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input_general

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input_general

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     Input General (INPUT_GENERAL)

     Abstract

     Seismic data traces and the corresponding trace headers are input from one of the supported seismic file formats or from a data set group. The input traces may be truncated to a specified minimum and maximum reflection time. Gathers can also be selected from the input data by using the gather number or by using a sort literal range.

     NOTICE Copyright protection as an unpublished work is claimed by WesternGeco. The work was created in 2008. Should publication of the work occur, the following notice shall apply. " 2008 Westerngeco". This work contains valuable tradesecrets; disclosure without written authorization is prohibited.

     November 2008 - WesternGeco

     INPUT_GENERAL

     1

     Input General

     Contents

     1.0 Technical Discussion 1.1 1.2 Introduction Input Options 1.2.1 Input File Information 1.2.2 Specification by File Name 1.2.3 Specification by File Tag 1.2.4 Specification by Dataset Group 1.3 1.4 Specifying Sample Range in Time Gather Selection Options 1.4.1 Gather Sort Literal Range Selection 1.4.2 Gather Number Selection 1.5 2.0 Random Access Keys

     Inputs and Outputs 2.1 Outputs

     3.0 4.0 5.0

     Literal Summary Parameter Set Summary Setup Parameters 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 Specify by File Name Dataset Group Information General Limit Gathers Input Limit Gathers Output Merge Traces File Tag Information Copy Input Data Random Access

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     INPUT_GENERAL

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     Input General

     1.0 Technical Discussion

     1.0 Technical Discussion

     1.1 Introduction

     The Input General Seismic Function Module (SFM) inputs seismic data traces and the corresponding trace headers from one or more files in one of the supported formats: Seismic Structured File (SFAM) or Seismic Disk Input/Output (DIO). DIO files may be indexed, in which case random

    access of the data is possible. Data can also be input from a dataset group containing one or more data files of the allowable file types. The input traces may be truncated to a specified minimum and maximum reflection time. Selection of gathers to process is achieved by using actual gather numbers, or by using a sort literal range.

     1.2 Input Options

     1.2.1 Input File Information

     There are three methods of specifying files to be read by Input General: File Name, File Tag, and Dataset Group. When specifying by File Name or File Tag, any number of input files may be specified using a table. When specifying by Dataset Group, a single dataset group, typically containing multiple files, is read. Regardless of the method, all disk files to be read must share the same values for SAMP_INT, EARLIEST_TIME, and SORT_LITERAL in the trace descriptor.

     1.2.2 Specification by File Name

     Files are specified by name on the Input File Information parameter set. This parameter set contains a table for specification of multiple files. The files are either concatenated or merged, depending on whether the Merge Traces parameter set exists in the setup. Files specified by file name can be accessed remotely by using the rtf URL encoding, as follows: rtf://hostname/disk_path where hostname is the name of the remote host on which the file resides, and disk_path is the fully qualified file name. The specified remote host must have the OmegaLauncher service running to support remote file access.

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     Input General

     1.0 Technical Discussion

     1.2.3 Specification by File Tag

     Files are specified by tag on the File Tag Information parameter set. This parameter set contains a table for specification of multiple files. The tag files are either concatenated or merged, depending on whether the Merge Traces parameter set exists in the setup. An active OPM database connection is required to use file tags.

     1.2.4 Specification by Dataset Group

     Dataset groups are specified on the Dataset Group Input parameter set. A dataset group is a logical grouping of files that exists in the OPM Database. The files in the dataset group are either concatenated or merged, depending on whether the Merge Traces parameter set exists in the setup. Dataset groups are created using the Output General SFM. An active OPM database connection is required to use dataset groups.

     1.3 Specifying Sample Range in Time

     The General parameter set can be used to specify the beginning time

    and ending time of the seismic traces to be input. The numerical value that you specify has units of milliseconds. The end time must be greater than the beginning time.

     1.4 Gather Selection Options

     1.4.1 Gather Sort Literal Range Selection

     In the Input General SFM you can select gathers based on a sort literal range. You can specify ranges for the primary, secondary, and tertiary sort literal. Then you will only read in gathers that fall into these ranges. This is useful when you want to split a dataset into multiple parts based on sorting information.

