02;+,) Windows >itmap ? bmp @'rocessing
#rocessing parameters setup
#rocessing panel>and pass !ilter
$utomatic gain control ?$AC@&nversion
'o"er Spectrum "indo"
+ppendices
EpressionsSpecial variables and header item value !unctionBxpression SyntaxBxprBval &nternal Functions ?by >rian $ "anderburg &&@
BxprBval &nternal Constants$pplication &nternal Functions
$pplication &nternal Constants$pplication &nternal "ariables
Trace $alue. gain and $ie" on screen
Simplified SEG-Y file structure
SUC&' files
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Introduction
SeiSee program shows seismic data in SBAE CW#SGE CAA CST !ormatson screen o! your personal computer ?WindowsHIIIE J#E "ista WindowsKE
LE MinuxNWine@#rogram !eaturesO
− standard integer ?HEP bytes@ and &>Q !loat ?P bytes@ sample !ormats
support
− nonstandard integer?R byte@E !loat &BBB ?P bytes@ sample !ormatsH
− CAA Aeovecteur disU SBA !ormat ?dat@
− various seismic display modes ?wiggleE variable areaE variabledensityE color@
− importexport color palettes to text !ile
− scaling seismic imageE gain controlE axes labeling setup
− plot seismic to printer ?plotter@
− image export in Windows >itmap ?bmp@ and #ostScript !ormats
− SBA trace headers display ?!ormats &ntegerVREVHEVPE &BBB
FloatVPEVLE &>Q FloatVP are supported@
− search trace by header item value
− data samples browsing
− text header and binary editor
− band pass !ilterE automatic gain control ?$AC@
− headers consistency checU
− write whole SBA !ile or part o! it to disU in SBA ?&>QH&BBB@ or CW#SG !ormat with ability to select data on base o!
trace index or trace header value or trace header expression and giventime intervalX reversal trace order is also supported #rocessing
parameters can be applied to recorded data ?!ilterE $AC etc@
− export trace?s@ sample and header values to text !ile
− import trace headers values !rom text !ile
− trace shi!t according with “Delay Yecording Time” trace header
value
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− selection o! traces to be displayed by trace index or header value and
by expression
− trace headers change by means expressions
− trace sorting− open and !ix !iles containing wrong data in binary header ?Yecovery
Qode@
− single trace header item editing
− disc directory browsing
− power spectrum calculation and display
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Starting the program
Double clicU program icon by mouseO
Qain window will be shown
Gse button to toggle controls panel visibilityE and !or directory
browser
Command line startup mode is also supported Gse !irst parameter to speci!ya SBA !ile name
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Using the program
Open S!"# (SU) or CS$ %ile
Select menu “File” → “pen”E or press buttonO
Standard “pen” dialog appears Gse it !or to select !ile that you want to browse
Select menu “File” → “Yeopen” to open one o! previously opened !iles
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Open &irector' roser panel
Select “File”→
“pen Directory” menu Standard “pen” dialog appearsGse it !or directory selectionE then select any !ile in it and press “pen”
button
The >rowser panel will be shownO
?nly “valid” SBAE CW#SG and CST !iles will be listed@
To display SBA !ile [ust select it in the list by mouse
The panel buttonsO
Yeturn to the previous directory
Ye!resh directory list
pen directory selection dialog
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Open %ile in *eco+er' mode (S!"# onl')
&! !ile has wrong values in “Sample &nterval”E “\umber samples per datatrace !or reel” .]. “Data Sample Code” items o! the binary headerE the
program opens !ile in Yecovery Qode nly text and binary header will beread &t is necessary to !ix the values and reopen the !ile again
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Selection o% traces to ,e displa'ed
To change the parameters choose “File”→
“Trace Selection” menuE or press button
$race selection ,' trace num,er or header item +alue
Choose “>y \umber” tabE then !ill in selection parameters !orm and press
“Select” buttonE a!ter this the program will start trace selection When it isdoneE press “^” button to display selected data or “Cancel button” to
discard the selection
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$race selection ,' e-pression
Select “>y Bxpression” tabE then enter expression textE and press “Select”
buttonE a!ter this the program will start trace selection Bxpression syntax isdescribed in the “Bxpressions” appendix When it is doneE press “^”
button to display selected data or “Cancel button” to discard the selection
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$race Sorting
To setup sorting select menu “File” → “Trace Sort”E or press button
The dialog has two lists “Selected %eaders” list contains trace header itemnames that will be used !or sortingE and “$vailable %eaders” list holds all
trace headers
%eader order in the “Selected %eaders” list corresponds precedence o! usingthem in sorting
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_+/4+*)4.5 `]);)4,0< 92+<])4.5 /)8- 8])))O
Control Description
$dd selected header item !rom $vailable %eaders to Selected
%eaders list
Yemove selected header item !rom Selected %eaders list
Clear Selected %eaders list
Qove selected header item in Selected %eaders Gp
Qove selected header item in Selected %eaders Down
To select sort mode checU suitable item in “Sort Qode” panel
Control Description
\o \o sorting
$scending $scending sorting
Descending Descending sorting
To apply selected modeE press “Sort” buttonE and then press “^” When sorting is active the “Sort” marU is shown in status barO
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Sa+ing data to S!"# or C/0SU %ile
To save !ile select “File” → “Save $s ” menu item or press button
&t is possible to save all trace or part o! them Fill selection parameters in thedialog Selection parameters are the same as described in “Selection o!
