This section documents the seismic data types in SPW and the processes currently available for creating those data types.
Usage:
The AutoSeis Real Time Seismic Input step allows import AutoSeis seismic data format from the field into a single seismic file. Field data is imported automatically from a root directory. The output seismic files are by default set for nodes (receiver order).
Input Links:
None.
Output Links:
1) Seismic data in any sort order (mandatory).
References:
-
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
Input AutoSeis root directory: Specify AutoSeis root directory.
Input directory Browse for the directory where AutoSeis files are stored.
Remove auxiliary traces If checked, auxiliary traces present in the input data are automatically removed from the outuput seismic file.
Apply fractional time shift correction If checked apply factional time shift correction to the input data.
Usage:
The AutoSeis Seismic Input step allows import AutoSeis seismic data format from the field into a single seismic file. Field data is imported automatically from a root directory. The output seismic files are by default set for nodes (receiver order).
Input Links:
None.
Output Links:
1) Seismic data in any sort order (mandatory).
References:
-
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
Input AutoSeis root directory: Specify AutoSeis root directory.
Input directory Browse for the directory where AutoSeis files are stored.
Remove auxiliary traces If checked, auxiliary traces present in the input data are automatically removed from the outuput seismic file.
Apply fractional time shift correction If checked apply factional time shift correction to the input data.
Usage:
The Create Model Data step is a utility for testing purposes. It allows you to create synthetic data with specific number of events per record, the wavelet type, the number of records, the number of traces per record, the sample interval, the trace length, record and trace labeling parameters, and wavelet parameters for setting filtering frequencies.
Input Links:
None.
Output Links:
1) Seismic data in any sort order (mandatory).
References:
-
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
Number of events per record Enter the number of events per record to create.
Wavelet type Select the wavelet type to use.
General data parameters: Specify the general data parameters.
Number of records Enter the number of data records.
Sample interval (ms) Enter the sample interval of the traces in milliseconds.
Traces per record Enter the number of traces per record.
Trace length (ms) Enter the trace length in milliseconds.
Labelling parameters: Specify labelling parameters for field files and channels.
First field file number Enter the first field file number.
Field file increment Enter the field file increment number.
First channel number Enter the first channel number.
Channel number increment Enter the channel number increment.
Wavelet parameters: Specify wavelet parameters.
Lo-cut frequency (Hz) Enter the lo-cut filter frequency in Hertz.
Lo-pass frequency (Hz) Enter the lo-pass filter frequency in Hertz.
Hi-pass frequency (Hz) Enter the Hi-pass filter frequency in Hertz.
Hi-cut frequency (Hz) Enter the Hi-cut filter frequency in Hertz.
Usage:
The Frequency Cubes step computes frequency volumes from input seismic of SEG-Y files at specific frequencies. The output cubes are generated at specific frequencies inferred directly from the input seismic file or at user-defined frequencies. The output frequency volumes can also be sorted using user-defined sort order.
Input Links:
None.
Output Links:
1) Seismic data in selected processing sort order (mandatory).
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
Seismic file: Specify the location of the input seismic or SEG-Y file.
File Browse Select the input root file name. All the files sharing the same root name will be used as input.
SEGY format: Specify the input SEG-Y format.
Format Browse Select saved SEG-Y format. Browse for format file.
Create new SEGY format Select to create a new SEG-Y format.
View existing SEGY format Select to view current SEG-Y format.
SEGY index: Specify SEG-Y index parameters. If needed index file parameterization may be changed here.
Customize Index Map Select to customize the index map of the input SEG-Y file.
View trace headers Select to view the trace headers of the input SEG-Y file.
View trace header map Select to view trace header map of the input SEG-Y file.
Save headers to a file Select to save headers from input SEG-Y file into a file.
General dataset properties: Specify general properties of the input SEG-Y dataset. All these properties may be overwritten by the user. User-defined parameters will be used as parameter for the output seismic file.
Number of frequency cubes Enter number of frequency cubes to be generated.
Number of traces per cube Enter the number of traces per cube.
First output frequency Enter first output frequency.
Last output frequency Enter last ouput frequency.
