Seg Y Rev 1release 1-Books Pdf

SEG Y rev 1Release 1
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SEG Y rev 1 May 2002, 1 INTRODUCTION 1, 2 SUMMARY 1. 2 1 UNCHANGED ITEMS 1, 2 2 CHANGES FROM REV 0 TO REV 1 1. 2 3 NOTATION 1, 2 4 CONTROLLING ORGANIZATION 1, 2 5 ACKNOWLEDGMENTS 1. 3 SEG Y FILE STRUCTURE 2, 3 1 RECORDING MEDIUM 2, 3 2 FILE STRUCTURE 3. 3 3 NUMBER FORMATS 3, 3 4 VARYING TRACE LENGTHS 3, 3 5 COORDINATES 4.
4 TEXTUAL FILE HEADER 4, 5 BINARY FILE HEADER 6, 6 EXTENDED TEXTUAL FILE HEADER 9. 6 1 STRUCTURE OF EXTENDED TEXTUAL HEADER 10, 6 2 ENDTEXT STANZA 11. 6 3 STANZA EXAMPLE 11, 7 DATA TRACES 12, 7 1 TRACE HEADER 12. 7 2 TRACE DATA 20, APPENDIX A WRITING SEG Y DATA TO A DISK FILE 20. APPENDIX B SEG Y TAPE LABELS 21, APPENDIX C BLOCKING OF SEG Y FILES ON TAPE 23.
APPENDIX D EXTENDED TEXTUAL STANZAS 24, D 1 LOCATION DATA 24. D 1 1 Stanza for Location Data 24, D 1 2 Example Stanza for Location Data 26. D 2 BIN GRID DEFINITION 27, D 2 1 Stanza for Bin Grid Definition 27. D 2 2 Example for Bin Grid Definition 30, D 3 DATA GEOGRAPHIC EXTENT COVERAGE PERIMETER 31. D 3 1 Stanza for Data Geographic Extent 33, D 3 2 Example for Data Geographic Extent 33.
D 3 3 Stanza for Coverage Perimeter 34, D 3 4 Example Stanza for Coverage Perimeter 35. This example is based on Figure 3 35, D 4 DATA SAMPLE MEASUREMENT UNIT 36. D 4 1 Stanza for Data Sample Measurement Unit 36, D 4 2 Example stanza for Data Sample Measurement Unit 36. D 5 PROCESSING HISTORY 37, D 5 1 Stanza for Processing History 37. SEG Y rev 1 May 2002, D 5 2 Example stanza for Processing History 37.
D 6 SOURCE TYPE ORIENTATION 38, D 6 1 Stanza for Source Type Orientation 38. D 6 2 Example stanza for Source Type Orientation 38. D 7 SOURCE MEASUREMENT UNIT 39, D 7 1 Stanza for Source Measurement Unit 39. D 7 2 Example stanza for Source Measurement Unit 39. APPENDIX E DATA WORD FORMAT 39, APPENDIX F EBCDIC AND ASCII CODES 42. APPENDIX G REFERENCES 45, FIGURE 1 BYTE STREAM STRUCTURE OF A SEGY FILE WITH N EXTENDED TEXTUAL FILE HEADER. RECORDS AND M TRACES RECORDS 2, FIGURE 2 BIN GRID DEFINITION 28.
FIGURE 3 VARIOUS DATA EXTENTS AND COVERAGE PERIMETERS FOR A SEISMIC SURVEY 32. TABLE 1 TEXTUAL FILE HEADER 5, TABLE 2 BINARY FILE HEADER 6. TABLE 3 TRACE HEADER 12, TABLE 4 SEG Y TAPE LABEL 21. TABLE 5 STANZA FOR LOCATION DATA 24, TABLE 6 STANZA FOR BIN GRID DEFINITION 28. TABLE 7 STANZA FOR DATA GEOGRAPHIC EXTENT 33, TABLE 8 STANZA FOR COVERAGE PERIMETER 34. TABLE 9 STANZA FOR DATA SAMPLE MEASUREMENT UNIT 36. TABLE 10 STANZA FOR PROCESSING HISTORY 37, TABLE 11 STANZA FOR SOURCE TYPE ORIENTATION 38.