traces to be displayed” chapter
ChecU “Yeversal order” checUbox to save traces in reversal order ChecU “$pply #rocessing” to save data with processing applied
Then press “Save” button When standard “File Save” dialog appearsE use it
to speci!y output !ile “Close” button discards dialog
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Then press “Save” button When standard “File Save” dialog appearsE use it
to speci!y type and name o! output !ile “Close” button discards dialog
The !ollowing data !ormats are supported SBA f &>QFM$TH samples
SBA f &BBBFM$TH samples
CW#SG
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Sa+e trace(s) sample and header +alues to te-t %ile
#rocedure is same as !or Saving SBA !ileE except you need to set“'2+8) Samples Text File” !ile type
To save trace header values together with trace data checU “&nclude %eaders?txt@” checUbox
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-port trace headers +alues to the te-t %ile
To export select the !ollowing menu itemsO
“File”→ “Bxport Trace %eaders to $SC&& !ile”
ChecU “Write Column in!o” i! column in!ormation is needed
#ress “Save” to start export %eader values that are selected in the “Trace
%eaders” window will be exported to output !ile
%ere is structure o! the output !ileO
P 0 F 0 Trace index in file
P 9 F 4 * FFID - Original field record number
P 17 F 4 SP - Energ !ource "oin# numberP $1 F 4 %DP en!emble number
P$&7 F14 'e( I#em 1
E)P SP from %DP +
,----------,----------,----------,----------,----------,----------
1 . 1100 1.19 0/$. 0
$ . 1100 1.$0 0/. 0/.
& . 1100 1.$1 0/7. 1
4 . 1100 1.$$ 1 1/.
. . 1100 1.$& 1/$. $
. 1100 1.$4 1/. $/.
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$t the beginning o! the !ile column in!ormation will be recorded
?i! “Write Column &n!o” is checUed@O
#osition Contents DescriptionR P #nnn
or
BJ#Y
nnn f number that shows byte position o! header item
i! value is expression
space
L Fnn
or
three spaces
nn f number !or the appropriate !ormat
i! value is expression
space
RI text header item description
The next line is column in!o terminator f line that starts with “N” character
%eader item values will be placed a!ter this line
First column contains ordinal number o! the trace ?as it is in !ileE starting!rom R@ The !ollowing columns contain header values
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Import trace header +alues %rom te-t %ile
File to be imported should be in the same !ormat as exported !ile To import header values !rom !ile select the !ollowing menuO
“File”→ “&mport Trace %eaders !rom $SC&& !ile”
#ress “Moad” to start import
Select input !ile and press “pen”
$oggling ppl' &ela' *ecording $ime3 mode
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Sometimes time o! !irst trace sample is de!ined by “Delay Yecording Time”trace header value &t is necessary to switchon “$pply Yecording Delay
%eader” to display seismic line with such traces properly While worUing inthis mode you can note some !ile opening delayE especially i! !ile sije i! big
&! you are sure that traces in current !ile are not shi!ted than you can togglethis mode o!!
To toggle the mode select “File” → “$pply Yecording Delay %eader” menu
item or set checU to
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&ispla' mode selection.
