Extraction method of active source seismic data collected by cable-free node instrument

Abstract

The present invention provides a method for extracting active source seismic data collected by a cable-free node instrument, comprising: obtaining a list of source excitation time, an original SPS relationship file, and a list of node instrument equipment information; establishing an SPS relationship file containing accurate source excitation time; determining the primary and secondary index keyword combination relationship of the output track set; establishing an excitation reception associated information index file; querying and locking the time continuous record file of the corresponding moment; extracting track data; completing the extraction of all seismic track data and forming a seismic data track set; performing a loop to complete the extraction of all track sets corresponding to the primary index keyword values. The method for extracting active source seismic data collected by a cable-free node instrument can quickly extract seismic acquisition data within the effective period of active source excitation, generate a common shot point track set or a common receiving point track set, and meet the needs of on-site data quality monitoring of seismic acquisition and indoor seismic data processing.

Description

Technical Field

[0001] The invention relates to the technical field of seismic exploration data processing and interpretation, and in particular to a method for extracting active source seismic data collected by a cable-free node instrument. Background Art

[0002] In the field seismic data collection process of oil and gas seismic exploration, cabled seismic acquisition equipment is usually used to connect all the excitation and receiving systems through cables and realize seismic information collection operations. The cabled acquisition method is time-sharing acquisition and self-collection and storage. That is, synchronous acquisition is carried out during excitation, and the seismic signals received by the detector are collected and stored together on the instrument vehicle through cables. The entire acquisition process has a long preparation time, many restrictive factors, high labor intensity for construction personnel, and low construction efficiency. Cableless node-type seismic signal acquisition equipment (cableless node instrument) is a node instrument equipment that integrates the detector and the acquisition and storage instrument. It has the advantages of being small and light, flexible in layout, etc., which can save many complicated links of traditional cable acquisition, and the construction is fast and efficient. The cableless node-type acquisition method is full-time acquisition, self-collection and self-storage, that is, the node instrument is started before excitation, and the detector passively receives seismic signals all the time and stores them in the node instrument in real time. The node instrument saves the recording time of real-time acquisition data through GPS timing, eliminating manual synchronization operations. Therefore, compared with traditional cable acquisition, during the entire construction process of the cableless node seismic acquisition method, the preparation and deployment of acquisition instruments is short, there are fewer restrictive factors, the labor intensity is low, and the construction efficiency is high. It is a revolutionary development in field seismic data acquisition technology.

[0003] At present, cableless node seismic acquisition technology has been applied in oil and gas exploration, development and production processes such as high-density seismic acquisition on complex surfaces, real-time monitoring of microseismic data during reservoir fracturing, and active and passive seismic monitoring of reservoir development, and has shown unique advantages over traditional cable acquisition. However, the full-time acquisition, self-collection and self-storage seismic data recording method of cableless acquisition, as well as its data format and data scale, are essentially different from the time-sharing acquisition and self-collection and co-storage of cable acquisition. The full-time acquisition data contains both underground passive source signals before the active excitation of artificial seismic sources and active source seismic data after the excitation of artificial seismic sources. It is difficult to separate the two in a timely and accurate manner, which makes it difficult to directly apply the generated seismic acquisition data in existing seismic processing software. This makes it difficult to analyze and monitor the real-time quality of seismic data at the field acquisition site. At the same time, as high-speed channel density and efficient acquisition construction become normalized, the efficiency of field seismic acquisition has been greatly improved, and the scale of recorded data generated by full-time acquisition of cableless node instruments is huge, which brings great storage space requirements.

[0004] In the Chinese patent application with application number: CN201611135848.0, a node-type seismograph data file management system and method are involved, which belongs to the field of geological exploration data management technology. The system includes a raw data file parsing module and a file merging module; the raw data file parsing module parses the raw data file recorded by the node-type seismograph according to the predefined data frame format to obtain sampling information; the file merging module merges the data files collected by different numbered collection stations according to the sampling information. The method includes parsing the raw data file recorded by the node-type seismograph according to the predefined data frame format to obtain the sampling information of the raw data file; and merging the data files collected by different numbered collection stations according to the sampling information.

[0005] In the Chinese patent application with application number: CN201710637852.5, a method and device for processing seismic data are involved, wherein the method comprises: obtaining seismic data collected by a first detection point in a node instrument; storing the seismic data of each shot point in a plurality of shot points in the seismic data collected by the first detection point into a corresponding shot collection file, wherein the shot points correspond one to one with the shot collection files; upon determining that the seismic data of each shot point in the seismic data collected by the first detection point has been stored in the corresponding shot collection file, obtaining the seismic data collected by a second detection point in the node instrument, and storing the seismic data of each shot point in the plurality of shot points in the seismic data collected by the second detection point into the corresponding shot collection file.

