A method for stepwise synthesis of node instrument shot data

Abstract

This invention discloses a step-by-step synthesis method for nodal instrument shot gather data, relating to the field of seismic exploration technology. The invention includes the following steps: collecting source point shot-receiver relationship files for synthesizing single-shot data to form a general source point shot-receiver relationship file; determining the start and end range of the general source point shot-receiver relationship file's file numbers based on the single-shot data file numbers corresponding to each source point in the general source point shot-receiver relationship file; and identifying the minimum and maximum station numbers among all receiver alignments based on the general source point shot-receiver relationship file to determine the alignment line station number range. This invention employs a step-by-step synthesis method. After the receiver alignment is retrieved, all data collected by that alignment can be segmented and synthesized for output, advancing the shot gather data synthesis time. This allows for earlier understanding of the nodal alignment data situation, and multiple machines from multiple nodal data synthesis working groups can perform the data synthesis simultaneously, solving the problem of existing nodal instrument shot gather data being difficult to synthesize step-by-step, resulting in delayed data presentation.

Description

Technical Field

[0001] This invention belongs to the field of seismic exploration technology, and in particular relates to a method for stepwise synthesis of nodal instrument shot gather data. Background Technology

[0002] Seismic prospecting is a method of prospecting for minerals that uses elastic waves generated by artificial earthquakes. It is one of the most accurate geophysical exploration methods. At one location on the ground, the energy from an explosion of explosives or a hammer blow is used to generate elastic waves. At another location, a geophone picks up the waves that are refracted or reflected back to the ground at different velocities from the interfaces of underground rock strata. A seismograph measures the time it takes for the waves to reach the measuring point to determine the location of the stratigraphic interface. Since the interfaces of stratigraphic strata of different lithologies and sedimentary discontinuities can form seismic wave velocity interfaces, seismic methods can be very effective in studying the stratification of strata and related geological structures in areas where sedimentary rocks are distributed.

[0003] Due to their lightweight and flexible characteristics, nodal instruments are now widely used in seismic acquisition projects. Nodal instrument acquisition stations operate independently, storing acquired seismic data on their memory cards. Data from nodal acquisition stations generally cannot be directly transmitted to a data synthesis center for shot gather data synthesis. Instead, shot gather data is synthesized only after all data from the receiving arrays has been collected and downloaded. Because the receiving arrays at the seismic source points are collected in stages during actual production, shot gather data files from nodal instruments cannot be synthesized until all data from the corresponding receiving arrays at the source point has been collected and downloaded. During this period, the synthesis of shot gather data files can only begin after all data from the corresponding receiving arrays has been collected and downloaded.

[0004] Therefore, existing methods for synthesizing nodal instrument shot gather data have certain shortcomings in practical use, and there is an urgent need for improved technologies to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a step-by-step synthesis method for nodal instrument shot gather data. After the receiving line section is partially recovered, the step-by-step synthesis method allows all data collected by that line to be segmented and synthesized for output, advancing the shot gather data synthesis time. This enables an earlier understanding of the nodal line data situation, solving the problem of existing nodal instrument shot gather data being difficult to synthesize step-by-step, resulting in a relatively late presentation of the synthesized data. Furthermore, multiple machines from multiple nodal data synthesis working groups can perform the data synthesis simultaneously, reducing the hardware requirements of the data processing host.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0007] This invention provides a step-by-step synthesis method for nodal instrument shot gather data, comprising the following steps:

[0008] S1: Gather the source point shot-detector relationship files of the single shot data to be synthesized into a total source point shot-detector relationship file, and determine the start and end range of the file number of the total source point shot-detector relationship file according to the single shot data file number corresponding to each source point in the total source point shot-detector relationship file.

[0009] S2: Based on the overall source point shot-detection relationship file, find the minimum and maximum station numbers among all receiver alignments and determine the station number range of the alignments;

[0010] S3: Based on the chainage range determined in S2, the chainage range of the total source point shot detection relationship file is divided into N chainage segments.