&ispla' mode3 and iggle 4ill3 panels
The modes and corresponding controlsk positions are shown in the !ollowing
table
0ode Controls position Seismic sample
R Wiggle
H Wiggle N #ositive Fill
?"ariable area@
Wiggle N \egative Fill
P "ariable density ?Aray
levels@
Color
Color N Wiggle
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Displa 0ode panel controls Description
Wiggle Wiggle mode
Aray "ariable density mode
Color Color mode
&iggle 1ill panel controls Description
\one \o wiggle !ill
#ositive #ositive !ill
\egative \egative !ill
Colors3 panel
Gse this panel to select colorsO
Colors panel controls DescriptionWiggle Wiggle color
Fill Fill color
Selected Selected trace color
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Color mode palette setup
#ress button to popup “#alette” dialog
The !ollowing buttons use to control the palette listO
!utton Description
Create new palette
Duplicate current palette
Yemove current palette
ChecU all palettes !or export
GnchecU all
Bxport selected palettes to !ile
&mport palettes !rom !ile
>e!ore export to !ile checU reuired palettes in the listO
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When palette is selected in the listE it is applied to the seismic window
>e!ore editing select needed palette in the list
The palette consists o! color marUersX space between two marUers is !illed by linear interpolation o! color
riginally the palette is made o! three marUersO
2 0ar3er Description
R RII Qaximal negative amplitude value
H I Zero amplitude level
NRII Qaximal positive amplitude value
To select a marUer picU it by mouse in the “QarUersMevels” panel
To choose new color !or a marUerE use panel o! colors in the right part o! thedialog Selected color will be shown “Selected Color” !ield To assign the
color to the selected marUerE press “$ssign Color” button
To add a new marUerE press “$dd QarUer” button \ew marUer will be
added between selected and previous marUers
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To remove selected marUerE press “Delete QarUer” button QarUer position can be changed by moving marUer position control by
mouse
To save current changesE press “Gpdate” buttonE and to cancel the changes press “Yeset”
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Scaling and gain setup
Scale panel
Scale panel controls Description
Traces Set trace number per centimeter
Fit seismic section to window horijontally
Time Set time scale ?cmsec@
Fit seismic section to window vertically
Aainw Wiggle Aain control
$utomatically ad[ust current wiggle gainE using
maximal amplitude values o! selected trace ?see
“Trace Selection article”@
Aain8 Color Aain control
$utomatically ad[ust color mode gain
ChecU this i! you need same gain value !or both
modes
To ad[ust a value by mouseE move mouse cursor to the corresponding slider ?
@E then press le!t mouse buttonE and ?Ueeping it pressed@ move
the slider Current value o! the parameter will be shown in edit control thatis on the right o! the sliderE and seismic image will be repainted to re!lect the
changes
&irection panel
Direction panel control Description
\ormal From le!t to right
Yeversed From right to le!t
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Change scale and gain ,' mouse heel
0ouse 'osition during &heel
rotating
+ction
&n the Traces input !iledE
&n the Time $xis
Change horijontal scale
&n the Time input !ieldE
&n the %eaders $xis
Change vertical scale
&n the Seismic Section window Zoom&nZoomout in both directions
&t the Aainw input !ield Change Wiggle mode gain
&n the Aain8 input !ield Change Color mode gain
&irection panel
Control Description
\ormal From le!t to rightYeversed From right to le!t
5oom ,uttons.
