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Коррекция формы сигнала по контрольному прибору.

Correction of pulse shape by reference geophone.

FRMCOR Интерактивная обрабатывающая программа.

Вызов из главного меню UNIVERS:

    Standard processing -> Correction of pulse shape by reference data

Description

Session

The call of the program is carried out with the help of a select of the main menu item UNIVERS Standard processing - > Correction of pulse shape by reference data Correction by reference data or from the command line FRMCOR&

After start of the program the main panel of the program Correction of excite pulse form opens. For calculation and application of the corrective filter it is necessary to carry out the following steps of processing.

  1. To establish the project (if it it is necessary). The project in system UNIVERS, as a rule, is established by default. To press the button File- > Project...
  2. To load input modification with the depth sonde traces. For this purpose it is necessary to press the button File of the main menu in the main panel and then consistently to press buttons Open- > Depth Sonde... If the project was not established, in the appeared panel Project Selection it is necessary the project to establish and then in the panel Depth sonde modification by the mouse to select input modification and to press the button OK. If the project was established, the panel opens at once. The input modification is loaded and is drawn in a field of traces of the main panel. If the type of loaded modification 'D', 'C', 'A', ' S, in a line of the information in the bottom of the main panel is deduced the message: Input Modification of Depth Sonde < a name of modification > was set! If the type of input modification differs from specified, in a line of the information the message is deduced: Warning! Depth sonde modification type is ' %c ', must be ' D, C, A, S'! If the input modification was loaded wrongly, it is necessary to press the button Close and it to reload.
  3. To load input modification with traces of the reference geophone. The given modification is loaded after pressing buttons File- > Open > Reference Geophone... And selection modification in the panel Control data modification also is drawn in a field of traces. If the type of loaded modification 'C', in a line of the information the message is deduced: Input Modification of Reference Geophone < a name of modification > was set! If the type of input modification differs from 'C', in a line of the information the message is deduced: Warning! Control data modification type is '%c', must be 'C'! If the input modification was loaded wrongly, it is necessary to press the button Close and it to reload.
  4. To load an input hodograph for traces of the reference geophone. For this purpose it is necessary to press the button Hodograph in the main menu and then button Load... The button Hodograph will be unblocked only after the definition of input modification of the reference geophone. After pressing the button Load in the appeared panel Load Cont. Dev. Hodograph it is necessary to select an input hodograph of the reference geophone. Preferably to select a hodograph obtained after correlation on the program STACAL and a having type Cont. Dev. hodograph. Probably also usage of a hodograph having a type Wave hodograph. After pressing the button OK the hodograph is drawn in a field of traces. In a line of the information the message < a name of a hodograph > was loaded successfully is deduced.

    Loaded hodograph it is possible to see in the increased kind, to edit, pressing the left key of the mouse in a mode Edit or Rule (Pencil) in the panel of icons in the bottom of the main panel. Besides it can be moved on the set size of shift (ms), using a mode Tune, and to achieve its optimum arrangement concerning the first break or first extremum of records of the reference geophone. Wrongly loaded hodograph it is possible to delete, pressing Clear and to load other hodograph. The edited hodograph can be saved after pressing the button Save... In the existing table LBD such as FBINFO in the panel Save Calc. Hodograph or creating the new table (new entry). If before the beginning of work with the program the input hodograph was not prepared, it is necessary to set it by the mouse, passing in a mode Edit or Rule (Pencil) in the panel of icons.

  5. To establish a type of the corrective filter and to set input parameters. For this purpose it is necessary to press the button Shape correction in the main menu and further at one of buttons Wiener..., Predictive..., Spike... By pressing the button Wiener the mode Wiener corrective filtration will be established. By pressing buttons Predictive or Spike will are established modes predictive or spike deconvolution accordingly. In any mode the panel Processing Parameters opens. At the top of the panel the set input modifications for a depth sonde (Depth Sonde) and reference geophone (Reference Geophone) are displayed. The specified fields not edited. In fields Output for a depth sonde and reference geophone it is necessary to specify names of the appropriate output modification. For the definition of output modifications it is possible to use buttons Select. Then it is necessary to set input parameters. After the definition of all parameters and pressing of the button OK, they are written in a file of parameters JOBS / <project> /FRMCOR.par and by the following call of the program will be set by default. In a mode of the operator account in a window the position of a window rather hodograph is drawn by dark blue colour. Besides the button Run in frame Start processing opens. In a line of the information the message " Input parameters of FRMCOR was set is deduced! " The task is ready to start. If the position of a window concerning a hodograph is selected unoptimal, it is possible to change its parameters and again to press the button OK. The position of borders of the changed window will be drawn in a field of traces.
  6. After pressing the button Run the process of processing begins to be carried out. The course of carring of process shows the indicator of passage of the definition and in an information line the current quantity of the processed traces is deduced. After finishing of processing on the screen the traces of the reference geophone after the shape correction are drawn and the message " The shape correction was completed succesfully" is given out. The user at any moment can interrupt processing, pressing the button Stop.