[0006] In the Chinese patent application with application number: CN201711287275.8, a method for recovering data of a cableless storage seismograph is involved. First, a cableless storage seismograph data recovery topology system based on a switch is built. The cableless storage seismograph connected to the switch port is regarded as a collection station node. The host creates a recovery data file table and sends it to each collection station node through the switch. After each collection station node parses the recovery data file table, it can retrieve data files that meet the requirements in parallel. Finally, each collection station node uploads the data files in parallel.

[0007] The above existing technologies are quite different from the present invention and fail to solve the technical problems we want to solve. It is urgent to form a method for accurately and efficiently extracting artificial active source seismic data from the seismic acquisition records of cable-free node instruments to form common shot point or common receiving point gathers to meet the needs of seismic data quality control and indoor processing at the acquisition site. To this end, we have invented a new method for extracting active source seismic data collected by cable-free node instruments. Summary of the invention

[0008] The object of the present invention is to provide a method for extracting active source seismic data collected by a cable-free node instrument, which can form a common shot point or common receiving point gather to meet the needs of quality control of seismic data collected on site and indoor processing.

[0009] The object of the present invention can be achieved by the following technical measures: a method for extracting active source seismic data collected by a cable-free node instrument, the method for extracting active source seismic data collected by a cable-free node instrument comprising:

[0010] Step 1, obtain the source excitation time list, the original SPS relationship file and the node instrument equipment information list;

[0011] Step 2, establishing an SPS relationship file containing precise source excitation time;

[0012] Step 3, determining the combination relationship between the primary index keyword and the secondary index keyword of the output gather;

[0013] Step 4, creating an excitation receiving associated information index file;

[0014] Step 5, query and lock the time continuous record file of the corresponding moment;

[0015] Step 6, extracting data;

[0016] Step 7, complete the extraction of all seismic trace data and form a seismic data gather;

[0017] Step 8, looping through steps 5 to 7, and completing the extraction of all gathers corresponding to the primary index keyword values.

[0018] The purpose of the present invention can also be achieved by the following technical measures:

[0019] In step 1, the source excitation time list file contains the field file number of the source single shot and the GPS time of its corresponding excitation moment.

[0020] In step 1, the original SPS relationship file includes the field file number, shot line number, excitation point number, start channel number, end channel number, receiving line number, start receiving point number, and end receiving point number information of a single shot.

[0021] In step 1, the node instrument device list file includes the node instrument device number, the node instrument belonging receiving line number and the receiving point number.

[0022] In step 2, an SPS relationship file containing the source excitation time is established based on the source excitation time list and the original SPS relationship file, and the accuracy of the source excitation time is ensured to be accurate to milliseconds.

[0023] In step 3, two main and secondary index keyword combination relationships are determined; one is a combination relationship in which the single-gun field file number is the main index keyword and the node instrument equipment number is the secondary index keyword; the other is a combination relationship in which the node instrument equipment number is the main index keyword and the single-gun field file number is the secondary index keyword.

[0024] In step 4, using the receiving point matching relationship between the SPS relationship file containing the precise source excitation time and the node instrument equipment information list, based on the determined primary and secondary index keyword combinations, an excitation-reception associated information index file containing the correspondence between the single-shot field file number, source excitation time and node instrument equipment number is established.

[0025] In step 4, when the primary and secondary index keywords are the single-shot field file number and the node instrument equipment number, respectively, the receiving line number and the starting and ending receiving point number combinations contained in the SPS relationship file containing the source excitation time are used to extract the belonging receiving line number and the receiving point number combination and its corresponding node instrument equipment number from the node instrument equipment list file to establish a corresponding excitation reception association information index file.

[0026] In step 4, when the primary and secondary index keywords are the node instrument equipment number and the single-shot field file number respectively, according to the node instrument belonging receiving line number and receiving point number contained in the node instrument equipment list file, all single-shot field file numbers and their shot line numbers, excitation point numbers, starting channel numbers, ending channel numbers, and source excitation time corresponding to the combination of the node instrument belonging receiving line number and the receiving point number are extracted from the SPS relationship file containing the precise source excitation time to establish a corresponding excitation-reception association information index file.

[0027] In step 5, according to the node instrument device number and its corresponding source excitation time contained in the excitation reception associated information index file, the node instrument device record file directory is located from the storage medium, and the time continuous record file of the corresponding moment is queried and locked.

[0028] In step 5, based on the node instrument number contained in the current index information in the excitation reception associated information index file and the year, month and day information of the source excitation time, query whether there is a binary file with continuous time records corresponding to the hourly moment of the source excitation time in the file directory with the node instrument number string as the first-level file directory and the string constructed with the year, month and day of the source excitation time as the second-level file directory.