!utton Description
Fit all the image to seismic window sije
Zoom by window #ress this button then draw a rectangle on the seismic
window ?move mouse cursor to !irst corner o! the rectangleE press le!t mouse
buttonE and Ueeping it pressedE move mouse to set desired sije@ Selectedregion will be joomed to sije o! the seismic window
Yeturn to previous joom
Zoom in ?R times@
Zoom out ?R times@
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Direction o! scale changing caused by E E buttons depends on the
!ollowing radiobuttons selectionO
!utton DescriptionScale changes in both directions
Scale changes in horijontal direction
Scale changes in vertical direction
&e%ault Seismic 6ie /arameters
Select menu “"iew” → “Set Seismic "iew De!aults” to set de!aults !orseismic section
Select “"iew”→ “Set "elocity "iew De!aults” to set de!aults !or velocity
section ?in SBA !ormat@
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Seismic indo
To show this window select “Seismic” tab
When you move mouse pointer in the seismic windowE values correspondingcurrent position will be shown in status bar at the bottom o! the main
window and in “Qouse #osition %eader >ox” Trc Trace number in the !ile
Time Time ?ms@Smp Sample value ?processing is applied4@
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-es la,eling setup
#ress buttonE to popup $xes dialog
The dialog has two tabs To select headers that should be shown on the top
o! seismicE clicU “Trace $xis ?%eaders@” tab
There are two lists on this tabO Selected %eaders list contains descriptionso! trace header items that will be shown above seismic sectionE and
$vailable %eaders list contains all the SBA trace header items
&tem order in Selected %eaders corresponds to its position on axis ?higher or lower@
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Controls on Trace $xis tabO
Control Description
$dd selected header item !rom $vailable %eaders to Selected
%eaders list
Yemove selected header item !rom Selected %eaders list
Clear Selected %eaders list
Qove selected header item in Selected %eaders Gp
Qove selected header item in Selected %eaders Down
For each item in Selected %eaders you can speci!y start value and stepFor exampleO Select CD# ensemble number” itemE assign start valueRI
and stepRI to it &n this case traces with CD# numbers RIE RRIE HRIE etcwill be labeled
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To setup time axis labeling step clicU “Time $xis” tab
Bnter the step value &! time lines are needed set marU in the “Timelines”checUbox
To accept the changes press “$pply” or “^” button “^” also closes thedialog “Close” button discards any changes and closes the dialog
Scrolling the seismic image
There are two ways to scroll the imageO
− using scroll bars
− dragging by mouse
Qove mouse cursor to start pointE then press Y&A%T mouse button andUeeping it pressedE move the image into desired direction
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$race selection
To switch into selection mode press button &t is the same button that is
used to switch into “#an” mode &mage on buttonE depict mode that will beselected a!ter the button press
While selection mode is chosenE move mouse cursor to desired trace and
press le!t mouse button $s resultE this trace becomes “selected”
Trace header values o! the selected trace will be shown in “>in header”
panel ?see “Display headers” article@
This trace is also used !or automatic gain control
To move trace selection some number traces !orward or bacUward use the!ollowing controlsO
Fill edit control with move step value
#ress button to move !orwardE and to move bacUward
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&ispla'7 edit headers and data
$!ter button is pressedE “&n!o%eaders” panel will be shown in the le!t part o! the seismic windowO
Contents o! the panel depend on which radiobutton is checUed
!utton Contents
Aeneral Aeneral !ile in!ormation
Trace header %eader o! the selected trace
>in header >inary header o! SBA !ile
Text header Text header o! SBA !ile
Trace data Trace data sample values
Spectrum #ower spectrum graph
To change the panel sijeE move mouse cursor to the right boundary $nd
when the mouse cursor is changed into E press le!t mouse buttonE andholding it pressed move panel boundary into desired direction
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Trace header items %ro"sing
Select “Trace %eader” tab to show contents o! the selected trace headerO
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>esides browsing o! Unown header items ?“&tems” tab@E it is also possible to
display trace header as dump o! integer values array !or nonstandard dataanalysis ?“Dump” tab@
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SEG-Y file tet header editing567
Select “Text %eader” tab to show contents o! the text header
Select appropriate line o! the header by mouse then enter changes !romUeyboard
To save the changes press “Gpdate” buttonE or press “Yeset” button to undo
all the changesP
&t is also possible to load text header data !rom text ?$SC&&@ !ile To do this press “From !ile” button or select menu “File” → “Moad Text %eader !rom
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File” To load the data !rom the previous !ileE press small button that is onthe right o! the “From !ile” button