Output frequency increment Enter output frequency increment.
Sample format Enter sample format.
Sample interval Enter sample interval in milliseconds.
Samples per trace Enter number of samples per trace.
Start time (ms) Enter start time of the input dataset in milliseconds.
End time (ms) Enter end time of the input dataset in milliseconds.
Processing sort order: Specify processing sort order. Ouput dataset will have selected sort order.
Primary sort key Select primary sort key to be used during processing.
Limit Range If checked, limit range based on primary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Secondary sort key Select secondary sort key to be used during processing.
Limit Range If checked, limit range based on secondary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Tertiary sort key Select tertiary sort key to be used during processing.
Limit Range If checked, limit range based on tertiary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Quaternary sort Select quaternary sort key to be used during processing.
Limit Range If checked, limit range based on quaternary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Create record at Select criteria to create record.
Usage:
The Frequency Gather step computes frequency gathers from input seismic of SEG-Y files at specific frequencies. The output cubes are generated at specific frequencies inferred directly from the input seismic file or at user-defined frequencies. The output frequency volumes can also be sorted using user-defined sort order.
Input Links:
None.
Output Links:
1) Seismic data in selected processing sort order (mandatory).
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
Seismic file: Specify the location of the input seismic file.
File Browse Select the input file name to be used in the analysis.
SEGY index: Specify SEG-Y index parameters. If needed index file parameterization may be changed here.
Rebuild index Select to rebuild the index file of the input seismic file.
Customize index map Select to customize the index map of the input seismic file.
View trace header Select to view trace headers.
Trace header ranges Select to update trace header ranges in Trace header ranges.
Trac header ranges: Specify the trace headers map into the index files and its ranges.
General dataset properties: Specify general properties of the input dataset. All these properties may be overwritten by the user. User-defined parameters will be used as parameter for the output seismic file.
Number of gathers Enter the number of gathers of input seismic file.
Freq. per gather Enter the number of frequencies per gather.
Number of traces Enter the number of traces of the input seismic file to be analyzed
Freq. increment Enter the frequency increment.
First output freq. Enter the first output frequency.
Last output freq. Enter the last output frequency
Sample format Enter the sample format of the input seismic file.
Sample interval Enter the sample interval of the input seismic file.
Samples/Trace Enter the number of samples per trace.
Input sort and selection option: Specify the input sort order.
Reset internal order Select to reset the sort order to the internal sort order of th input seismic file.
Primary sort key Select primary sort key to be used during processing.
Limit Range If checked, limit range based on primary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Secondary sort key Select secondary sort key to be used during processing.
Limit Range If checked, limit range based on secondary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Tertiary sort key Select tertiary sort key to be used during processing.
Limit Range If checked, limit range based on tertiary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Quaternary sort Select quaternary sort key to be used during processing.
Limit Range If checked, limit range based on quaternary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Create record at Select criteria to create record.
Regather groups into supergathers If checked, groups are regathers into supergathers.
Usage:
The Frequency Maps step computes frequency maps from input seismic of SEG-Y files at specific frequencies. The output cubes are generated at specific frequencies inferred directly from the input seismic file or at user-defined frequencies. The output frequency volumes can also be sorted using user-defined sort order.
Input Links:
None.
Output Links:
1) Seismic data in selected processing sort order (mandatory).
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
Seismic file: Specify the location of the input seismic or SEG-Y file.
File Browse Select the input root file name. All the files sharing the same root name will be used as input.
SEGY format: Specify the input SEG-Y format.
Format Browe Select saved SEG-Y format. Browse for format file.
Create new SEGY format Select to create a new SEG-Y format.
View existing SEGY format Select to view current SEG-Y format.
SEGY index: Specify SEG-Y index parameters. If needed index file parameterization may be changed here.
Customize Index Map Select to customize the index map of the input SEG-Y file.
View trace headers Select to view the trace headers of the input SEG-Y file.
View trace header map Select to view trace header map of the input SEG-Y file.
Save headers to a file Select to save headers from input SEG-Y file into a file.