[0029] In step 5, when a binary file of continuous time recording corresponding to the hourly moment of source excitation exists, the initialization information of the node instrument equipment and the full-time recording status information are verified from the file header information of the file to see whether they are normal; when all the verification feedback information is normal, the current index information is valid; when the queried binary file does not exist, or the verification feedback information is abnormal, proceed to the next index information.

[0030] In step 6, based on the characteristics of the node instrument output data being continuous recording and equally spaced sampling, the earthquake source excitation time and the start recording time of the current binary data file, the hours and the time thereafter are converted and accumulated into milliseconds.

[0031] In step 6, according to the source excitation time, the duration of the trace data to be extracted and the node instrument data recording sampling interval, the start and end storage positions of the effective acquisition data in the locked time continuous recording file are located to complete the trace data extraction.

[0032] In step 7, when the single-shot field file number is used as the main index keyword, the corresponding valid time period trace data in all the node instruments associated with the single field file number are extracted and aggregated to form the common shot point gather record data.

[0033] In step 7, when the node instrument equipment number is the main index keyword, the active source excitation effective period corresponding to all the associated single-shot field file numbers of a single node instrument equipment is extracted and aggregated to form the common receiving point gather data.

[0034] In step 8, during the loop of the primary index keyword value, MPI is used to implement multi-process parallel computing among multiple computing nodes. Each computing process completes the extraction of the corresponding track data of a single primary index keyword value, thereby extracting and outputting all track records.

[0035] The method for extracting active source seismic data collected by a cableless node instrument in the present invention is based on field collection of source excitation time, SPS relationship data and cableless node instrument equipment information. First, a new SPS relationship file containing precise source excitation time is established. After determining the primary and secondary index keyword combination relationship of the output track set, an excitation reception associated information index file containing the corresponding relationship between the single-shot field file number, precise source excitation time and node instrument equipment number is established according to the receiving point matching relationship between the new SPS relationship file and the node instrument equipment information list. Secondly, according to the node instrument equipment number and source excitation time information contained in the excitation reception associated information index file, the node instrument equipment record file directory is located, and the time continuous record file at the corresponding moment is queried and locked. Then, according to the source excitation time and the output track data duration, the start and end positions of the data to be extracted in the time continuous record file are located, and the track data extraction is completed. Finally, the valid track data corresponding to all primary and secondary index keyword combinations are extracted, and the collection forms the seismic track set data. The present invention establishes a correlation information index based on the excitation and receiving information files recorded during the field acquisition process, quickly extracts artificially excited active source seismic data from the full-time recording files of the cableless node instrument, and generates common shot point gathers or common receiving point gathers to meet the needs of on-site data quality monitoring of seismic acquisition and indoor seismic data processing.

[0036] The method for extracting active source seismic data collected by the cable-free node instrument utilizes the mutual correspondence contained in the excitation-reception association information index file, and can quickly determine the corresponding node instrument original record data file according to the shot point field file number, node instrument equipment number (i.e., receiving point) and excitation time information contained in the index information. According to the recording time of the data to be extracted determined by the user, the start and end positions of the extracted data in the original record data file are determined.

[0037] The method for extracting active source seismic data collected by the cable-free node instrument identifies and verifies the node instrument device initialization state and recording process state information in the node instrument original recording file during data extraction, thereby ensuring the validity of the extracted data.

[0038] The method for extracting active source seismic data collected by the cable-free node instrument utilizes the established combination relationship of two primary and secondary index keywords to conveniently aggregate the extracted trace data into a common shot point gather and a common receiving point gather. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A flow chart of a specific embodiment 1 of the method for extracting active source seismic data collected by a cable-free node instrument of the present invention;

[0040] Figure 2 It is a schematic diagram of the excitation time list information obtained by applying the present invention in a specific embodiment 1;

[0041] Figure 3 It is a schematic diagram of SPS relationship file information obtained by applying the present invention in a specific embodiment 1;

[0042] Figure 4 It is a schematic diagram of the node instrument equipment list information obtained by applying the present invention in a specific embodiment 1;

[0043] Figure 5 It is a schematic diagram of the index file information of the activation receiving associated information obtained by applying the present invention in a specific embodiment 1, respectively using the single gun field file number and the node instrument equipment number as the primary and secondary index keywords;

[0044] Figure 6 It is a schematic diagram of a node instrument time continuous recording file locked when the primary index keyword single gun field file number and node instrument equipment number are used as primary and secondary index keywords respectively in a specific embodiment 1 of the present invention, and the primary index keyword single gun field file number is 30058;