Parameters of processing

The input parameters of the program are set in the panel Processing Parameters, which opens after pressing one of buttons Wiener..., Predictive..., Spike... The point of the main menu Shape correction.


If the file with parameters of the program earlier was not created, after opening the panel the message is deduced: JOBS / <project> /FRMCOR.par is not exist! Default parameters was set! JOBS / <project> /FRMCOR.par does not exist! The default settings were established! Here the project - name project. If the file with parameters exists, after opening the panel the parameters from this file (i.e. parameters which were used in last session with the program will be established).
At the top of the panel the information about open input modifications and hodograph is deduced, and also the output modifications should be set.

Depth Sonde: S *** S *** Select
The name of the set input modification (not edited field) is deduced from left to right, the name of output modification (itis necessary is to set) for traces of a depth sonde and Select - the button for activization of the panel of the putting of output modification with traces of a depth sonde.
Reference Geophone: S *** S *** Select
Are deduced the name of set input modification (unedited field) from the left to right, the output modification name (it is necessary to set) and Select - for for activization of the panel setting of output modification with reference geophone traces.
In fields Output for a depth sonde and reference geophone it is necessary to indicate names of the appropriate output modifications. It is possible also to set output modifications, pressing the appropriate button Select. Thus the dialogue panel of a kind opens:


in which it is possible to select output modification from the list Data modification or to set new modification in the bottom field of the panel, where the name of last output modification is by default given out, where the record was made. After pressing the button OK, the dialogue panel of the definition of output modification is closed, in a field Output Modification of the panel Processing Parameters the name of the given output modification is brought.

Input parameters:

Begin Depth Hcab, m
Initial depth Hcab, m
End Depth Hcab, m
Final depth Hcab, m
The parameters determine an interval of processing on depth in meters. In output modifications this interval is written by processed, and the traces outside of an interval of processing remain without change. By default interval of processing depths is established equal to an interval of the hodograph setting.
Reference Hcab of Reference Geophone (m)
The depth of a trace of the reference of the reference geophone in a mode Wiener, in modes Predictive and Spike is not set (is blocked). The reference trace is recommended to be selected in depths interval, where the steady behaviour of a pulse of the reference geophone is marked.
Left part of Window from Hodograph (ms)
The left part of a window from a hodograph, ms
Length of Window (ms)
Length of a window, ms.
The parameters define a position of a window of tune rather hodograph of the reference geophone for calculation of the return operator. It is recommended in a window of tune to include only those phases of a pulse, changing of which for different depths of the reference geophone is adequate to respective changins in traces of a depth sonde.
Length of operator (ms)
Length of the return operator in temporary area in modes Wiener and Predictive. In a mode Spike is not set (is blocked). It is recommended to set length of the operator a little bit less than length of a window of tune.
Regularization parameter
Regularization parameter of the return operator from 0 up to 1. The smaller is than parameter regularization, the more precisely correction, but is more probability of getting of unstable result.
Prediction interval (ms)
Interval of a prediction in a mode Predictive (ms). In modes Wiener and Spike this parameter is not set (is blocked). Parameter defines a part of a pulse after its introduction, which remains without essential changes, outside the capacity interval there is a suppression of "tail" of a pulse on a method of the least squares.

After the setting of all parameters and pressing of the button OK, their are written in a file of parameters JOBS / <project> /FRMCOR.par and by the following call of the program will be set by default. In a line of the information the message is deduced: Input parameters of FRMCOR was set! The input parameters FRMCOR were set! The position of a window rather hodograph is displayed in a field of traces by dark blue colour. Besides the button Run in frame Start processing opens. The setting is ready to start.