     1.4.2 Gather Number Selection

     Alternatively, you can select the gathers to input using the gather number in the file. You can select the starting gather (gather number 1), the number to process, the process increment, and the number of consecutive gathers to process. In addition, you can select additional gathers to input by using the table. These are not included in the total specified by the number of gathers parameter. An example of this would be if you wanted to start at the second gather, you wanted to process five, with an increment of four and two consecutive. You would end up with gathers: 2, 3, 6, 7, 11. Any specific gathers specified in the table are included in addition to these.

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     Input General

     1.0 Technical Discussion

     1.5 Random Access Keys

     When the input file is an indexed DIO file, random access keys can be used to set the order in which traces are retrieved from the file. Random access keys can also be used to delimit which disk records are retrieved. In order to use the Random Access parameter set in this SFM, the input file must have been created with the Output General (OUTPUT_GENERAL) SFM using the Random Access Keys parameter set to define the random access literals. If no random access keys are specified at file creation, the sort literals of the input file are the only available random access keys. The access keys that were stored with the file when it is created dictate the ability of Input General to retrieve the traces randomly. If the Random Access parameter set is not present in the setup, the input file is read sequentially (that is, the first trace written to disk is the first trace read). This method may give the user unexpected results if data has been replaced or appended to the original random access file. The Random Access parameter set is composed of primary, secondary and tertiary key information. For each key, the user specifies the trace header literal with which

    to access the files. This trace header literal must have been specified as a random access key when the file was created. To specify a range of primary, secondary and tertiary key values to retrieve, the Limit Gathers Input parameter set may be used. The secondary and tertiary key information is optional, and is meaningless if multiple keys were not requested when the file was created. If the secondary and tertiary keys are appropriate, Input General cycles through the complete range of secondary and tertiary keys before advancing to the next primary key value. If secondary or tertiary keys are not provided, all records with the matching primary key value are retrieved in the order that the records are stored. The following examples show different setups for the Random Access, Limit Gathers Input, and Limit Gathers Output parameter sets, depending on user requirements.

     Example 1

     A user wants to access CMPs 500 to 1000 of a stacked data set. Because each trace has a unique CMP, the following setup would work, provided that the CMP was stored as a single key when the file was created:

     *RANDOM_ACCESS PRIM_ACCESS_KEY = CMP SECN_ACCESS_KEY = NOT_USED TERT_ACCESS_KEY = NOT_USED *LIMIT_GATHERS_INPUT PRIM_START = 500 PRIM_END = 1000

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     Input General

     1.0 Technical Discussion

     Example 2

     A user wants to QC every 10th in-line between 1 and 100 of a 3-D stacked data set. If 3DT_PRIM_INDEX was stored as a single key when the file was created, the following setup can be used:

     *RANDOM_ACCESS PRIM_LIT = 3DT_SEC_INDEX SECN_LIT = NOT_USED TERT_LIT = NOT_USED *LIMIT_GATHERS_INPUT PRIM_START = 1 PRIM_END = 100 *LIMIT_GATHERS_OUTPUT PROCESS_INCREMENT = 10

     Example 3

     If 3DT_SEC_INDEX and 3DT_PRIM_INDEX were stored as a double key when the data from Example 2 was created, the following setup would be used to provide every 10th in-line trace:

     *RANDOM_ACCESS PRIM_LIT = 3DT_SEC_INDEX SECN_LIT = 3DT_PRIM_INDEX TERT_LIT = NOT_USED *LIMIT_GATHERS_INPUT PRIM_START = 1 PRIM_END = 100 SECN_START = 1 SECN_END = 500 *LIMIT_GATHERS_OUTPUT PROCESS_INCREMENT = 10

     Example 4

     Using the same input file as in Example 3, where an additional index of 3DT_PRIM_INDEX and 3DT_SEC_INDEX are stored as a double key. If the user wants to QC every 50th crossline, the following setup can be used:

     *RANDOM_ACCESS PRIM_LIT = 3DT_PRIM_INDEX SECN_LIT = 3DT_SEC_INDEX TERT_LIT = NOT_USED *LIMIT_GATHERS_INPUT PRIM_START = 1 PRIM_END = 500 SECN_START = 1 SECN_END = 100

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     Input General

     *LIMIT_GATHERS_OUTPUT PROCESS_INCREMENT = 50

     1.0 Technical Discussion

     Example 5

     Use the same input file as in Example 3 and Example 4, where 3DT_PRIM_INDEX and 3DT_SEC_INDEX were stored as a double key. If the user wants the data presented as if a crossline sort has been performed, the following setup can be used:

     *RANDOM_ACCESS PRIM_LIT = 3DT_PRIM_INDEX SECN_LIT = 3DT_SEC_INDEX TERT_LIT = NOT_USED *LIMIT_GATHERS_INPUT PRIM_START = 1 PRIM_END = 500 SECN_START = 1 SECN_END = 100

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     Input General

     2.0 Inputs and Outputs

     2.0 Inputs and Outputs

     2.1 Outputs

     Standard Output (Required) Standard output port STANDARD_OUTPUT

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     Input General

     3.0 Literal Summary

     3.0 Literal Summary

     Identification Header

     LITERAL EARLIEST_TIME FIRST_SORT_VALUE DESCRIPTION ACCESSED UPDATED X X X

     MAX_REFLECT_TIME SAMP_INT SORT_DIRECTION

     SORT_LITERAL

     SORT_VALUE_ABS

     SORT_TOLERANCE

     SORT_VAL_INC

     Earliest TIME_SHIFT_ALIGNMENT First Sort Value (Deleted with parameter set MERGE_TRACES) Maximum Reflection Time Sampling Interval Sort Direction (Accessed/updated with parameter set MERGE_TRACES) Sort Literal (Accessed/updated with parameter set MERGE_TRACES) Sort Value Absolute (Accessed/updated with parameter set MERGE_TRACES) Tolerance

    Limit (Deleted with parameter set MERGE_TRACES) Sort Value Increment (Deleted with parameter set MERGE_TRACES)

     X X X

     X X

     X

     X

     X

     X

     X

     X

     Trace Header

     LITERAL DESCRIPTION_SECT_PTR TI.DATASET_SEQ_NUM DESCRIPTION Random Integer Value Generated for Each Dataset When Concatenated Datasets Are Input Sequential Integer Value Generated for Each Dataset When Concatenated Datasets Are Input. Useful When Re-splitting Data with OUTPUT_GENERAL option TRC_SELECT and Using this Literal as the Key.

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     Input General

     4.0 Parameter Set Summary

     4.0 Parameter Set Summary

     Parameter Set Name Geophysical Language INPUT_FILE_INFO SD_FILE_NAME FD_FILE_NAME TABLE FILE_NAME INPUT_DATASET_GROUP SD_DATASET_GROUP FD_DATASET_GROUP INPUT_GROUP_TABLE

    DATASET_GROUP_NAME LIMIT_INPUT_TABLE LITERAL START END GENERAL BEGINNING_TIME ENDING_TIME IDH_OVERRIDE LIMIT_GATHERS_INPUT PRIM_START PRIM_END SECN_START SECN_END TERT_START TERT_END LIMIT_GATHERS_OUTPUT STRT_GATHER NUMBER_TO_PROCESS PROCESS_INCREMENT CONSECUTIVE_GATHERS TABLE GATHERS MERGE_TRACES GATHER_DIM TABLE MERGE_LIT November 2008 - WesternGeco Parameter Set Title Parameter Title Specify by File Name Successful Step Table File Disposition Failed Step Table File Disposition Table of Input Files Input File Name Dataset Group Information Successful Step Group Disposition Failed Step Group Disposition Input Dataset Groups Group Name Limit Datasets Input by Summary Literals Literal Name Literal Start Literal End General Beginning Time of Seismic Trace Ending Time of Seismic Trace Identification Header Override Limit Gathers Input Primary sort literal start Primary sort literal end Secondary sort literal start Secondary sort literal end Tertiary sort literal start Tertiary sort literal end Limit Gathers Output Starting Gather Number of Gathers to Process Gather Processing Increment Consecutive Gathers Extra Gathers Table of Gathers to Process Merge Traces Gather Dimension Table Merge Literals Status

Optional

     Optional

     Required

     Optional

     Optional

     Optional

     INPUT_GENERAL

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     Input General Parameter Set Name Geophysical Language MERGE_DIR MERGE_VAL_ABS INPUT_TAG_INFO SD_TAG_NAME FD_TAG_NAME TABLE PUNIT TAG_NAME COPY_INPUT SD_TAG_NAME FD_TAG_NAME COPY_SITE COPY_POOL COPY_FILE_DISP RANDOM_ACCESS GATHER_DIM TABLE RANDOM_ACCESS_LIT Parameter Set Title Parameter Title Merge Direction Merge Value Absolute

