Method and apparatus for correcting distributed fiber vertical seismic data

Abstract

This disclosure relates to a method and apparatus for correcting distributed fiber optic vertical seismic data. The method includes: acquiring distributed fiber optic vertical seismic data and well logging data of a target exploration area; obtaining a synthetic seismic record based on the well logging data; and correcting the corridor overlay data in the depth domain of the distributed fiber optic vertical seismic data based on the depth domain synthetic seismic record to obtain corrected fiber optic measurement depth information. The correction process includes: performing correction based on the relationship between the cross-correlation between the depth domain synthetic seismic record and the depth domain corridor overlay data and the corresponding depth correction amount. After depth correction of the distributed fiber optic vertical seismic data, the correlation between the depth domain corridor overlay data and the acoustic synthetic seismic record is significantly improved, demonstrating the effectiveness of the method and the accuracy of the depth-corrected data.

Description

Technical Field

[0001] This disclosure relates to the field of oil and gas exploration technology, and in particular to a method and apparatus for correcting distributed fiber optic vertical seismic data. Background Technology

[0002] Finding remaining oil and improving oil recovery rates are the main ways to increase production in old oil and gas fields in China. Conventional surface seismic exploration in old oilfields has undergone multiple rounds of exploration, from 2D, wide-line 2D, 3D, and even high-density 3D, but its resolution and accuracy are still insufficient to meet the needs of fine-grained oilfield development. Borehole seismic exploration is an important technology in development seismic exploration. Because its detectors are located in the well, closer to the target layer, it can reduce interference from near-surface and environmental factors. Its resolution is between well logging and surface seismic exploration, serving as a bridge between the two. Traditional techniques for obtaining vertical seismic profile (VSP) data require lowering multiple stages of detectors to the bottom of the well. However, conventional detectors have a limited number of stages and large spacing, typically 10-20m, resulting in high equipment costs and limitations in the temperature and pressure resistance of electronic components. Furthermore, construction and well control risks are high in high-temperature and high-pressure wells. Distributed fiber optic sensing technology, due to its advantages of high density, small channel spacing, one-time full-well section reception, temperature and pressure resistance, and high efficiency, is gradually becoming the next-generation technology for vertical seismic data measurement and is widely used both domestically and internationally.

[0003] In realizing the present invention, the inventors discovered at least the following technical problems in the related technology: In the process of seismic data measurement based on distributed optical fiber sensing technology, due to the influence of the actual deployment and engineering requirements of the distributed optical fiber, the information obtained by directly using the optical fiber detection will have a large error, which will reduce the accuracy of the interpretation of the seismic data. Summary of the Invention

[0004] To address, or at least partially address, the aforementioned technical problems, embodiments of this disclosure provide a method and apparatus for correcting distributed fiber optic vertical seismic data.

[0005] In a first aspect, embodiments of this disclosure provide a method for correcting distributed fiber optic vertical seismic data. The method includes: acquiring distributed fiber optic vertical seismic data and well logging data for a target exploration area; obtaining a synthetic seismic record based on the well logging data; and performing correction processing on corridor overlay data in the depth domain within the distributed fiber optic vertical seismic data based on the depth-domain synthetic seismic record to obtain corrected fiber optic measurement depth information; wherein the correction processing includes: performing correction based on the relationship between the cross-correlation degree between the depth-domain synthetic seismic record and the depth-domain corridor overlay data and the corresponding depth correction amount.

[0006] In some embodiments, based on the synthetic seismic records in the depth domain, the corridor stacked data in the depth domain of the aforementioned distributed fiber optic vertical seismic data are corrected to obtain corrected fiber optic measurement depth information. This includes: determining marker layers and corresponding depth window ranges for different depth levels for the synthetic seismic records and corridor stacked data in the depth domain; calculating the cross-correlation degree between the synthetic seismic records and corridor stacked data in the depth domain within the depth window range corresponding to the marker layers at each depth level; wherein the cross-correlation degree is a function related to the depth correction amount; determining the depth correction amount with the largest cross-correlation degree value within each depth level as the initial depth correction amount; performing depth fitting processing based on the initial depth correction amount to obtain the target correction amount corresponding to each depth within the entire well section; and correcting the fiber optic measurement depth in each distributed fiber optic vertical seismic data based on the target correction amount to obtain corrected fiber optic measurement depth information.