General dataset properties: Specify general properties of the input SEG-Y dataset. All these properties may be overwritten by the user. User-defined parameters will be used as parameter for the output seismic file.
Sample format Enter sample format.
Sample interval Enter sample interval in milliseconds.
Samples per trace Enter number of samples per trace.
Number of times Enter the number of times where the analysis is going to be performed.
Number of traces per map Enter the number of traces per map.
Number of frequency cubes Enter number of frequency cubes to be generated.
First output frequency Enter first output frequency.
Last output frequency Enter last ouput frequency.
Processing sort order: Specify processing sort order. Ouput dataset will have selected sort order.
Primary sort key Select primary sort key to be used during processing.
Limit Range If checked, limit range based on primary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Secondary sort key Select secondary sort key to be used during processing.
Limit Range If checked, limit range based on secondary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Tertiary sort key Select tertiary sort key to be used during processing.
Limit Range If checked, limit range based on tertiary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Quaternary sort Select quaternary sort key to be used during processing.
Limit Range If checked, limit range based on quaternary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Create record at Select criteria to create record.
Usage:
Input Links:
None.
Output Links:
1) Seismic data in any sort order (mandatory).
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
Input source: Specify either the input seismic is all the files at a given directory or at a a specific file within the directory
Specify input directory If selected, input data is defined as all the seismic files in the Input directory. Files will be loaded sequentially as defined in File ordering.
Specify input virtual tape device Not yet implemented.
Specify starting input file If selected, input data is defined starting from a user-defined seismic file. Files will be loaded sequentially as defined in File ordering.
Input directory Browse for input directory where seismic files are stored.
File ordering: Specify the sequential order used to load the seismic files.
Order files by timestamp If selected, seismic files will be loaded by its timestamp, from older to newer.
Order files by name If selected, seismic files wil be loaded by alphabetically by its name.
Sum common shots on input If checked, records with the same FFID will be summed together during the input.
Timing delay: Specify time delay of the input.
Delay processing of new records during real-time input If checked, a dealy will be added to the input of new records.
Check time sync Select to check time sync between acquisition and data input.
Length of time delay for each new file Enter the delay time in seconds.
Data format Enter the input data format from a set of standard data formats.
Remove auxiliary traces If checked, traces flagged as auxiliary will be removed during the input.
Usage:
The SEG2 Import step allows for direct input of SEG-2 formatted data from a disk file.
Input Links:
None. The SEG-2 disk file is selected in the SEG2 File dialog by means of a Browse button.
Output Links:
1) Seismic data file (mandatory).
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
Input directory: Specify input paramters.
Browse Select the SEG-2 disk file and set the input parameters. Click on the Browse button to select the SEG-2 disk file. Once the file has been selected, the values in the SEG-2 trace header indicating the number of records, the number of traces per record, the sample interval, and the number of samples per trace will be displayed in the SEG-2 File dialog. Be sure to confirm the verity of these values. If they are not as expected, an option exists to override these values so that the SEG-2 file may be successfully reformatted.
Dataset properties: Specify parameters related with the input SEG-2 file.
Number of records Enter the number of records in the SEG-2 disk file inferred from the SEG-2 file header.
Number of channels Enter the number of traces per record stored in bytes 6 and 7 of the SEG-2 file descriptor block.
Override If checked, enter a value to overwrite the number of traces per record stored in the input file.
Number of samples Indicates the number of samples per trace stored in bytes 8-11 of the SEG-2 trace descriptor block.
Override If checked, enter a value to overwrite the number of samples per trace stored in the input file.
Sample interval (ms) Indicates the sample interval stored in the appropriate sub-string of the SEG-2 file descriptor block.
Override If checked, enter a value to overwrite the sample interval in milliseconds stored in the input file.
Ignore trace data blocks size in trace descriptor block If checked, ignore trace data blocks size as defined in trace descriptor block.
Usage:
The SEGD Import step allows for direct input of SEG-D formatted data from a disk file. Different standard SEG-D formats are available for import.
Input Links:
None. The SEG-2 disk file is selected in the SEG2 File dialog by means of a Browse button.
Output Links:
1) Seismic data file (mandatory).