     4.0 Parameter Set Summary Status

     File Tag Information Successful Step Table Tag Disposition Failed Step Table Tag Disposition Input Data Table Input Data Punit File Tag Name Copy Input Data Successful Step Copy Tag Disposition Failed Step Copy Tag Disposition Copy Site for Input Data Transfer Copy Pool for Input Data Transfer Copy File Disposition for Input Data Transfer Random Access Gather Dimension Table Random Access Literals

     Required

     Optional

     Optional

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     Input General

     5.0 Setup Parameters

     5.0 Setup Parameters

     5.1 Specify by File Name

     General Information

     This parameter set is used when specifying file names for the input data. Multiple files may be specified. The files are either concatenated or merged, depending on whether the Merge Traces parameter set is specified.

     INPUT_FILE_INFO

     (Status: Optional, Type: standard)

     PARAMETERS:

     SD_FILE_NAME Successful Step Table File Disposition This parameter specifies whether the table files are kept or deleted when the processing step completes successfully. If deleted, the files are removed at the end of the step and cannot be accessed by the next step. Only a file created during the current job can be deleted. The auto-deletion

    facility records a deleted file in the REMOVE_DSN.LOG file in the printout directory. The Printout Viewer interface allows the user to view this log. When a file is referenced in more than one location within a job step, the KEEP/DELETE dispositions must all specify DELETE for a file to be deleted. If the dispositions conflict, the file is not deleted. Optional: No Type: option Trace-varying: No Multi-valued: No Options: 'KEEP' Keep the files created during the job. 'DELETE' Delete the files created during the job. 'ARCHIVE' Archive the files used during the job. 'WAN' Copy file to WAN Submission Host. 'WAN_DELETE' Copy file to WAN Submission Host. Delete file on Run Host. 'WAN_ARCHIVE' Copy file to WAN Submission Host. Archive file on Run Host. 'COMPRESS' Compress the files used by the job. 'COMPRESS_ARCHIVE' Compress and Archive files. 'COMPRESS_WAN_DELETE' Compress file for WAN. Delete file on Run Host. 'COMPRESS_WAN' Compress file, copy to WAN Submission Host. 'COMPRESS_WAN_ARCHIVE' Compress file, copy to WAN Submission Host, archive. Default: 'KEEP'

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     Input General FD_FILE_NAME Failed Step Table File Disposition

     5.0 Setup Parameters

     This parameter specifies whether the table files are kept or deleted when the processing step completes with an error. If deleted, the files are removed at the end of the step and cannot be accessed by the next step. Only a file created during the current job can be deleted. The auto-deletion facility records a deleted file in the REMOVE_DSN.LOG file in the printout directory. The Printout Viewer interface allows the user to view this log. When a file is referenced in more than one location within a job step, the KEEP/DELETE dispositions must all specify DELETE for a file to be deleted. If the dispositions conflict, the file is not deleted. Optional: No Type: option Trace-varying: No Multi-valued: No Options: 'KEEP' Keep the files created during the job. 'DELETE' Delete the files created during the job. 'ARCHIVE' Archive the files used during the job. 'WAN' Copy file to WAN Submission Host. 'WAN_DELETE' Copy file to WAN Submission Host. Delete file on Run Host. 'WAN_ARCHIVE' Copy file to WAN Submission Host. Archive file on Run Host. 'COMPRESS' Compress the files used by the job. 'COMPRESS_ARCHIVE' Compress and Archive files. 'COMPRESS_WAN_DELETE' Compress file for WAN. Delete file on Run Host. 'COMPRESS_WAN' Compress file, copy to WAN Submission Host. 'COMPRESS_WAN_ARCHIVE' Compress file, copy to WAN Submission Host, archive. Default: 'KEEP' TABLE Table of Input Files Table of input files. Optional: FILE_NAME Input File Name This parameter specifies the file name for seismic data. For example,

    /wgc/data/filename. No

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     Input General

     5.0 Setup Parameters

     5.2 Dataset Group Information

     General Information

     INPUT_DATASET_GROUP

     (Status: Optional, Type: standard)

     This parameter set is used when specifying dataset groups for the input data. The datasets in the dataset groups are either concatenated or merged, depending on whether the Merge Traces parameter set is specified.