[0007] In some embodiments, depth fitting processing is performed based on the aforementioned initial depth correction amount to obtain the target correction amount corresponding to each depth within the entire well section, including: performing linear interpolation processing based on the corresponding initial depth correction amount within each depth level to obtain the target correction amount corresponding to each depth within the entire well section.

[0008] In some embodiments, the degree of cross-correlation described above is calculated using the following formula:

[0009]

[0010] Where corr(d) represents the degree of cross-correlation; N represents the total number of sampling points corresponding to all depths in the depth domain; d represents the depth correction amount, which takes the value [-dx·N / 2, dx·N / 2]; DVSP corr (i·dx) represents the corridor overlay data corresponding to depth i·dx in the depth domain; i represents the depth sequence number corresponding to each fiber measurement sampling point; dx represents the fiber spacing between fiber measurement sampling points; i·dx represents the nominal depth corresponding to the fiber measurement sampling point; mDVSP corr DVSP represents corridor overlay data at all depths. corr (i·dx) represents the mean; DSYN(i·dx-d) represents the synthetic seismic record corresponding to depth i·dx in the depth domain; i·dx-d is the true depth after removing the deformation caused by the stretching of the optical fiber; mDSYN represents the mean of DSYN(i·dx-d) corresponding to the synthetic seismic records of all depths.

[0011] In some embodiments, the aforementioned fiber optic measurement depth refers to the nominal depth corresponding to the fiber optic measurement sampling point. Correcting the fiber optic measurement depth in each distributed fiber optic vertical seismic dataset based on the aforementioned target correction amount to obtain corrected fiber optic measurement depth information includes: adding the fiber optic measurement depth in each distributed fiber optic vertical seismic dataset to the target correction amount at the corresponding location to obtain the corrected fiber optic measurement depth information.

[0012] In some embodiments, the distributed fiber-optic vertical seismic data is seismic data corresponding to zero well-source distance. The method further includes: determining the time-depth relationship based on the distributed fiber-optic vertical seismic data; and, based on the time-depth relationship, converting the synthetic seismic record and the time-domain corridor overlay data corresponding to the distributed fiber-optic vertical seismic data to obtain the depth-domain synthetic seismic record and the depth-domain corridor overlay data.

[0013] In some embodiments, obtaining a synthetic seismic record based on the above-mentioned well logging data includes: calculating the reflection coefficient based on velocity and density logging curves; performing convolution processing on the above-mentioned reflection coefficient and the extracted seismic wavelet to obtain an initial synthetic seismic record; and adjusting and correcting the initial synthetic seismic record based on the velocity field with acceptable accuracy and the well-pass seismic trace information to obtain a synthetic seismic record with acceptable accuracy.

[0014] Secondly, embodiments of this disclosure provide a correction device for distributed fiber optic vertical seismic data. The correction device includes: a data acquisition module, a synthetic seismic record generation module, and a depth correction module. The data acquisition module is used to acquire distributed fiber optic vertical seismic data and well logging data for a target exploration area. The synthetic seismic record generation module is used to generate a synthetic seismic record based on the well logging data. The depth correction module is used to perform correction processing on corridor overlay data in the depth domain of the distributed fiber optic vertical seismic data based on the synthetic seismic record in the depth domain, to obtain corrected fiber optic measurement depth information; wherein, the correction processing includes: performing correction based on the relationship between the cross-correlation degree between the synthetic seismic record in the depth domain and the corridor overlay data in the depth domain and the corresponding depth correction amount.

[0015] Thirdly, embodiments of this disclosure provide an electronic device. The electronic device includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, communication interface, and memory communicate with each other via the communication bus; the memory stores computer programs; and the processor, when executing the program stored in the memory, implements the distributed fiber-optic vertical seismic data correction method described above.

[0016] Fourthly, embodiments of this disclosure provide a computer-readable storage medium. The computer-readable storage medium stores a computer program that, when executed by a processor, implements the distributed fiber-optic vertical seismic data correction method as described above.