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
SED Format Select the SEG-D format available for data import. Available formats are Serce 408 / 428 / 508, Hydrosience NTRS S1, Geometrics, Farfield Nodal, Hydrosience NTRS SEGD, GeoRes SEGD, INOVA G3i.
Browse Select the SEG-D disk file and set the input parameters. Click on the Browse button to select the SEG-D disk file. Once the file has been selected, the values stored in the SEG-D trace header indicating the number of records, channel stes, data channels, auxiliary channels, record length, number of samples, sample interval, SEG format code, SEG revision are displayed in the Dataset properties box.
Usage:
The SEG Y Export allows for direct output of seismic files into a formatted data SEG-Y.
Input Links:
1) Seismic data file (mandatory).
Output Links:
None.
Example Flowchart
Step Parameter Dialog:
Parameter Description:
Seismic file: Specify the location and name for the output seismic file.
File Browse Browse for the output directory and define output file name.
SEGY format: Specify the input SEG-Y format.
SEGY Format Browse Select saved SEG-Y format. Browse for format file.
Create new SEGY format Select to create a new SEG-Y format.
View existing SEGY format Select to view current SEG-Y format.
General dataset properties: Specify general properties of the input dataset. All these properties may be overwritten by the user. User-defined parameters will be used as parameter for the output seismic file.
Number of records Enter the number of records in the input seismic file.
Traces per record Enter the number of traces per record.
Number of traces Enter the number of traces in the input seismic file.
Samples per trace Enter the number of samples per trace in the input seismic file.
Sample interval Enter the sample interval of the input seismic file in milliseconds
Sample format Enter the sample format of the input seismic file.
Data dimesion: Specify the dimension of the input data.
2D survey If selected, input data is two-dimensional.
3D survey If selected, input data is three-dimensional.
Output options: Specify options of the output SEG-Y file.
Create index file If checked, create index file for output SEG-Y file.
Remove dead traces If checked, traces flagged as dead are removed from the outpu SEG-Y file.
Keep dead traces If checked, traces flagged as dead are not removed from the outpu SEG-Y file.
Usage:
The SEG Y Field Export step allows for direct output of SEG Y formatted data from specific trace header fields of an input seismic file. It exports seismic files as field SEG-Y data
Input Links:
1) Seismic data file (mandatory).
Output Links:
None.
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
Browse Browse for the directory where the output SEG-Y files will be stored.
File naming: Specify common file name for the output seismic files.
Create file name using receiver identifier of first trace in gather If selected, file name of the output SEG-Y files uses the receiver number of the first trace in the gather as identified.
Create file name using field file number of first trace in gather If selected, file name of the output SEG-Y files uses the field file number of the first trace in the gather as identified.
Create file name using frequency of first trace in gather If selected, file name of the output SEG-Y files uses the frequency number of the first trace in the gather as identified.
Create file name using data timestamp Not yet implemented.
File name prefix Enter the file name prefix of the output SEG-Y files that will be written in the hard-drive.
SEG-Y Format: Specify SEG-Y format of the output SEG- files.
Browse Browse for an existing SEG-Y format file.
Create new SEGY format Select to create a new SEG-Y format.
View existing SEGY format Select to view current SEG-Y format.
Usage:
The SEGY Filed Import step allows importing field SEG Y formatted data from a disk file into a seismic file.
Input Links:
None.
Output Links:
1) Seismic data file (mandatory).
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
SEGY file: Specify either the input seismic is all the files at a given directory or at a a specific file within the directory
Select input directory If selected, all files in directory will be imported sequentially in alphabetic order.
Select starting input file If selected, input data is defined starting from a user-defined seismic file sequentially in alphabetic order.
Directory browse Browse for input directory where seismic files are stored.
SEG-Y Format: Specify SEG-Y format of the output SEG- files.
Browse Browse for an existing SEG-Y format file.
SEGY analyzer Select to access properties of the input SEG-Y file.
Create new SEGY format Select to create a new SEG-Y format.
View existing SEGY format Select to view current SEG-Y format.