     PARAMETERS:

     SD_DATASET_GROUP Successful Step Group Disposition This parameter specifies whether the group files are kept or deleted when the processing step completes successfully. If deleted, the files are removed at the end of the step and cannot be accessed by the next step. Only a file created during the current job can be deleted. The auto-deletion facility records a deleted file in the REMOVE_DSN.LOG file in the printout directory. The Printout Viewer interface allows the user to view this log. When a file is referenced in more than one location within a job step, the KEEP/DELETE dispositions must all specify DELETE for a file to be deleted. If the dispositions conflict, the file is not deleted. Optional: No Type: option Trace-varying: No Multi-valued: No Options: 'KEEP' Keep the files created during the job. 'DELETE' Delete the files created during the job. 'ARCHIVE' Archive the files used during the job. 'WAN' Copy file to WAN Submission Host. 'WAN_DELETE' Copy file to WAN Submission Host. Delete file on Run Host. 'WAN_ARCHIVE' Copy file to WAN Submission Host. Archive file on Run Host. 'COMPRESS' Compress the files used by the job. 'COMPRESS_ARCHIVE' Compress and Archive files. 'COMPRESS_WAN_DELETE' Compress file for WAN. Delete file on Run Host. 'COMPRESS_WAN' Compress file, copy to WAN Submission Host. 'COMPRESS_WAN_ARCHIVE' Compress file, copy to WAN Submission Host, archive. Default: 'KEEP'

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     Input General FD_DATASET_GROUP Failed Step Group Disposition

     5.0 Setup Parameters

     This parameter specifies whether the group files are kept or deleted when the processing step completes with an error. If deleted, the files are removed at the end of the step and cannot be accessed by the next step. Only a file created during the current job can be deleted. The

    auto-deletion facility records a deleted file in the REMOVE_DSN.LOG file in the printout directory. The Printout Viewer interface allows the user to view this log. When a file is referenced in more than one location within a job step, the KEEP/DELETE dispositions must all specify DELETE for a file to be deleted. If the dispositions conflict, the file is not deleted. Optional: No Type: option Trace-varying: No Multi-valued: No Options: 'KEEP' Keep the files created during the job. 'DELETE' Delete the files created during the job. 'ARCHIVE' Archive the files used during the job. 'WAN' Copy file to WAN Submission Host. 'WAN_DELETE' Copy file to WAN Submission Host. Delete file on Run Host. 'WAN_ARCHIVE' Copy file to WAN Submission Host. Archive file on Run Host. 'COMPRESS' Compress the files used by the job. 'COMPRESS_ARCHIVE' Compress and Archive files. 'COMPRESS_WAN_DELETE' Compress file for WAN. Delete file on Run Host. 'COMPRESS_WAN' Compress file, copy to WAN Submission Host. 'COMPRESS_WAN_ARCHIVE' Compress file, copy to WAN Submission Host, archive. Default: 'KEEP' INPUT_GROUP_TABLE Input Dataset Groups Optional: No

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     Input General DATASET_GROUP_NAME Group Name

     5.0 Setup Parameters

     Specify a Dataset Group, and Input General will concatenate or merge all the files in the group. Optional: Type: Trace-varying: Multi-valued: Options Exec: No dataset-group No No DatasetGroupExecOption

     LIMIT_INPUT_TABLE Limit Datasets Input by Summary Literals This table specifies limits for the datasets processed to only those that contain some data within all the specified summary literal ranges. Optional: LITERAL Literal Name This parameter specifies a literal in the table. Any parameter specified here must exist in all input data sets. Optional: Type: Trace-varying: Multi-valued: Options: 'IDENT_NUM' 'SHOTPOINT_NUM' 'CMP' 'SOURCE_DETECT_DIST'

    'SOURCE_DETECT_DIST.N' 'CMP.N' 'SOURCE_DETECT_DIST.Y' 'TRACE_NUM' 'FIELD_CHANNEL_NUM' 'GPS_TIME_DOUBLE' 'FIELDSHOT_ID' 'FLD_CABLE_NUM' 'LINE_ID' Default: Yes trace-attribute No Yes Yes

     NOT_USED

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     Input General START Literal Start Optional: Type: Trace-varying: Multi-valued: Default: END Literal End Optional: Type: Trace-varying: Multi-valued: Default: Yes number No No NOT_USED Yes number No No NOT_USED

     5.0 Setup Parameters

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