To save the header into text ?$SC&&@ !ile select “File” → “Save Text %eader
to File” menu item &t is also possible to load text header data !rom text ?$SC&&@ !ile To do this
press “From !ile” button or select menu “File” → “Moad Text %eader !rom
File” To load the data !rom the previous !ileE press small button that is on
the right o! the “From !ile” button
To save the header into text ?$SC&&@ !ile select “File” → “Save Text %eader
to File” menu item
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SEG-Y file %inar header editing587
Select “>in %eader” tab to show contents o! the text header
Select appropriate line o! the header by mouse then enter changes !romUeyboard “Sample &nterval”E “\umber samples per data trace !or reel” and
“Data Sample Code” items cannot be changed because they a!!ect to !ileintegrity &! you need nevertheless to edit these itemsE then checU “$llow to
edit all items” box
Qodi!ied lines are highlighted by blue color >ad values are marUed by red
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#rogram will not update !ile till all the bad values are corrected
To save the changes press “Gpdate” buttonE or press “Yeset” button to undoall the changes
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$race 8eaders indo
8eader Items ,rosing
To show this window select “Trace %eaders” and “"iew” tabs
ChecU items in Selection panel that you want to display "alues o! selected
header items will be shown in Data panel
#ressing to button selects all the itemsE and clears all selection
The program checUs !or trace headers consistence &! current trace header
value di!!erence with previous trace header is not eual di!!erence with next
traceE this value is highlighted by red color
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Custom header items creation
The program allows create custom header item description Gse control
panel buttons !or this
The button creates a new header and shows editing dialog window
The button shows editing dialog window !or current header item
The button removes the current item
\oteO you can edit only custom header items
There are two types o! itemsO
• positionalO R or Hbit integerE !rom arbitrary header position
• computableO its value is calculated by mathematical expression
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&n case o! positional item we have the !ollowing dialogO
FieldsO
\ame &tem nameO it should be uniueE it will be used !or header axis
labeling in seismic window and !or table column labeling in the trace
header window
Description %eader item description
#osition >yte position ?!rom R@ !or this item in trace header
Format Select needed !ormat !rom combo boxO &ntegerVREVHEVPE
&BBB FloatVPEVLE &>Q FloatVP
ou can copy position and !ormat !rom existing item to“#osition” . “Format” !ields To do thisE select item in “$vailable %eaders”
list and press button
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To create a computable item select “Bxpression” tab
Bnter an expression that consists !rom numbersE parenthesijesE operators?NV@ and special variables
BxamplesO Bxpression Description
\ current trace number in the !ile
\VH same multiplied by H
H [ust value H
%?HREP@VH integerVP !rom position HR o! trace header ?CD#@ multiplied byH
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9race Searching
Go to end or %eginning of the file
• go to the !irst trace
• go to the last trace
Go to the trace "ith gi$en inde
To activate this mode clicU le!t mouse button over “Trace ” table header
Fill in search number ?\@
Select search condition !rom the listO
• go to trace index o! which is eual o! the search number
• N go \ traces !orward
• go \ trace bacUward
Trace search % header item $alue
To activate this mode clicU le!t mouse button over needed header item name
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?liUe “CD#”@
Fill in search number ?\@
Select search condition !rom the listO
• !ind trace where selected header item value is eual \• N !ind trace where selected header item value is eual current value N \
• !ind trace where selected header item value is eual current value \
• !ind trace where selected header item value is not eual \
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#ress one o! the !ollowing buttonsO
• seuential search !orward
• seuential search bacUward
•
• !ast binary searchKE it worUs only on ordered seuence o! values
?ascended or descended@ ? is not supported@
&! !ile sije is bigE then search may taUe su!!icient amount o! time
#ress button to terminate current search
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$race header editing
Single trace header item modi%ication
Qove mouse pointer to table cell with header item value that you are goingto change and press le!t mouse button
\ame and value o! selected item will be shown on screen
Fill in edit !ield by new item value
and press Gpdate button
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$race headers changing ,' e-pression
%eaders o! selected traces ?SeeO “Selection o! traces to be displayed” article@
can be changed by means mathematical expressions To activate modi!ication window select “Trace %eaders” and “Change” tabs
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ChecU header to be changed in the selection panelE then in data panel clicU