User interface

The main panel of the program Correction of excite pulse form consists of four frame (from above downwards):
The main menu,
Draw-area (field of visualization of traces),
Toolbar,
Line of the messages.


The main menu of the program

The main menu of the program looks like a line located from above of the main window of the program. The underlined letters can be used for the accelerated select of menu item with the help of the keyboard.

The main menu of the program after opening input modifications looks like:

The line of the menu consists of the following items:

File
Opening and visualization of input modification, closing of modification, exit from the program,
View
Visualization of open modification traces,
Hodograph
Work with hodographs: loading from LBD, saving in LBD, tune, clearing, interactive setting and editing,
Shape correction
Correction of the shape of record of the reference geophone and depth sonde traces,
Help
Call of the contextual hint or user's guides

Menu item File

The File item containes the vertical dropping out submenu items:

Project...
Opening of the input project
Open - > Depth Sonde...
Opening of input modification of depth sonde
Open - > Reference Geophone...
Opening of input modification with reference geophone traces
Close
Closing of input modification
Exit
Exit from the program.

Submenu item Project...

Is intended for the setting of the input project. After activization of this item the panel Project Selection opens:


The necessary project is selected. After pressing the button OK it is established.

Submenu item Open- > Depth Sonde...

This item is intended for opening modification with traces of a depth sonde. After pressing buttons Open- > Depth Sonde... There is a panel Project Selection, if the input project was not established earlier, and after the setting of the project the panel Depth sonde modification with the list of modifications opens. If the project was earlier established, the panel Depth sonde modification opens at once.


In it it is necessary to select by the cursor of the mouse input modification and to press the button OK. After visualization of modification with depth sonde traces the button Open- > Control Device will be unblocked...

Submenu item Open- > Control Device...

This point is intended for opening modification with traces of the reference geophone. After selection of input modification and pressing of the button OK in the panel Control data modification the input modification will be drawn in a field of traces.

Submenu item Close

After pressing the button Close... the modification imaged in a field of traces, is closed, the field of traces (Draw-area) is cleared. The input modification is recommended to be closed, when not that modification was wrongly loaded. In this case after pressing the button Close it can be loaded repeatedly.

Submenu item Exit

After pressing the button Exit the main panel of the program is closed, the work with the program comes to an end.

Menu item View

The View item contain vertical dropping out submenu items:

Undo
Cancellation of last variant of visualization in Draw-area and return to the previous variant,
Redo
Return to variant of visualization cancelled by last Undo,
Zoom in
Transition in a mode of the image increase
Zoom out
Transition in a mode of the image reduction
Info mode
Transition in a mode of the information getting about traces
Manual zoom...
Installation of scale of the image in a digital kind
Zoom all
Drawing of all modification in Draw-area
Installation of parameters of visualization

The details of work with the indicateded submenu items are possible are to see in the user's guide to the program " By(with) selection and Subtraction of waves (SUBCOR) ".

Menu item Hodograph

Item hodograph will be unblocked only after opening of modification with the reference geophone traces and contains vertical dropping out submenu items:

Load...
Loading of hodograph from data base table
Save...
saving of hodograph in the table LBD
Clear
Clearing of hodograph
Tune...
Tuning of position of a hodograph by its shift on time
Edit
Transition in a mode of editing of existing hodograph or setting of new hodograph by points

Submenu item Load

is intended for selection from the table VSP.FBLIST LBD and loading from the table such as FBINFO LBD of an input hodograph for the reference geophone modification. Input hodograph should has a type Cont Dev hodograph, but the hodograph and other type can be is loaded. Input hodograph has values of times for each cable depth in a column TFB, the values of times in nodes are written down in a column TZERO of the table of a type FBINFO. If hodograph is obtained as a result of correlation under the programs interactive selection and subtraction of waves VSP(SUBCOR), static correction calculation (STACAL) or synphase stacking (SINST), then in column KSIM of the table FBINFO coefficients of similarity of traces are contained, if it is saved a priori hodographs, in a column KSIM units are written down. If hodographs has a type of the first break (FB hodograph) or wave hodographs(Wave hodograph), it are obtained by the program Determination of the first break (FBD). In a column KSIM it contain a code NaNQ, which at loading such hodograph is replaced on 1.