General dataset properties: Specify general properties of the input dataset. All these properties may be overwritten by the user. User-defined parameters will be used as parameter for the output seismic file.
Number of records Enter the number of records in the input seismic file.
Traces per record Enter the number of traces per record.
Number of traces Enter the number of traces in the input seismic file.
Samples per trace Enter the number of samples per trace in the input seismic file.
Sample interval Enter the sample interval of the input seismic file in milliseconds
Sample format Enter the sample format of the input seismic file.
Sample format Enter the record length of the input SEG-Y file in milliseconds.
Set field file number from input file name If checked, field file number is retrieved fom the name of the input file name.
Set line number from EBCDIC header (C 3 LINE) If checked, line number is retrived from the SEG-Y text header (EBCDIC header) at line position C3.
Usage:
The SEGY Import step allows for direct input of SEG Y formatted seimsic data from a disk file into a seismic file in SPW format. It allows to select the SEG-Y trace header keys to be mapped into the index file which stores this information as part of the SPW format.
Input Links:
None.
Output Links:
1) Seismic data file (mandatory).
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
SEGY File: Specify input SEG-Y file by browsing it.
Browse Browse for the input SEG-Y file.
SEG-Y Format: Specify the input SEG-file format Y format and map trace headers to be stored in the SPW index file.
Browse Browse for an existing SEG-Y format file.
SEGY analyzer Select to access properties of the input SEG-Y file.
Create new format Select to creat a new SEG-Y map format.
View existing format Select to view the existing format, SEGY index fields are automatically updated.
SEGY index fields Check/Uncheck SEG-Y trace headers to be mapped into the SPW index file.
SEGY index: Specify SEG-Y index parameters. If needed index file parameterization may be changed here.
Build SEGY index Select to build the index filel usinf the current SEG-Y format for the selected input SEG-Y file.
View trace headers Select to view original trace headers from the input SEG-Y file.
Trace header ranges Select to update Trace header ranges table
Trace header ranges Shows the range of the input SEG-Y trace headers
General dataset properties: Specify general properties of the input dataset. All these properties may be overwritten by the user. User-defined parameters will be used as parameter for the output seismic file.
Number of records Enter the number of records in the input seismic file.
Traces per record Enter the number of traces per record.
Number of traces Enter the number of traces in the input seismic file.
Samples per trace Enter the number of samples per trace in the input seismic file.
Sample interval Enter the sample interval of the input seismic file in milliseconds
Sample format Enter the sample format of the input seismic file.
Dimesion: Specify the dimension of the input data.
2D survey If selected, input data is two-dimensional.
3D survey If selected, input data is three-dimensional
Input sort and selection option: Specify the input sort order.
Reset internal order Select to reset the sort order to the internal sort order of th input seismic file.
Primary sort key Select primary sort key to be used during processing.
Limit Range If checked, limit range based on primary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Secondary sort key Select secondary sort key to be used during processing.
Limit Range If checked, limit range based on secondary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Tertiary sort key Select tertiary sort key to be used during processing.
Limit Range If checked, limit range based on tertiary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Quaternary sort Select quaternary sort key to be used during processing.
Limit Range If checked, limit range based on quaternary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Create record at Select criteria to create record.
Regather groups into supergathers If checked, groups are regathers into supergathers.
Usage:
The Seismic File step allows you to select or create a SPW format seismic file on disk. It is the input SPW seismic format file and/or the output SPW seismic format file for almost all the processing steps.
Input Links:
The Seismic File may receive input links from any processing step that requires an output seismic data file. In this case, execution of the flow will require that the user provides a file name for the Seismic File by left-clicking on the icon to open the Seismic File dialog and creating the output file name with the Browse button.
Output Links:
Output links from the Seismic File may be directed to any processing step that requires as input a seismic data file. In this case, execution of the flow will require that the user provides a file name for the Seismic File by left-clicking on the icon to open the Seismic File dialog and selecting the input file name with the Browse button.
Example Flowchart:
Step Parameter Dialog:
Seismic file: Specify location and name of the seismic file. Browse for existing file if seismic file is going to be used as input for other processing step or write select directory and write file name if seismic file is going to be used as output fo a processing step.