[0017] The technical solutions provided in the embodiments of this disclosure have at least some or all of the following advantages:

[0018] By utilizing the depth differences between distributed fiber optic vertical seismic data and synthetic seismic records derived from well logging data across multiple marker layers (such as shallow, intermediate, and deep marker layers), the cross-correlation in the depth domain is calculated. Since the synthetic seismic records obtained from well logging data represent relatively accurate true depths, while the true depths corresponding to fiber optic measurement sampling points in the corridor stacked data within the depth domain of the distributed fiber optic vertical seismic data have undergone stretching deformation from the nominal depths, the depth correction for marker layers at different depth levels can be obtained by calculating the cross-correlation based on the depth difference between the relatively accurate true depths and the nominal depths. This allows for the correction of the depth information in the distributed fiber optic vertical seismic data. After depth correction of the distributed fiber optic vertical seismic data, the correlation between the corridor stacked data in the depth domain and the synthetic seismic records is significantly improved, demonstrating the effectiveness of the method and the accuracy of the depth-corrected data. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0020] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0021] Figure 1 A flowchart illustrating a method for correcting distributed fiber-optic vertical seismic data according to an embodiment of the present disclosure is shown schematically.

[0022] Figure 2 A detailed implementation flowchart of step S130 according to an embodiment of the present disclosure is illustrated schematically;

[0023] Figure 3 A flowchart illustrating a method for correcting distributed fiber-optic vertical seismic data according to another embodiment of this disclosure is shown schematically.

[0024] Figure 4The diagram schematically illustrates (a1) synthetic seismic records and (b1) VSP corridor stacked data before depth correction in the depth domain according to an embodiment of the present disclosure, and (a2) synthetic seismic records and (b2) VSP corridor stacked data after depth correction in the depth domain.

[0025] Figure 5 A structural block diagram of a distributed fiber optic vertical seismic data correction device according to an embodiment of the present disclosure is shown schematically.

[0026] Figure 6 A schematic block diagram of an electronic device provided in an embodiment of the present disclosure is shown. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0028] Well-drilled distributed fiber optic sensing technology receives seismic wave signals by deploying optical cables inside, outside, or outside the casing or tubing. During development, it was discovered that in seismic data measurement based on distributed fiber optic sensing technology, the information obtained directly from fiber optic detection is subject to significant errors due to the influence of actual fiber optic deployment and engineering requirements, thus reducing the accuracy of seismic data interpretation.

[0029] Specifically, when optical cables are laid inside the casing, they are often affected by the actual layout and engineering aspects. For example, (1) the optical cable goes directly from the bottom of the well to the optical cable car, and the distance from the wellhead to the cable car needs to be determined; (2) there are no obvious markers in the well for depth correction; (3) in order to prevent the optical fiber from being pulled apart during the process of going down into the well, the length of the optical fiber is often greater than the length of the optical cable, which causes the optical fiber to be subjected to a strong tensile force, resulting in errors between the displayed measurement information and the actual depth information, thus affecting the interpretation of the final results.

[0030] Therefore, the following problems exist in the related technology: due to the influence of the fiber optic cable tension and the inaccurate calculation of the distance from the fiber optic cable at the wellhead to the cable car, there is an error between the fiber optic cable measurement depth and the actual formation depth, resulting in insufficient accuracy and precision of the interpretation results.

[0031] To address the aforementioned issues, embodiments of this disclosure provide a method and apparatus for correcting distributed fiber optic vertical seismic data. The method involves acquiring distributed fiber optic vertical seismic data and well logging data for a target exploration area; obtaining a synthetic seismic record based on the well logging data; and performing correction processing on the corridor overlay data in the depth domain within the distributed fiber optic vertical seismic data based on the depth-domain synthetic seismic record to obtain corrected fiber optic measurement depth information. The correction processing includes performing correction based on the relationship between the cross-correlation degree between the depth-domain synthetic seismic record and the depth-domain corridor overlay data and the corresponding depth correction amount.

[0032] By utilizing the depth differences between distributed fiber optic vertical seismic data and synthetic seismic records derived from well logging data across multiple marker layers (such as shallow, intermediate, and deep marker layers), the cross-correlation in the depth domain is calculated. Since the synthetic seismic records obtained from well logging data represent relatively accurate true depths, while the true depths corresponding to fiber optic measurement sampling points in the corridor stacked data within the depth domain of the distributed fiber optic vertical seismic data have undergone stretching deformation beyond the nominal depth, the depth correction for marker layers at different depth levels can be obtained by calculating the cross-correlation based on the depth difference between the relatively accurate true depth and the nominal depth. This allows for the correction of the depth information in the distributed fiber optic vertical seismic data. After depth correction of the distributed fiber optic vertical seismic data, the correlation between the corridor stacked data in the depth domain and the synthetic acoustic seismic records is significantly improved, verifying the effectiveness of the method and the accuracy of the depth-corrected data.