TABLE 12 STANZA FOR SOURCE MEASUREMENT UNIT 39, TABLE 13 IBM 3270 CHAR SET REF CH 10 GA27 2837 9 APRIL 1987 42. SEG Y rev 1 May 2002, the use of some existing entries is. 1 Introduction clarified, Since the original SEG Y Data Exchange An Extended Textual File Header. Format revision 0 reference page 45 was consisting of additional 3200 byte. published in 1975 it has achieved Textual File Headers blocks is. widespread usage within the geophysical introduced. industry This widespread usage has The data in the Extended Textual File. brought about many proprietary variations Header uses a stanza layout and. Since the publication of SEG Y rev 0 the standard stanzas are defined. nature of seismic data acquisition, processing and seismic hardware has Trace identification is expanded. changed significantly The introduction of 3, Engineering conversions are introduced.
D acquisition techniques and high speed, high capacity recording media dictate the The Textual File Header and the. need for revisions to the SEG Y rev 0 Extended Textual File Header can be. format The major changes introduced by encoded as EBCDIC or ASCII. SEG Y rev 1 are standardizing the location characters. of header information needed for current, processing practices and defining a SEG Y 2 3 Notation. data set as a byte stream format The SEG, Technical Standards Committee strongly The term CDP as used in this document is. encourages producers and users of SEG Y used as a synonym for the term CMP. data sets to move to the revised standard in, an expeditious fashion 2 4 Controlling Organization. The SEG Y rev1 is administered by the, 2 Summary SEG Technical Standards Committee Any.
questions corrections or problems, 2 1 Unchanged Items encountered in the format should be. addressed to, EBCDIC encoding is allowed for text, The size of the original 3200 byte Society of Exploration Geophysicist. Textual File Header 400 byte Binary P O Box 702740. File Header and 240 byte Trace Tulsa Ok 74170 2740. Attention SEG Technical Standards, The data locations for the initial 3200. byte Textual File Header, Phone 918 497 5500, 2 2 Changes from rev 0 to rev 1 Fax 918 497 5557. Internet site www seg org, A SEG Y file may be written to any.
medium that is resolvable to a stream of, 2 5 Acknowledgments. variable length records, The SEG Technical Standards Committee. The data word formats are expanded to would like to acknowledge the time and. include four byte IEEE floating point effort put forth by a great many individuals. and one byte integer data words and organizations Special commendation. A small number of additional fields in the goes to the P E S G B Data Management. 400 byte Binary File Header and the Group The chairman of P E S G B Data. 240 byte Trace Header are defined and Management Group was Jill Lewis The. SEG Y rev 1 May 2002, Optional 3200 400 byte 1st Nth 1st 1st Mth Mth. SEG Y byte Binary 3200 byte 3200 byte 240 byte Data 240 byte Data. Tape Textual File Extended Extended Trace Trace Trace Trace. File Header Textual Textual Header Header, Label Header File File. Header Header, Optional Optional, Figure 1 Byte stream structure of a SEGY file with N Extended Textual File Header records.
and M traces records, principal members were Bob Firth Eleanor devices such as 9 track tape and 3480. Jack and Jill Holliday Roger Lott produced cartridges which can achieve this in. the Extended Textual stanzas for Location hardware It also includes high capacity. Data Bin Grid Definition and Data Extent tape devices such as DD2 or 3590. Thanks go to Frank Brassil for organizing although with these it is desirable to use. the response from the Australian Geological some kind of blocking and or logical. Society encapsulation to use the tape more, efficiently and possibly to allow the. 3 SEG Y File Structure recording of associated metadata. A SEG Y file may be written as a logical file, The original SEG Y standard was produced. to a SEG RODE encapsulated tape, at a time when 9 track tape was the normal. Obviously when seismic data is being, storage medium for seismic data with 800.
exchanged in SEG Y format the medium, bpi and 1600 bpi in common usage and. and encapsulation scheme used must be, 6250 bpi on the horizon The revised format. acceptable to both the provider and, is intended to be independent of the actual. recipient of the data, medium on which it is recorded. One important class of media that does not, The stipulation in the 1975 standard that no.
conform to the variable length record model, more than one line of seismic data is. is the disk file which is defined on modern, permitted on any one reel became. systems as a byte stream without any, impractical long ago The term SEG Y file. structure It has become common practice, shall be used in this revision in place of the. to write SEG Y data to disk including CD, term seismic reel used in the original.