[0011] S4: Determine the number of the permutation line that needs to be split based on the data synthesis required, and obtain the range of permutation line numbers to be split.

[0012] S5: Based on the file number start and end range determined in S1, the N station number segment range determined in S3, and the line number range determined in S4, the total source point shot-detection relationship file is split. After splitting, the sub-shot-detection relationship files corresponding to the N station number segment ranges are output according to the relationship file format. Each station number segment corresponds to a node data synthesis working group.

[0013] S6: After the node acquisition stations on the arrangement line are retrieved and the data download is completed, the data synthesis working group for each chainage segment calls the original data of the corresponding chainage segment node acquisition station, the sub-shot detection relationship file of the split source point corresponding to the chainage segment, and the content of the correspondence table file between the receiving arrangement line chainage of the source point and the node acquisition station equipment number. Based on the excitation time of the source point, the data of a specified length is extracted from the downloaded original data of the node acquisition station, synthesized according to the shot gathering data format, and the shot gathering arrangement segment data file of the chainage segment is output.

[0014] S7: After the gun gathering arrangement segment data files corresponding to the N station number segments are all synthesized, the gun gathering arrangement segment data files generated after synthesizing the N station number segments are all summarized together, and then the gun gathering arrangement segment data files of all N station number segments are used to synthesize a gun gathering arrangement line data file containing only the split arrangement line.

[0015] S8: When there are more arrangement lines that can be retrieved, determine the range of line numbers that can be split in the new round, repeat S4 to S7, and synthesize the gun set arrangement line data file of the newly split arrangement lines according to the above method.

[0016] S9: Repeat S8, and after multiple synthesis, complete the synthesis of the shot gather data file of all receiver arrays of the source point. Gather the shot gather data of all receiver arrays of the source point together, and use these data to synthesize the complete source point shot gather data containing all receiver arrays. At this point, the synthesis of the node single shot data file is completed.

[0017] Furthermore, the range of file numbers in S1 includes the file numbers of the corresponding source points in all source point shot-detection relationship files.

[0018] Furthermore, the range of station numbers in S2 includes the range of station numbers of the receiving station numbers in all source point shot-detection relationship files.

[0019] Furthermore, the N station number segments in S3 can be combined to form the entire station number range, and there is no overlap between the station number ranges of each station number segment, that is, there are no duplicate station numbers.

[0020] Furthermore, the range of arrangement line numbers in S4 is the range of arrangement line numbers recovered in actual production on that day.

[0021] Furthermore, in step S9, all the shot gather arrangement data files of the source point are collected together, and then the complete shot gather arrangement data is used to synthesize a complete shot gather data file of the source point. That is, this source point shot gather data file contains the receiver arrangement specified in the source point shot-receiver relationship file.

[0022] The present invention has the following beneficial effects:

[0023] 1. The present invention adopts a step-by-step synthesis method. When the receiving line is retrieved, all the data collected by the line can be cut and synthesized for output. As long as a node line is retrieved, node data can be synthesized, thus advancing the synthesis time of the gun gathering data and allowing the node arrangement data to be understood as early as possible.

[0024] 2. After each synthesis of the shot collection array data, the present invention provides data on different seismic source points corresponding to the same array segment. This is equivalent to data collected by the node stations on the same array line at different times. Furthermore, since the number of array lines is small at this time, it is convenient to check the data and understand the working status of the node acquisition stations.

[0025] 3. This invention splits the shot inspection relationship file into N sub-shot inspection relationship files based on N station number segments. Each station number segment corresponds to a node data synthesis working group. During data synthesis, multiple machines of multiple node data synthesis working groups work simultaneously, reducing the hardware requirements of the data synthesis host. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] Please see Figure 1 As shown, this invention provides a step-by-step synthesis method for nodal instrument shot gather data, comprising the following steps:

[0030] S1: Gather the source point shot-detector relationship files of the single shot data to be synthesized into a total source point shot-detector relationship file, and determine the start and end range of the file number of the total source point shot-detector relationship file based on the single shot data file number corresponding to each source point in the total source point shot-detector relationship file. The start and end range of the file number includes the file numbers of all source points in the source point shot-detector relationship file.