[0045] Figure 7It is a schematic diagram of the common shot point gather data obtained by applying the present invention in a specific embodiment 1, respectively using the single shot field file number and the node instrument equipment number as the primary and secondary index keywords, and when the primary index keyword single shot field file number is 30058, the extracted data is formed;

[0046] Figure 8 It is a schematic diagram of shot gather records of multiple source excitation times extracted by using single shot field file number and node instrument equipment number as primary and secondary index keywords in a specific embodiment 2 of the present invention;

[0047] Fig. 9 It is a schematic diagram of the index file information of the activation receiving associated information obtained by applying the present invention in a specific embodiment 3, respectively using the node instrument equipment number and the single gun field file number as the primary and secondary index keywords;

[0048] Fig.10 It is a schematic diagram of a node instrument time continuous recording file locked when the node instrument equipment number and the single gun field file number are respectively used as the primary and secondary index keywords in a specific embodiment 3 of the present invention, and the primary index keyword node instrument equipment number is 612688;

[0049] Fig.11 This is a schematic diagram of the common reception point gather data extracted when the node instrument equipment number and the single-shot field file number are used as the primary and secondary index keywords respectively in a specific embodiment 3 of the present invention, and the primary index keyword node instrument equipment number is 612688. DETAILED DESCRIPTION

[0050] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations and / or combinations thereof.

[0052] The present invention discloses a method for extracting active source seismic data collected by a cableless node instrument. Based on the field collection source excitation time, SPS relationship file and cableless node instrument equipment information, an excitation reception related information index including the field file number, source excitation time and node instrument equipment number and other corresponding relationships is established. Based on the index information and the determined primary and secondary index keywords, the cableless node instrument equipment and its binary data file of continuous time recording are locked. According to the source excitation time and the recording duration of the data to be extracted, the collected data within the effective recording period of the active source excitation is located and extracted from the binary data file. The primary index keyword is looped based on the MPI parallel mode, and finally the output of all common shot point gathers or common receiving point gathers is realized.

[0053] The method for extracting active source seismic data collected by a cable-free node instrument of the present invention specifically includes the following steps:

[0054] In step 1, the source excitation time list, the original SPS relationship file, and the node instrument equipment information list are obtained; the source excitation time list file contains the field file number FFID (Field File Identification) of the single shot and the corresponding GPS (Global Position System) time of the excitation moment, and the time format is yyyy / MM / dd HH:mm:ss:SSS, where yyyy is year, MM is month, dd is day, HH is hour, mm is minute, ss is second, and SSS is millisecond. For example, 2019 / 12 / 20 14:23:05.897, where 2019 is year, 12 is month, 20 is day, 14 is hour, 23 is minute, 05 is second, and 897 is millisecond.

[0055] The original SPS relationship file contains at least the field file number, shot line number, excitation point number, start channel number, end channel number, receiving line number, start receiving point number, and end receiving point number information of a single shot.

[0056] The node instrument device list file includes the node instrument device number, the node instrument's receiving line number and the receiving point number.

[0057] In step 2, an SPS relationship file containing accurate source excitation time is established based on the source excitation time list and the original SPS relationship file;

[0058] According to the source excitation time list and the original SPS relationship file, an SPS relationship file containing the source excitation time is established to ensure that the accuracy of the source excitation time is accurate to milliseconds.

[0059] In step 3, the combination relationship between the primary index keyword and the secondary index keyword of the output gather is determined;

[0060] Two main and secondary index keyword combination relationships can be determined. One is a combination relationship in which the single-gun field file number is the main index keyword and the node instrument equipment number is the secondary index keyword. The other is a combination relationship in which the node instrument equipment number is the main index keyword and the single-gun field file number is the secondary index keyword.

[0061] In step 4, using the receiving point matching relationship between the SPS relationship file containing the precise source excitation time and the node instrument equipment information list, according to the determined primary and secondary index keyword combination, an excitation receiving association information index file containing the mutual correspondence between the single shot field file number, the source excitation time and the node instrument equipment number is established;

[0062] When the primary and secondary index keywords are the single-shot field file number and the node instrument equipment number respectively, according to the combination of the receiving line number and the starting and ending receiving point number contained in the SPS relationship file containing the source excitation time, the belonging receiving line number and the receiving point number combination and the corresponding node instrument equipment number are extracted from the node instrument equipment list file to establish the corresponding excitation and reception association information index file.

[0063] When the primary and secondary index keywords are the node instrument equipment number and the single-shot field file number, respectively, according to the node instrument belonging receiving line number and receiving point number contained in the node instrument equipment list file, all single-shot field file numbers and their shot line numbers, excitation point numbers, starting channel numbers, ending channel numbers, source excitation time and other information corresponding to the combination of the node instrument belonging receiving line number and receiving point number are extracted from the SPS relationship file containing the precise source excitation time to establish a corresponding excitation-reception association information index file.