ROM for data distribution Certain rules, standard For this standard the terms file. have to be followed for this to work, and data set are synonymous Both terms. correctly Appendix A defines how SEG Y, are a collection of logically related data. data should be written to a disk file, traces or ensembles of traces and the. associated ancillary data In order to make SEG Y consistent with the. SEG D Rev 2 standard Appendix B defines, 3 1 Recording Medium a tape label for SEG Y tapes using a format.
based on the RP66 Storage Unit Label, The SEG Y format described in the 1975 Labels are not mandatory for SEG Y but. standard defined a data format that was their use is highly desirable in environments. dependent on 9 track tape With the such as robotic tape libraries and large. revised format a SEG Y file may be written scale processing centers. to any medium that supports variable length, records Whatever medium is used the Appendix C defines a simple blocking. data must be resolvable to a stream of scheme for SEG Y data to allow more. variable length records This includes tape efficient use of high capacity tape media. SEG Y rev 1 May 2002, This is based on the scheme defined in the All values in the Binary File Header and the. SEG D Rev 2 standard Trace Header are two s complement. integers either two bytes or four bytes long, 3 2 File Structure There are no floating point values defined in. the headers, Figure 1 illustrates the structure of a SEG Y.
file The first 3600 bytes of the file are the Trace Data sample values are either two s. Textual File Header and the Binary File complement integers or floating point This. Header written as a concatenation of a revision adds data sample formats of 8 bit. 3200 byte record and a 400 byte record integer and 32 bit IEEE floating point Both. This is optionally followed by Extended IBM floating point as defined in the original. Textual File Header s which consists of standard and IEEE floating point values are. zero or more 3200 byte Extended Textual written in big endian byte order i e with the. File Header records The remainder of the sign exponent byte written closest to the. SEG Y file contains a variable number of beginning of the file. Data Trace records that are each, proceeded by a 240 byte Trace Header 3 4 Varying Trace Lengths. The Extended Textual File Header is the, The SEG Y standard specifies fields for. only structural change introduced in this, sampling interval and number of samples at. revision and while not strictly downward, two separate locations in the file The. compatible with the 1975 SEG Y format it, Binary File Header contains values that.
has been carefully designed to have, apply to the whole file and the Trace. minimal impact on existing SEG Y reader, Headers contain values that apply to the. software It should be simple for existing, associated trace The original standard is. software to be modified to detect the, unclear about how these are to be used. presence of the new header and either, together One view is that variable length.
process or ignore the Extended Textual File, traces are supported in SEG Y with the. Header The format of the Extended, number of samples in the trace header. Textual File Header is described fully in, allowed to vary from trace to trace and to. vary from the value in the Binary File, Header An alternate view is that all traces. 3 3 Number Formats in a SEG Y file will be the same length and. In the 1975 SEG Y standard all binary the value for the number of samples will be. values are defined as using big endian the same in the Binary File Header and all. byte ordering This conformed to the IBM Trace Headers In the second case the. tape standard and means that within the data traces are padded or truncated as. bytes that make up a number the most necessary, significant byte containing the sign bit is In SEGY rev 1 varying trace lengths in a file.
written closest to the beginning of the file are explicitly allowed The values for. and the least significant byte is written sampling interval and number of samples in. closest to the end of the file This byte the Binary File Header should be for the. ordering convention is maintained in this primary set of seismic data traces in the file. revision of the SEG Y format and it should This approach allows the Binary File Header. be adhered to for all conforming versions of to be read and say for instance this is six. SEG Y This is independent of the medium seconds data sampled at a two millisecond. to which a particular SEG Y file is written sampling interval The value for the. i e the byte ordering is no different if the number of samples in each individual Trace. file is written to tape on a mainframe or to Header may vary from the value in the. disk on a PC Binary File Header and reflect the actual. number of samples in a trace The number, SEG Y rev 1 May 2002. of bytes in each trace record must be Headers and the Trace Headers A single. consistent with the number of samples in CRS must be used for all coordinates within. the Trace Header This is particularly an individual SEG Y data set Additionally. important for SEG Y data written to disk files the coordinate units must be the same for. see Appendix A all coordinates, Allowing variable length traces dictates. sequential access and precludes random, access in a disk file since the locations of 4 Textual File Header. traces after the first are not known To, enable the option of random access a new The first 3200 byte Textual File Header. field in the Binary File Header has been record contains 40 lines of textual. defined as a fixed length trace flag If this information providing a human readable. flag is set all traces in the file must have the description of the seismic data in the SEG Y. same length This will typically be the case file This information is free form and is the. SEG Y rev 1 May 2002 1 1 Introduction Since the original SEG Y Data Exchange Format revision 0 reference page 45 was published in 1975 it has achieved widespread usage within the geophysical industry This widespread usage has brought about many proprietary variations Since the publication of SEG Y rev 0 the

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