[0031] S2: Based on the overall source-shot-detection relationship file, find the minimum and maximum station numbers among all receiver alignments to determine the alignment station number range, or determine the alignment station number range based on the minimum and maximum station numbers among all alignments placed in the field. This alignment station number range includes the alignment station number ranges of all alignments in the source-shot-detection relationship file.

[0032] S3: Based on the chainage range determined in S2, the chainage range of the total source point shot detection relationship file is divided into N chainage segments. The N chainage segments can be combined to form the entire chainage range. There is no overlap between the chainage segments, i.e., no duplicate chainages. The number of chainage segments is arbitrary, generally divided into no more than 10 fixed chainage segments according to actual needs, to facilitate the synthesis of actual single shot data. In actual production, the chainage segmentation is generally combined with the task chainage segments of the field arrangement team in production, so as to ensure that the data synthesis corresponds to the field production and construction arrangements, and to facilitate communication and coordination of problems encountered during the data download and synthesis process at the node acquisition station.

[0033] S4: Based on the data synthesis of the arrangement line numbers, determine the arrangement line numbers that need to be split, and obtain the range of arrangement line numbers to be split. In actual production, the range of arrangement line numbers is all the arrangement line numbers to be recovered on the same day.

[0034] S5: Based on the file number start and end range determined in S1, the N station number segment ranges determined in S3, and the arrangement line number range determined in S4, the overall source point shot-detector relationship file is split. After splitting, the sub-shot-detector relationship files corresponding to the N station number segment ranges are output according to the relationship file format. Each station number segment corresponds to a node data synthesis working group. If the receiver arrangement line of the source point corresponding to a certain file number in the overall source point shot-detector relationship file does not contain the split arrangement line number, then the split N sub-shot-detector relationship files do not contain that file number. If the receiver arrangement line of the source point corresponding to a certain file number in the overall source point shot-detector relationship file contains the split arrangement line number, and the receiver station number range used by that arrangement line belongs to a certain station number segment range, then the sub-shot-detector relationship file corresponding to that station number segment range contains that file number. Otherwise, the sub-shot-detector relationship file corresponding to that station number segment range does not contain that file number.

[0035] S6: After the node acquisition stations on the array line are retrieved and the data download is completed, the data synthesis working group for each chainage segment calls the original data of the corresponding chainage segment node acquisition station, the sub-shot detection relationship file of the split source point corresponding to the chainage segment, and the correspondence table file between the chainage number of the source point receiving array line and the equipment number of the node acquisition station. Based on the excitation time of the source point, the data of a specified length is extracted from the downloaded original data of the node acquisition station, and synthesized according to the shot gathering data format, and the shot gathering array segment data file of the chainage segment is output. The shot gathering array segment data file is generated as one file for each receiving array line, and the file naming method is: file number-line number-chainage segment;

[0036] S7: After the gun gathering arrangement segment data files corresponding to the N station number segments have been synthesized, all the gun gathering arrangement segment data files generated after synthesizing the N station number segments are summarized together. Then, the gun gathering arrangement segment data files of all N station number segments are used to synthesize a gun gathering arrangement line data file containing only the split arrangement lines. The gun gathering arrangement line data file is generated as one file for each receiving arrangement line. The file naming method is: file number-line number.

[0037] S8: When there are more arrangement lines that can be retrieved, determine the range of line numbers that can be split in the new round, repeat S4 to S7, and synthesize the gun set arrangement line data file of the newly split arrangement lines according to the above method.