[0064] In step 5, according to the node instrument device number and its corresponding source excitation time contained in the excitation reception associated information index file, the node instrument device record file directory is located from the storage medium, and the time continuous record file of the corresponding moment is queried and locked;

[0065] According to the node instrument device number contained in the current index information in the excitation reception associated information index file, and the year, month, and day information in the source excitation time, query whether there is a binary file with continuous time records corresponding to the hourly moment of the source excitation time in the file directory with the node instrument device number string as the first-level file directory and the string constructed by the year, month, and day of the source excitation time as the second-level file directory. For example, if the node instrument device number is 612688 and its corresponding source excitation time is 2019 / 12 / 2014:23:05.897, then query whether the file . / 612688 / 20191220 / 14_1000.BIN exists. When the file exists, the current index information is valid. Otherwise, it is invalid and enters the next index information.

[0066] When the binary file of continuous time recording corresponding to the hourly moment of the source excitation moment exists, the initialization information of the node instrument equipment and the full-time recording status information are checked from the file header information of the file to see if they are normal. If all the verification feedback information is normal, the current index information is valid. Otherwise, it is invalid and the next index information is entered.

[0067] In step 6, according to the source excitation time and the duration of the trace data to be extracted, the starting and ending storage positions of the effective acquisition data in the locked time continuous record file are located to complete the trace data extraction;

[0068] Based on the characteristics of the node instrument output data as continuous time recording and equal sampling interval, the earthquake source excitation time and the time after the hour in the current binary data file starting recording time are converted and accumulated into milliseconds. If the time after the hour in the excitation time is HH hours, mm minutes, ss seconds, SSS milliseconds, the calculation formula for the earthquake source excitation time tbTime in milliseconds is,

[0069] tbTime=(HH*60*60+mm*60+ss)*1000+SSS

[0070] The calculation formula for the start recording time recordClock of the current binary file in milliseconds is:

[0071] recordClock=HH*60*60*1000

[0072] Use the following formula to calculate the file pointer position where the starting position of the seismic data to be extracted is located:

[0073] rec_str=(tbTime-recordClock) / sampInt

[0074] The file pointer position where the end position of the seismic data of the recorded duration to be extracted is:

[0075] rec_end=rec_str+(sampLen / sampInt)-1

[0076] Among them, tbTime is the source excitation time in milliseconds, recordClock is the start recording time of the current binary file in milliseconds, sampInt is the data sampling interval in milliseconds, and sampLen is the recording duration of the data to be extracted in milliseconds.

[0077] In step 7, the extraction of all seismic trace data is completed and the seismic data gather is formed;

[0078] When the single-shot field file number is used as the main index keyword, the extraction of the effective period trace data of the corresponding active source excitation in all the node instruments associated with the single field file number is realized, and the common shot point gather record data is formed.

[0079] When the node instrument equipment number is the main index keyword, the trace data within the effective period of active source excitation corresponding to all the associated single-shot field file numbers of a single node instrument equipment are extracted and aggregated to form the common receiving point trace data.

[0080] In step 8, steps 5 to 7 are looped to complete the extraction of all gathers corresponding to the primary index keyword values.

[0081] In the process of looping the primary index keyword value, MPI (Message Passing Interface) is used to implement multi-process parallel computing among multiple computing nodes. Each computing process completes the extraction of the corresponding channel data of a single primary index keyword value, thereby efficiently realizing the extraction and output of all channel records.

[0082] The method for extracting active source seismic data collected by a cableless node instrument of the present invention integrates the field collection source excitation time list, the SPS relationship file and the excitation reception basic information contained in the cableless node instrument equipment list, and can simultaneously establish an excitation reception associated information index file with the field file number and the node instrument equipment number as the primary and secondary keywords, and an excitation reception associated information index file with the node instrument equipment number and the field file number as the primary and secondary keywords. The established index file contains the mutual correspondence between the excitation and reception information such as the field file number of the source, the source excitation time, the shot line number, the excitation point number, the starting channel number, the ending channel number, the receiving line number, the starting receiving point number, the ending receiving point number information, the node instrument equipment number, the node instrument belonging receiving line number and the receiving point number.