After pressing the button Load... The panel Load Cont. Dev. hodograph with the list of hodographs from the list FBLIST opens.
After selection by the mouse of a required hodograph and pressing of the button OK hodograph imaged in a field of traces as vertical red hyphens (node points of hodograph), connected by green lines.


Submenu item Save...

Is intended for selection in the table VSP.FBLIST of a line with a hodograph name or new line for record of hodograph and saving of a hodograph in the appropriate table such as FBINFO. The button Save... Will be unblocked, if the hodograph is in the traces field. After pressing the button Save... The panel Save Hodographs opens, in which the line with of a hodograph name selectes by mouse or new entry, where hodograph will be saved.
After pressing the button OK in this panel there is a hodograph saving, which is taking place in a field of traces. The hodograph is given the Cont Dev hodograph type.

Submenu item Clear

The button Clear... Will be unblocked, if hodograph is in the traces field. After pressing the button Clear the hodograph field in memory is cleared and its image from the screen is erased.

Submenu item Tune...

The button Tune... Will be unblocked, if hodograph is in the traces field. Item Tune... Is intended for selection of an optimum position hodograph concerning characteristic points of a wave phase by shift. After pressing the button Tune... The panel Set Hodograph Shift opens,


containing parameter of hodograph shift Hodograph Shift, ms and buttons of actions:
Apply
The application of the set shift to a hodograph, the hodograph is moved together in a traces field,the shift meaning is added to all meaning of hodograph times. At positive value of shift the hodograph is moved together to the left, at negative - to the right.
Undo
Cancellation of last shift. Hodograph comes back to former times.
Close
The ending of hodograph tune, closing of the panel.
The selection of an optimum position of a hodograph for time should be carried out by the consecutive setting of shift and pressing of the button Apply. In a field of traces each time a new position of a hodograph is visualized. Selecting the hodograph position it is necessary to press the button Close.

Submenu item Edit

Is intended for editing the loaded hodograph or creation of a new hodograph in a field of traces. After its activization the mode of editing of a hodograph is established, in which a new node point of hodograph after the each pressing of the left key of the mouse in trace nearest to a point of Draw-area, indicated by the cursor, will be brought. Thus the old node on this trace is erased. Any node point of a hodograph can be removed by pressing of the right key of the mouse. The mode of editing is closed at transition in any other mode of operations with a traces field(for example Zoom in).

Menu item Shape Correction

The item Shape Correction is intended for correction of pulse shape of source by reference geophone traces contains the vertical dropping out submenu items:

Wiener...
Correction of pulse shape with usage of Wiener filter
Predictive...
Correction of the pulse shape with usage of the predictive deconvolution operator
Spike
Correction of the pulse shape with usage of the spike deconvolution operator
The item Shape corrections will be unblocked only after loading or hodograph setting in a field of reference geophone traces.

In all three ways of correction of the pulse shape, if the data of the depth device are registered by a multidot sonde, the operator calculated on the current trace of the reference geophone, is applied to all depth sonde trace s having the same logic number of magnetogram. In a case three-component data the corrective operator is calculated on Z-components of the reference geophone traces, and is applied to all components of traces of a depth sonde and reference geophone.

Submenu item Wiener

The item Wiener is intended for correction of pulse shape of a source by reduction of the record shape of the current trace of the reference geophone in the given temporary window to the record shape of a trace of the reference on the given depth on a method of the least squares (with the help Wiener filter). For an estimation of Wiener corrective operator at first auto correlation function of the current trace of the reference geophone in the window, given rather hodograph window and mutual correlation function of the current trace in the specified window and traces of the reference in a window, which position is defined by hodograph time on depth of the reference. Then the system of the equations Wiener-Hopf for optimum (in sense of the least squares) Wiener filter is solved, in which as a desirable output the pulse in a window on a trace of the reference is given. The calculated operator is applied to control and depth traces of the current depth. The pulse shape of shot point on the current trace of the reference geophone is resulted in the pulse shape on a reference trace. The change of the pulse shape of shot point caused by a deviation of the pulse shape of the current control trace from the pulse shape of the reference trace is excluded from a depth trace.

After pressing the button Wiener... The panel Processing Parameters, containing the information about used input modifications and hodograph, parameters of processing, progress - indicator of passage of process and button of actions opens. All these objects are described in the contextual help caused after pressing of the button Help in the given panel and in section 3.2. Parameters of processing of the given guide.