[0038] S9: Repeat S8, and after multiple synthesis, complete the synthesis of the shot gather data files of all receiver arrangements at the source point. Gather all the shot gather data files of the source point together, and then use the complete shot gather data to synthesize a complete shot gather data file of the source point. That is, this shot gather data file of the source point contains all receiver arrangements. At this point, the synthesis of the single shot data file of the node is completed.

[0039] The above are merely preferred embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present invention.

Claims

1. A method for step-by-step synthesis of nodal instrument shot gather data, characterized in that: Includes the following steps: S1: Gather the source point shot-detector relationship files of the single shot data to be synthesized into a total source point shot-detector relationship file, and determine the start and end range of the file number of the total source point shot-detector relationship file according to the single shot data file number corresponding to each source point in the total source point shot-detector relationship file. S2: Based on the overall source point shot-detection relationship file, find the minimum and maximum station numbers among all receiver alignments and determine the station number range of the alignments; S3: Based on the chainage range determined in S2, the chainage range of the total source point shot detection relationship file is divided into N chainage segments. S4: Determine the number of the permutation line that needs to be split based on the data synthesis required, and obtain the range of permutation line numbers to be split. S5: Based on the file number start and end range determined in S1, the N station number segment range determined in S3, and the line number range determined in S4, the total source point shot-detection relationship file is split. After splitting, the sub-shot-detection relationship files corresponding to the N station number segment ranges are output according to the relationship file format. Each station number segment corresponds to a node data synthesis working group. S6: After the node acquisition stations on the arrangement line are retrieved and the data download is completed, the data synthesis working group for each chainage segment calls the original data of the corresponding chainage segment node acquisition station, the sub-shot detection relationship file of the split source point corresponding to the chainage segment, and the content of the correspondence table file between the receiving arrangement line chainage of the source point and the node acquisition station equipment number. After extracting the data of a specified length from the downloaded original data of the node acquisition station according to the source point excitation time, the data is synthesized according to the shot gathering data format and the shot gathering arrangement segment data file of the chainage segment is output. S7: After the gun gathering arrangement segment data files corresponding to the N station number segments are all synthesized, the gun gathering arrangement segment data files generated after synthesizing the N station number segments are all summarized together, and then the gun gathering arrangement segment data files of all N station number segments are used to synthesize a gun gathering arrangement line data file containing only the split arrangement line. S8: When there are more arrangement lines that can be retrieved, determine the range of line numbers that can be split in the new round, repeat S4 to S7, and synthesize the gun set arrangement line data file of the newly split arrangement lines according to the above method. S9: Repeat S8, and after multiple synthesis, complete the synthesis of the shot gather data file of all receiver arrays of the source point. Gather the shot gather data of all receiver arrays of the source point together, and use these data to synthesize the complete source point shot gather data containing all receiver arrays. At this point, the synthesis of the node single shot data file is completed.

2. The method for step-by-step synthesis of nodal instrument shot gather data according to claim 1, characterized in that, The file number range in S1 includes the corresponding file numbers in all source point shot-detection relationship files.

3. The method for step-by-step synthesis of nodal instrument shot gather data according to claim 1, characterized in that, The range of station numbers in S2 includes the range of receiver station numbers in all source point shot-detection relationship files.

4. The method for step-by-step synthesis of nodal instrument shot gather data according to claim 1, characterized in that, The N station number segments in S3 can be combined to form the entire station number range, and there is no overlap between the station number ranges of each station number segment.

5. The method for step-by-step synthesis of nodal instrument shot gather data according to claim 1, characterized in that, The range of arrangement line numbers in S4 refers to the arrangement line numbers recovered in actual production on that day.

6. The method for step-by-step synthesis of nodal instrument shot gather data according to claim 1, characterized in that, In step S9, all the shot gather arrangement data files of the source point are collected together, and then the complete shot gather arrangement data is used to synthesize a complete shot gather data file of the source point. That is, this source point shot gather data file contains all the receiver arrangement lines specified in the source point shot-receiver relationship file.

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