[0083] In a specific embodiment 1 of the present invention, Figure 1 As shown, Figure 1 The flowchart of the method for extracting active source seismic data collected by the cable-free node instrument of the present invention. The method for extracting active source seismic data collected by the cable-free node instrument includes the following steps:

[0084] In step 101, firstly, basic information files such as a list of earthquake source excitation time collected in the field, an original SPS relationship file, and a list of node instrument equipment information are obtained;

[0085] The source excitation time list file contains the field file number FFID (Field File Identification) of the source single shot and its corresponding GPS (Global Position System) time of the excitation moment. The time format is yyyy / MM / dd HH:mm:ss:SSS, where yyyy is year, MM is month, dd is day, HH is hour, mm is minute, ss is second, and SSS is millisecond. Figure 2 As shown in , the excitation time of the single-gun field file number 30058 is 2019 / 12 / 20 14:14:33.993, where 2019 is the year, 12 is the month, 20 is the day, the first 14 is the hour, the second 14 is the minute, 33 is the second, and 993 is the millisecond.

[0086] As attached Figure 3 As shown in , the original SPS relationship file should at least contain the field file number, shot line number, excitation point number, start channel number, end channel number, receiving line number, start receiving point number, and end receiving point number information of a single shot.

[0087] As attached Figure 4 As shown in , the node instrument device list file should at least include the node instrument device number, the node instrument's receiving line number and the receiving point number.

[0088] In step 102, based on the source excitation time list and the original SPS relationship file obtained in step 101, an SPS relationship file containing precise source excitation time is established, and the accuracy of the source excitation time is ensured to milliseconds.

[0089] In step 103, it is determined that the single-shot field file number is the primary index keyword and the node instrument equipment number is the secondary index keyword to output the gather.

[0090] In step 104, using the receiving point matching relationship between the SPS relationship file containing the precise source excitation time and the node instrument equipment information list, according to the determined primary and secondary index keyword combination, an excitation receiving association information index file containing the mutual correspondence between the single shot field file number, the source excitation time and the node instrument equipment number is established;

[0091] When the primary and secondary index keywords are the single-shot field file number and the node instrument equipment number, respectively, according to the combination of the receiving line number and the start and end receiving point number contained in the SPS relationship file containing the source excitation time, extract the node instrument equipment numbers that are consistent with the combination of the belonging receiving line number and the belonging receiving point number from the node instrument equipment list file, and establish the excitation and reception related information index file with the single-shot field file number as the primary index keyword and the node instrument equipment number as the secondary index keyword. Figure 5The figure shows the excitation-reception correlation information index diagram for a single gun field file numbered 30058.

[0092] In step 105, according to the node instrument device number and its corresponding source excitation time contained in the excitation reception associated information index file, the node instrument device record file directory is located from the storage medium, and the time continuous record file of the corresponding moment is queried and locked;

[0093] According to the node instrument device number contained in the current index information in the excitation reception associated information index file, and the year, month, and day information of the source excitation time, query whether there is a binary file with continuous time records corresponding to the hourly moment of the source excitation time in the file directory with the node instrument device number string as the first-level file directory and the string constructed by the year, month, and day of the source excitation time as the second-level file directory. For example, as shown in the attached Figure 5 For the single shot with the field file number 30058 shown in the figure, take the node instrument device number 617869 associated with it in the relationship index file as an example, the corresponding source excitation time is 2019 / 12 / 2014:14:33.993. According to the excitation time, the node instrument record file storage directory and its corresponding data file . / 617869 / 20191220 / 14_1000.BIN to be queried exist. When the file exists, the current index information is valid. Otherwise, it is invalid and the next index information is entered. As shown in the attached Figure 6 As shown, this is a schematic diagram of some associated node instrument equipment numbers when the field file number is 30058, and the associated data that needs to be queried and locked.

[0094] When the binary file corresponding to the hourly moment of the source excitation time exists, the initialization information of the node instrument equipment and the full-time recording status information in the file header information of the file are checked to see if they are normal. If all the verification feedback information is normal, the current index information is valid. Otherwise, it is invalid and the next index information is entered.

[0095] In step 106, according to the source excitation time and the recording duration of the data to be extracted, the starting and ending storage positions of the active source seismic data in the locked time continuous recording file are located, and the acquisition data within the recording duration is extracted;

[0096] According to the characteristics of the node instrument data collection as continuous time recording and equal sampling interval, the earthquake source excitation time and the time after the hour in the current binary data file starting recording time are converted and accumulated into milliseconds. If the time after the hour in the excitation time is HH hours, mm minutes, ss seconds, SSS milliseconds, the calculation formula of the earthquake source excitation time tbTime in milliseconds is,

[0097] tbTime=(HH*60*60+mm*60+ss)*1000+SSS

[0098] The calculation formula for the start recording time recordClock of the current binary file in milliseconds is:

[0099] recordClock=HH*60*60*1000

[0100] Use the following formula to calculate the file pointer position where the starting position of the seismic data to be extracted is located:

[0101] rec_str=(tbTime-recordClock) / sampInt

[0102] The file pointer position where the end position of the seismic data of the recorded duration to be extracted is:

[0103] rec_end=rec_str+(sampLen / sampInt)-1

[0104] Among them, tbTime is the source excitation time in milliseconds, recordClock is the start recording time of the current binary file in milliseconds, sampInt is the data sampling interval in milliseconds, and sampLen is the recording duration of the data to be extracted in milliseconds.