File Browse Select to browse for input or output location and select file.
SEGY index: Specify parameters related with the index file used as part of the SPW seismic formatl.
Rebuild index Select to rebuild index file. Due to SPW updates there may be the need to update an existing index file.
Customize Index Map Select to customize the index file. With this option the user can select which fields are stored in the index file.
View trace headers Select to view trace header values with its ranges.
Trace header ranges Select to open a table with the ranges for all the trace header in the seismic file.
General dataset properties: Specify general properties of the input dataset. All these properties may be overwritten by the user. User-defined parameters will be used as parameter for the output seismic file.
Number of records Enter the number of records in the input seismic file.
Traces per record Enter the number of traces per record.
Number of traces Enter the number of traces in the input seismic file.
Samples per trace Enter the number of samples per trace in the input seismic file.
Sample interval Enter the sample interval of the input seismic file in milliseconds
Sample format Enter the sample format of the input seismic file.
Dimesion: Specify the dimension of the input data.
2D survey If selected, input data is two-dimensional.
3D survey If selected, input data is three-dimensional
Input sort and selection option: Specify the input sort order.
R Select to sort the seismic file by common receiver order: Primary sort key is set to none; Secondary sort key is set to none; Tertiary sort key is set to Offset; Quaternary sort key is set to none; Create record at is set to Change in secondary.
O Select to sort the seismic file by common offset order: Primary sort key is set to Offset; Secondary sort key is set to none; Tertiary sort key is set to none; Quaternary sort key is set to none; Create record at is set to Change in primary.
C Select to sort the seismic file by common midpoint order: Primary sort key is set to Offset; Secondary sort key is set to none; Tertiary sort key is set to none; Quaternary sort key is set to none; Create record at is set to Change in primary.
S Select to sort the seismic file by common source order: Primary sort key is set to FFID; Secondary sort key is set to Channel; Tertiary sort key is set to none; Quaternary sort key is set to none; Create record at is set to Change in primary.
Reset internal order Select to reset the sort order to the internal sort order of th input seismic file.
Primary sort key Select primary sort key to be used during processing.
Limit Range If checked, limit range based on primary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Secondary sort key Select secondary sort key to be used during processing.
Limit Range If checked, limit range based on secondary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Tertiary sort key Select tertiary sort key to be used during processing.
Limit Range If checked, limit range based on tertiary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Quaternary sort Select quaternary sort key to be used during processing.
Limit Range If checked, limit range based on quaternary sort key.
Minimum value Enter minimum value to limit the range
Maximum value Enter the maximum value to limit the range.
Create record at Select criteria to create record.
Regather groups into supergathers If checked, groups are regathers into supergathers.
Output options: Specfify options related with the output seismic file.
Append to exsiting dataset If checked, current input file will be appended to existing file as defined in Seismic file.
Do not overwrite and exisiting output file If checked, if the output file already exists this will not be overwritten. Instead a new name will be automatically given to the output file.
Export full input header If checked, the full trace header information will be exported along with the seismic data.
Remove dead traces If checked, traces from the input file flagged as dead will be removed and not written in the output seismic file.
Keep dead traces If checked, traces from the input file flagged as dead will not be removed and will be written in the output seismic file.
Do not write data into file If checked, no data wil be written in the output file, only information related with the trace headers will be written.
Do not output index file If checked, the index file will not be written.
Usage:
The Select Traces step allows selecting a user-defined range of traces from the input seismic file. The selection of traces if defined based on the ranges of primary, secondary and tertiary sort keys.
Input Links:
1) Seismic file in any sort order (mandatory).
Output Links:
1) Seismic file in any sort order (mandatory).
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
Import Select to import a Trace Select auxiliary card data file to be used as selection of traces from input seismic file.
Export Select to export into a Trace Select auxiliary card data file the list of traces selected by the table above.
Add Row Select to add a row to the list of selected traces.
Primary header Select the primary header key to be used for the trace selection as defined in the Primary start and Primary Stop.
Primary start Enter the primary header key start value.
Primary stop Enter the primary header key end value.