table header corresponding to it in the data panelO
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Then !ill in “Bxpression” !ield with expression text
The !ollowing variables have a special meaningO
"ariable Description
\ rdinal trace number in SBA !ile
M Mast trace number in SBA !ile
Function that returns arbitrary trace header item value is also de!inedO
_?pE!@E where p f item position in the headerE ! f !ormat ?HintegerVHE PintegerVP@
For exampleO %?HREP@ returns CD# number
Toolbar buttonsO
&nserts value o! item currently selected in the selection panel
&nserts current trace number in the expression
&nsert last trace number
Clears expression !ield
Gpdate !ile with new values
Gndo the latest !ile modi!ication
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Yepeat all above !or each item you want to change and then press button
The !ollowing dialog will be shownO
#ress “Gpdate” to change !ile or “Close” to cancel changes
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8ardcop' indo
To show this window select “%ardcopy” tab
:;<=>? @ABD=E;F@G
To print seismic image select “#rint” tab
#ress “Setup” button to choose printer and page sije Standard “#rint setup”dialog will be shown Gse it to setup your parameters &n!ormation aboutselected printer will be shown in “#rinter &n!o” panel
To select orientation o! plot use “%orijontal” and “"ertical” radiobuttons
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&t is possible only part o! seismic sectionE !or that you need to !ill in #rintYegion !ormO
Tmin Qinimal Time ?ms@
Tmax Qaximal Time ?ms@
From tr Start !rom this trace
'0 tr Stop at this trace
Gse “min” and “max” buttons to set minimal or maximal possible values
#ress “$ll” button to print ?export@ whole sectionE and “"iew” button to print Seismic "iew image
To place text label ?one string@ !rom “Mabel” edit control to printout set
marU into checUbox “File name” button puts current !ile name into
edit controlE and “Clear” button empties the control
&! image sije is bigger then page sije then it will be spitted into several
parts
#rint preview panel shows as image is divided into pages &! you changed
display modeE scalingE etcE then current changes also will be re!lected in the preview panel
To print the imageE press “#rint” button The button label changes to “$bort
#rint” #rinting progress will be shown in progress bar at the bottom o! thewindow
To cancel printingE press “$bort #rint” button
While printing other worU with the program is not allowed
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HJKBD> @ABD=E;F@G J;LJ@@ NBD=>; indos itmap (.,mp)
Select “Bxport” tab in “%ardcopy” window
Fill “>itmap Dpi” !ield with dot per inch value !or your bitmap image
&n “Color Qode” select image typeO Hcolor ?color Lbit@ or blacU and
white ?bw R bit@
Then press “Bxport” button When standard “File Save” dialog appearsE use
it to speci!y output !ile “Close” button discards dialog
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/rocessing
#rocessing is applied to trace be!ore it will be shown on screen %ere is the processing modules listO
− band pass !ilter
− automatic gain control ?$AC@
− data inversion ?negation@
/rocessing parameters setup
To set the processing parameters press button or select“#rocessing”→ “#arameters” menu itemE a!ter that “#rocessing” dialog
appears Bnter parameters needed To accept the parameters press “$pply”or “^” button “^” also closes the dialog “Close” button discards any
changes and closes the dialog
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/rocessing panel
Gse the panel to toggle corresponding processing
'rocessing panel item Description
&nversion Data inversion ?\egation@
Filter >and pass !ilter
$gc or \orm $utomatic gain control or \ormalijation
Weight Gse Trace Weighting Factor trace header item
pen “#rocessing” dialog
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and pass %ilter
Bnter !ilter cut !reuencies as it is shown in the picture and checU “Gse
!ilter”E i! you want to use the !ilter
riginal data Filtered data
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utomatic gain control (!C)
&n “Gse \ormalijation” mode maximum amplitude value is calculated !or
trace and each sample is divided to its value &n “Gse $AC” mode “Window length” parameter sets $AC window length
$AC module moves the window down the trace samplebysample andcalculates a scale !actor at each location The scale !actor is eual to the
YQS amplitude in the window
Bnter “Window length” and checU “Gse $AC”E i! you want to use the $AC
riginal data $AC applied
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In+ersion
This module replaces each sample in trace to inversed value ?multiply by
minus one@ChecU “Gse &nversion” to apply the inversion
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/oer Spectrum indo
To show the Spectrum window press button or select menuO
“"iew” → “Spectrum”
?amplitude E !reuency %j@
Gse the !ollowing checU boxes to control spectrum charts curvesO Chec3 !o Description
Whole Section Whole section summary spectrum
Yange Spectrum o! selected region ?see Selection table@
Current Trace Spectrum o! current reace
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To calculate rectangular region spectrum !ill “Selection” table !romUeyboard