[0105] In step 107, all seismic trace data corresponding to the same primary index keyword value are extracted and assembled to form a seismic data gather;

[0106] When the single-shot field file number is used as the main index keyword, it is possible to extract the corresponding valid time period trace data in all the node instruments associated with the single field file number and form the common shot point trace data. Figure 7 As shown, it is a common shot point gather formed by the collection of all trace data of a single shot field file number 30058.

[0107] In step 108, steps 105 to 107 are looped to complete the extraction of all gathers corresponding to the primary index keyword value. Moreover, in the process of looping the primary index keyword value, MPI (Message Passing Interface) is used to implement multi-process parallel computing among multiple computing nodes, and each computing process completes the extraction of gather data corresponding to a single primary index keyword value, thereby efficiently realizing the extraction and output of all gather records.

[0108] In specific embodiment 2 of the present invention, according to the relational index file established in embodiment 1 with the single-shot field file number and the node instrument equipment number as the primary and secondary index keywords, the single-shot field file numbers therein are cycled in turn, and finally a single-shot gather record consistent with the conventional cable seismic acquisition data recording format is formed.

[0109] As attached Figure 8 As shown in the figure, it is a schematic diagram of multiple shot gather data extracted and assembled with single shot field file number as the main index keyword. It can be seen that the underground reflection event axis recorded by the shot gather has clear hyperbolic characteristics, and the surface wave interference distribution range and energy law are reasonable, which meets the data format requirements of existing seismic processing software and meets the needs of data quality monitoring of seismic acquisition site and indoor seismic data processing.

[0110] In specific embodiment 3 of the present invention, different from specific embodiment 1, this embodiment first establishes a relational index with the node instrument equipment number as the main index keyword and the single-shot field file number as the secondary index keyword, then locates the node instrument full-time recording binary file, and extracts the seismic acquisition data excited by the active source, and finally forms the track gather data of the common receiving point.

[0111] When the primary and secondary index keywords are the node instrument equipment number and the single-shot field file number, firstly, according to the node instrument belonging receiving line number and belonging receiving point number contained in the node instrument equipment list file, extract all the single-shot field file numbers and their shot line numbers, excitation point numbers, starting channel numbers, ending channel numbers, source excitation time and other information corresponding to the node instrument belonging receiving line number and receiving point number combination from the SPS relationship file containing the precise source excitation time, and finally establish the excitation receiving related information index file with the node instrument equipment number as the primary index keyword and the single-shot field file number as the secondary index keyword. As shown in the attached figure Fig. 9 As shown, it is a schematic diagram of the relational index file consisting of the main index keyword of the node instrument equipment number 612688 and its corresponding different single-gun field file numbers.

[0112] According to the node instrument equipment number in the excitation reception related information index file and the year, month and day information of different source excitation times, query whether there is a binary file with continuous time records corresponding to the hourly moment of the source excitation time in the file directory with the node instrument equipment number string as the first-level file directory and the string constructed by the year, month and day of the source excitation time as the second-level file directory. For example, as shown in the attached Fig. 9 Take the index of the node instrument device number 612688 and the associated single-shot field file number 30031 as an example. The corresponding source excitation time is 2019 / 12 / 20 13:56:49.225. Check whether the node instrument record file storage directory and its corresponding data file 612688 / 20191220 / 13_1000.BIN to be queried based on the excitation time exist. If the file exists, the current index information is valid. Otherwise, it is invalid and the next index information is entered. Fig.10 As shown, this is a schematic diagram of some associated single-gun field file numbers when the node instrument device number is 612688, and the associated data that needs to be queried and locked.

[0113] As attached Fig.11 As shown, when the node instrument equipment number 612688 is the main index keyword, the active source excitation effective period corresponding to all the single-shot field file numbers associated with the node instrument equipment is extracted, and finally the common receiving point gather data is formed.

[0114] It can be predicted and confirmed in practice that when extracting active source seismic data from a cable-free node instrument under the same excitation and receiving scale, outputting common receiving point gathers is more convenient and efficient than outputting common shot point gathers.

[0115] The method for extracting active source seismic data collected by cableless node instrument is based on the field collection source excitation time, SPS relationship data and cableless node instrument equipment information, and establishes an excitation-reception related information index file containing the corresponding relationship between single-shot field file number, source excitation time and node instrument equipment number. The binary record file of the cableless node instrument equipment is locked according to the index information, and the seismic acquisition data within the effective period of active source excitation is located and extracted from it, and the common shot point gather or common receiving point gather output is realized in parallel.