Secondary header Select the secondary header key to be used for the trace selection as defined in the Secondary start and Secondary Stop.
Secondary start Enter the secondary header key start value.
Secondary stop Enter the secondary header key end value.
Tertiary header Select the tertiary header key to be used for the trace selection as defined in the Tertiary start and Tertiary Stop.
Tertiary start Enter the tertiary header key start value.
Tertiary stop Enter the tertiary header key end value.
Delete Row Select to delete last row of the list of selected traces.
Usage:
The TCPIP Data input step allows creating a SPW seismic file directly from the field through a TCP/IP protocol. Data received directly from the acquisition system and transmitted using the TCP/IP is then written as a seismic file along with its index file. Currently this processing allows receiving data from Silixa and Georesources systems.
Input Links:
None
Output Links:
1) Seismic data in any sort order (mandatory). This seismic file will be sorted as the field data.
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
TCP/IP address Enter TCP/IP address where the acquired data will be transmitted.
Input from Georesources system If selected, input data is from a Georesource system.
Georesources parameters: Specify input parameters regarding input data.
Overwrite dataset parameters If checked, overwrite data acquisition parameters.
Sample format Enter sample format of the input data.
Number of Samples Enter number of samples of input data.
Keep recording when skipped shots If checked, output seismic file will have skipped shots.
Sample interval (ms) Enter sample interval in milliseconds.
Number of Channels Enter number of channels of input data.
Number of Aux. Channels Enter number of auxiliary channels.
Continuous recording If checked, the TCP/IP stop signal will be ignored and the record will continue.
Incremental index start at Enter the start value for the incremental index of each record.
Dimiss Aux Channels If checked, auxiliary traces are not store in output seismic file.
Connection timeout (ms) Enter a time value in milliseconds for the connection to be considered timedout.
Data read delay (ms) Enter a delay value in milliseconds for the data to be read.
Number of shots to skip Enter the number of shots to skip during the recording.
Upper limit Enter the
Lower limit
Average water layer velocity Enter a value im meters per second of the average water velocity. This value will be used to automatically pick the first arrivals.
First arrivals window size Enter the window size in milliseconds for the first arrival picking.
Output ASCII log If checked, as ASCII log with the acquisition report will be generated.
Input from Silixa system If selected, input data is from a Silixa system.
Silixa parameters: Specify Silixa real time acquisition parameters.
Apply surface geometry If checked, applies in real time the surface geometry to the data.
Geometry parameters Select to define the parameters related with the acquisition geometry.
Apply VSP geometry If checked, apply VSP geometry to the data acquired in real time.
Output SEGY files containing geometry If selected, outputs SEG-Y files with geometry applied.
Output directory Select to browse for the output directory of SEG-Y with geometry
Perform vibroseis correlation If checked, performs real-time vibroseis correlation of the acquired data.
Vib parameters Select vibroseis related parameters.
Output correlated SEGY files If checked, outputs vibroseis correlated SEG-Y files.
Output directory Select to browse for the output directory of vibroseis correlated SEG-Y files
Sum common shot records If checked, sum common shot records in real-time.
Summing paramters Select to define the parameters related with the real-time summing.
Usage:
The Update SEGY Textheader step adds a EBCIDIC text header into a SEG-Y seismic file. The text header needs to be stored in an auxiliary text file.
Input Links:
1) Seismic data file in any sort order (mandatory).
Output Links:
1) Seismic data in any sort order (mandatory).
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
File Browse Browse for the location of the text file with the EBCDIC header to be included in the seismic file.
Usage:
The Virtual Tape Input step allows importing seismic data from tapes into a seismic file. In order to access this step a tape drive must be connected using a SCSI connection.
Input Links:
None.
Output Links:
1) Seismic file in any sort order (mandatory).
Example Flowchart:
Step Parameter Dialog:
Parameter Description:
Input Source: Specify the virtual tape device.
Virtual tape device Browse for the virtual tape device.
Crtl Select to test control parameters of the virtual tape.
Archive Files: Specify archive location.
Browse Browse for archive location.
Wait Delay: Specify delay during reading.