When it is done press button
#ress button to !ill the table with current seismic section boundaries
$lso you can select the region by mouse in seismic window f button
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ppendices
-pressions
Special +aria,les and header item +alue %unction
The !ollowing variables have a special meaningO
"ariable Description
\ rdinal trace number in SBA !ile
M Mast trace number in SBA !ile
Function that returns arbitrary trace header item value is also de!inedO
_?pE!@E where p f item position in the headerE ! f !ormat ?HintegerVHE PintegerVP@
For exampleO %?HREP@ returns CD# number
-pression S'nta-
Bxpressions have pretty much the same syntax as they would have on paperE
with the !ollowing exceptionsO
• Bach expression must end with a semicolon This is because the expression
string can actually contain multiple expressions The semicolon is used to
marU the end o! the expression &n our case semicolon at the end o! the
expression can be omitted
Eamples9o PVxNX
o yNHXgPNX
o yrVsin?a@XxrVcos?a@X
• The asterisU qVq must be used to multiply
Eamples9
o yVX :alid
o g?xNR@V?xR@X :alid
o g?xNR@?xR@X In$alid
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Qore than one expression may be contained within an expression string $sshown aboveE each expression must end with a semicolonE even i! only one
expression is in the string The value o! an expression string is the value o!the last expression in the string
Eamlples9
• gKX :alue9 ;
• UjNRX :alue9 <=>
• rPXUXoNrUX :alue9 ?=r-3
Some !unctions may taUe re!erence parameters These parameters are
re!erences to other variables ou can mix re!erence parameters with normal parameters The order o! the normal parameters must remain the same and
the order o! the re!erence parameters must remain the same
Eamples9
• min?REHEEPEmval@X @m$al is a reference to a $aria%le m$al
• min?REHEmvalEEP@X You ma mi them inside li3e this
• min?REHE?mval@EEP@X You ma not nest reference parameters in an "a
Bxpressions may also be nested with parenthesisEamples9
• ysin?xcos?Nmax?PEEVx@@@X
• N?HV?xNy@@X
Bxpressions may also have whitespace characters and comments
Whitespace characters such as newlinesE line!eedsE carriage returnsE spacesEand tabs are ignored Comments begin with the less thansign qq and end
with the greater thansign qq Comments may be nested as well
Eample9
Se# #2e x 3alue
x + d * co!5r6
Se# #2e 3alue
+ d * !in5r6
%ommen# ou# #2i! for no(
Fli" #2e 3alue!
# + x
x +
+ x
S#o" commen#ing ou#
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&! a variable is used in an expressionE but that variable does not existE it is
considered jero &! it does exist then its value is used instead
-pr+al Internal 4unctions (,' rian . 6ander,urg II) The !ollowing !unctions are provided with BxprBvalO
1unction
0in
+rg
s
0a
+rgs
0in
#ef
+rg
s
0a
#ef
+rgs
#esultComment
abs?v@ R R I I$bsolute value o! v
abs?P@ returns P
mod?vEd@ H H I I Yemainder o! vdmod?HEH@ return IH
ipart?v@ R R I IThe integer part o! v
ipart?H@ returns
!part?v@ R R I IThe !ractional part o! v
!part?H@ returns IH
min?vE@ R \on
eI I
The minimum number passed
min?EHEEHEK@ returns
max?vE@ R \on
eI I
The maximum number passed
max?EHEEHEK@ returns K
pow?aEb@ H H I IThe value a raised to the power b
pow?HERK@ returns HRK
srt?a@ R R I I The suare root o! a srt?R@ returns P
sin?a@ R R I IThe sine o! a radians
sin?R@ returns around IK
sinh?a@ R R I IThe hyperbolic sine o! a
sinh?R@ returns around HRH
asin?a@ R R I IThe arcsine o! a in radians
asin?I@ returns around IHP
cos?a@ R R I IThe cosine o! a radians
cos?R@ returns around IIKIK
cosh?a@ R R I IThe hyperbolic cosine o! a cosh?R@ returns
around HH
acos?a@ R R I IThe arccosine o! a in radians
acos?I@ returns around RIPK
tan?a@ R R I IThe tangent o! a radians
tan?R@ returns around RPRIR
tanh?a@ R R I I
The hyperbolic tangent o! a tanh?R@ returns
around II
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atan?a@ R R I IThe arctangent o! a in radians
atan?I@ returns about IHR
atanH?yEx@ H H I IThe arctangent o! yxE with uadrant correction
atanH?PE@ returns about IHK
log?a@ R R I I The base RI logarithm o! alog?RII@ returns H
powRI?a@ R R I IRI raised to the power o! a
powRI?H@ returns RII
ln?a@ R R I IThe base e logarithm o! a
ln?HL@ returns around RII
exp?a@ R R I Ie raised to the power o! a
exp?H@ returns around KL
logn?aEb@ H H I IThe base b logarithm o! a
logn?REH@ returns P
ceil?a@ R R I IYounds a up to the nearest integer
ceil?H@ returns P
!loor?a@ R R I IYounds a down to the nearest integer
!loor?H@ returns
rand?@ I I I IYeturns a number between I up to but not
including R
random?aEb@ H H I IYeturns a number between a up to and including
b
srand?a@ R R I I
Seeds the random number generator with a
valueYeturn value is unUnown
randomije?@ I I I I
Seed the random number generator with a value
based on the current time
Yeturn value is unUnown
deg?a@ R R I IYeturns a radians converted to degrees
deg?RP@ returns around RKI
rad?a@ R R I IYeturns a degrees converted to radians
rad?RLI@ returns around RPH
recttopolr?xEy@ H H I IYeturns the polar radius o! the rectangular coordinates
recttopolr?HE@ returns around I
recttopola?xEy@ H H I I
Yeturns the polar angle ?IH#&@ in radians o!