[0116] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0117] Except for the technical features described in the specification, all other technical features are known technologies to those skilled in the art.

Claims

1. A method for extracting active source seismic data collected by a cable-free node instrument, characterized in that: The method for extracting active source seismic data collected by the cable-free node instrument includes: Step 1, obtain the source excitation time list, the original SPS relationship file and the node instrument equipment information list; Step 2, establishing an SPS relationship file containing precise source excitation time; Step 3, determining the combination relationship between the primary index keyword and the secondary index keyword of the output gather; Step 4, creating an excitation receiving associated information index file; Step 5, query and lock the time continuous record file of the corresponding moment; Step 6, extracting data; Step 7, complete the extraction of all seismic trace data and form a seismic data gather; Step 8, looping through steps 5 to 7 to complete the extraction of all gathers corresponding to the primary index keyword values; In step 4, using the receiving point matching relationship between the SPS relationship file containing the precise source excitation time and the node instrument equipment information list, according to the determined primary and secondary index keyword combination, an excitation receiving association information index file containing the mutual correspondence between the single shot field file number, the source excitation time and the node instrument equipment number is established; When the primary and secondary index keywords are the single-shot field file number and the node instrument equipment number, respectively, according to the receiving line number and the combination of the start and end receiving point numbers contained in the SPS relationship file containing the source excitation time, the node instrument equipment number corresponding to the combination of the belonging receiving line number and the belonging receiving point number is extracted from the node instrument equipment list file to establish the corresponding excitation and reception association information index file; When the primary and secondary index keywords are the node instrument equipment number and the single-shot field file number respectively, according to the node instrument belonging receiving line number and belonging receiving point number contained in the node instrument equipment list file, all single-shot field file numbers and their shot line numbers, excitation point numbers, starting channel numbers, ending channel numbers, and source excitation time corresponding to the combination of the node instrument belonging receiving line number and belonging receiving point number are extracted from the SPS relationship file containing the precise source excitation time to establish a corresponding excitation-receiving associated information index file.

2. The method for extracting active source seismic data collected by a cable-free node instrument according to claim 1, characterized in that: In step 1, the source excitation time list file contains the field file number of the source single shot and the GPS time of its corresponding excitation moment, and ensures that the source excitation time accuracy is accurate to milliseconds; the node instrument equipment list file contains the node instrument equipment number, the node instrument belonging receiving line number and the receiving point number.

3. The method for extracting active source seismic data collected by a cable-free node instrument according to claim 1, characterized in that: In step 3, two combinations of primary and secondary index keywords are determined; one is a combination of node instrument equipment number as the primary index keyword and single gun field file number as the secondary index keyword; the other is a combination of single gun field file number as the primary index keyword and node instrument equipment number as the secondary index keyword.

4. The method for extracting active source seismic data collected by a cable-free node instrument according to claim 1, characterized in that: In step 5, according to the node instrument device number and its corresponding source excitation time contained in the excitation reception associated information index file, the node instrument device record file directory is located from the storage medium, and it is checked whether there is a binary file of continuous time record corresponding to the source excitation moment in the directory; When the queried binary file exists, the initialization information of the node instrument device and the full-time recording status information are checked from the file header information of the file to see whether they are normal; When all verification feedback information is normal, the current index information is valid; When the queried file does not exist or the verification feedback information is abnormal, proceed to the next index information.

5. The method for extracting active source seismic data collected by a cable-free node instrument according to claim 1, characterized in that: In step 6, according to the source excitation time, the duration of the trace data to be extracted and the node instrument data recording sampling interval, the start and end storage positions of the effective acquisition data in the locked time continuous recording file are located to complete the trace data extraction.

6. The method for extracting active source seismic data collected by a cable-free node instrument according to claim 1, characterized in that: In step 7, when the single-shot field file number is used as the main index keyword, the corresponding valid time period trace data in all the node instruments associated with the single field file number are extracted to form the common shot point gather record data; When the node instrument equipment number is the main index keyword, the trace data within the effective period of active source excitation corresponding to all the associated single-shot field file numbers of a single node instrument equipment are extracted and aggregated to form the common receiving point trace data.

7. The method for extracting active source seismic data collected by a cable-free node instrument according to claim 1, characterized in that: In step 8, during the loop of the primary index keyword value, MPI is used to implement multi-process parallel computing among multiple computing nodes. Each computing process completes the extraction of the corresponding track data of a single primary index keyword value, thereby extracting and outputting all track records.

Images