Submenu item Predictive

The item Predictive is intended for correction of pulse shape of a source by standardization way of the shape of the current reference geophone trace in the set temporary window by means of application of the operator of a predictive deconvolution. This mode is expedient for applying for standardization of a pulse and deconvolution of the sea data or at registration of the pulse shape under shot point, when the direct wave registers by reference geophone directly.

On the current control trace from the given interval of depths in tune window the minimal - phase (one-sided) operator of a errore of a prediction on the set interval Prediction interval is calculated. At application of such operator the duration of pulse is reduced before time of prediction interval. The calculated operator is applied to the current control and appropriate to it, VSP depth traces.

After pressing the button Predictive... The panel Processing Parameters, containing the information on used input modifications and hodograph, parameters of processing, progress - indicator of passage of process and button of actions opens. All these objects are described in the contextual help caused after pressing of the button Help in the given panel and in section 3.2. Parameters of processing of the given guide.

Submenu item Spike

The item Spike is intended for correction of the pulse shape of a source by standardization of the shape of the current the reference geophone trace in the set temporary window by means of application of the operator of a spike deconvolution. This mode is expedient for applying for standardization of a pulse and deconvolution of the sea data or at registration of pulse shape under shot point, when direct wave registers by reference geophone directly.

On the current control trace from the set depths interval in tune window in frequency area the zero - phase (two-sided) spike operator compressing the pulse in tune window of tune in two-sided spike placed on time of control records hodograph is calculated. The amplitude of a signal is saved constant. The calculated operator is applied to the current control and the appropriate to it VSP depth traces.

After pressing the button Spike... The panel Processing Parameters, containing the information on used input modifications and hodograph, parameters of processing, progress - indicator of passage of process and button of actions opens. All these objects are described in the contextual help caused after pressing of the button Help in the given panel and in section 3.2. Parameters of processing of the given guide.

Menu item Help

The item Help contain vertical dropping out submenu items:

Context Help...
Call of the contextual help
User Guide...
Call of the user's guide

INPUT DATA

Traces

In the program the input modifications with depth sonde and reference geophone traces are used. The type of depth sonde traces should be TYPE=D, type of the reference geophone traces TYPE=C. The depth sonde traces can be both one, and three-component, and to be registered both one-dot, and multidot sonde. The traces of the reference geophone can be both one, and three-component. In a case, when the depth sonde traces are obtained a multidot sonde, the depths of reference geophone traces correspond to the bottom points of a sonde.

Data base tables

Are used the table - list of hodographs VSP.FBLIST and table such as VSP... FBINFO, containing hodograph of the reference geophone having type Cont Dev hodograph. The input hodograph has values of times for each cable depth in a column TFB, the values of times in nodes are written down in a column TZERO of the table such as FBINFO. If hodograph is obtained as a result of correlation under the programs Interactive selection and subtraction of waves VSP (SUBCOR), Static corretions calculation (STACAL) or Synphase stacking (SINST), column KSIM of the table FBINFO contains coefficients of similarity of traces, if it is saved a priori hodographs, in a column KSIM units are written down.

OUTPUT DATA

Traces

In output modifications the depth sonde and reference geophone traces after correction of pulse shape are written. Structure of output modifications the same, as well as input modifications.

Report data

In a file FRMCOR.log in the catalogue LOG / <project> / the protocol of carring out of the program is written.

Other data

In a file FRMCOR.par in the catalogue JOBS / <project> / input parameters of the program are written.

REQUIREMENTS TO THE ENVIRONMENT

MESSAGES TO THE USER

Way of finishing of the messages up to the user

The information messages or messages about having place errors are deduced in a field of a line of the messages, or in a standard flow of a error of the program, if connections with X Windows Server not exit.

Description of the information messages

N/A

Description of the diagnostic messages

N/A

EXAMPLE OF USAGE

The application of procedure of correction of the pulse shape in a mode Wiener is shown on an example of a fragment of a structure Gr171_10. In figures the input traces of the reference geophone together with a hodograph and adjustment window are imaged


Depth sonde input traces


To these data the corrective filter with parameters was applied:


The results of application of the filter of the reference geophone traces are resulted

Contacts
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Phone:
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e-mail:
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