the rectangular coordinates
recttopola?HE@ returns around ILL
poltorectx?rEa@ H H I I
Yeturns the x rectangular coordinate o! the
polar coordinates
poltorectx?ER@ returns around IHRH
poltorecty?rEa@ H H I I
Yeturns the y rectangular coordinate o! the
polar coordinates poltorecty?ER@ returns around HH
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i!?cEtE!@ I I
Bvaluates and returns t i! c is not II Blse
evaluates and returns !
i!?IREHRE@ returns HR
select?cEnEjEp@ P I I
Yeturns n i! c is less than II Yeturns j i! c is
II &! c is greater than II and only threearguments were passedE returns j &! c is greater
than II and !our arguments were passedE return
p
select?EREPE@ returns
eual?aEb@ H H I IYeturns RI i! a is eual to b Blse returns II
eual?EH@ returns II
above?aEb@ H H I IYeturns RI i! a is above b Blse returns II
above?EH@ returns RI
below?aEb@ H H I IYeturns RI i! a is below b Blse returns II
below?EH@ returns II
avg?aE@ R \on
eI I
Yeturns the average o! the values passed
avg?EE@ returns P
clip?vEminEmax@ I I
Clips v to the range !rom min to max &! v is less
than minE it returns min &! v is greater than max
it returns max therwise it returns v
clip?EREH@ returns H
clamp?vEminEmax
@ I I
Clamps v to the range !rom min to maxE looping
i! needed
clamp?LHEREPK@ returns RP
pntchange?sideRo
ldE sideHoldE
sideRnewE
sideHnewE oldpnt@
I I
This is used to translate points !rom di!!erent
scale &t worUs no matter the orientation as long
as the sides are lined up correctly
pntchange?REREIEPLIEI@ returns RHI ?x
example@
pntchange?REREPLIEIEI@ returns I ?y
example@
poly?xEcRE@ H \on
eI I
This !unction calculates the polynomial x is the
value to use in the polynomial cR and on are the
coe!!icients
poly?PEEEEREP@ returns HRLsame as VPP N VP N VPH N RVPR N PVPI
and?aEb@ H H I I
Yeturns II i! either a or b are II Blse returns
RI
and?HREII@ returns II
or?aEb@ H H I I
Yeturns II i! both a and b are II Blse returns
RI
or?HREII@ returns RI
not?a@ R R I IYeturns RI i! a is II Blse returns II
not?I@ returns II
!or?initEtestEincEaRP \on I I This !unction acts liUe a !or loop in C First init
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E@ e
is evaluated Then test is evaluated $s long as
the test is not IIE the action statements ?aR to
an@ are evaluatedE the inc statement is evaluatedE
and the test is evaluated again The result is the
result o! the !inal action statement
!or?xIEbelow?xERR@ExxNREyyNx@ returns I?i! y was initially II@
many?exprE@ R \on
eI I
This !unction treats many subexpressions as a
single ob[ect ?!unction@ &t is mainly !or the q!orq
!unction
!or?many?[EUR@Eabove?[VUEIIIR@Emany?[[N
EUUH@EI@