[0033] The first exemplary embodiment of this disclosure provides a method for correcting distributed fiber optic vertical seismic data.

[0034] Figure 1 A flowchart illustrating a method for correcting distributed fiber-optic vertical seismic data according to an embodiment of the present disclosure is shown.

[0035] Reference Figure 1 As shown, the method for correcting distributed fiber optic vertical seismic data provided in this embodiment includes the following steps: S110, S120 and S130.

[0036] In step S110, distributed fiber optic vertical seismic data and well logging data of the target exploration area are acquired.

[0037] In some embodiments, the aforementioned distributed fiber-optic vertical seismic data is time-domain vertical seismic profile (VSP) seismic data corresponding to zero well source distance; after a series of processing steps including first arrival picking, wavefield separation, dynamic correction, and corridor stacking, time-domain corridor stacked data (TVSP) corresponding to zero well source distance can be obtained. corridor .

[0038] VSP seismic data can accurately reflect the variation of seismic wave propagation velocity in the strata, and therefore time-depth relationships can be determined through VSP seismic data.

[0039] In step S120, a synthetic seismic record is obtained based on the above well logging data.

[0040] In some embodiments, step S120 above, obtaining a synthetic seismic record based on the well logging data, includes:

[0041] The reflection coefficient is calculated based on the velocity and density logging curves;

[0042] The above reflection coefficients are convolved with the extracted seismic wavelet to obtain the initial synthetic seismic record;

[0043] Based on the velocity field that meets the accuracy requirements and the well-passing seismic trace information, the initial synthetic seismic record is adjusted and corrected to obtain a synthetic seismic record that meets the accuracy requirements.

[0044] In step S130, based on the synthetic seismic record in the depth domain, the corridor overlay data in the depth domain of the above-mentioned distributed fiber vertical seismic data is corrected to obtain the corrected fiber measurement depth information; wherein, the above-mentioned correction process includes: correcting based on the relationship between the cross-correlation degree between the synthetic seismic record in the depth domain and the corridor overlay data in the depth domain and the corresponding depth correction amount.

[0045] The synthetic seismic record obtained from well logging data is a relatively accurate true depth. The true depth corresponding to the fiber measurement sampling point in the corridor superposition data in the depth domain of distributed fiber vertical seismic data is a stretched deformation based on the nominal depth. Therefore, by solving the cross-correlation degree based on the depth difference between the relatively accurate true depth and the nominal depth, the depth correction amount corresponding to the marker layer at different depth levels can be obtained.

[0046] Figure 2 A detailed implementation flowchart of step S130 according to an embodiment of the present disclosure is shown schematically.

[0047] In some embodiments, refer to Figure 2 As shown, in step S130 above, based on the synthetic seismic record in the depth domain, the corridor overlay data in the depth domain of the above distributed optical fiber vertical seismic data is corrected to obtain the corrected optical fiber measurement depth information, including the following steps: S210, S220, S230, S240 and S250.

[0048] In step S210, for the synthetic seismic records in the depth domain and the corridor overlay data in the depth domain, the marker layers and corresponding depth window ranges for different depth levels are determined.

[0049] The aforementioned marker layers are those with clearly defined boundaries and a resolution higher than the set value. The number of marker layers depends on the specific synthetic seismic record data, and generally more than two marker layers can be selected. For example, three marker layers, T1, T2, and T3, of shallow, intermediate, and deep depths can be extracted from synthetic seismic records in the depth domain, and the corresponding depth window ranges can be determined as D1, D2, and D3.

[0050] In step S220, within the depth window range corresponding to the marker layer at each depth level, the cross-correlation degree between the synthetic seismic record in the depth domain and the corridor stacked data in the depth domain is calculated; wherein the cross-correlation degree is a function related to the depth correction amount.

[0051] In some embodiments, the degree of cross-correlation described above is calculated using the following formula:

[0052]

[0053] Where corr(d) represents the degree of cross-correlation; N represents the total number of sampling points corresponding to all depths in the depth domain; d represents the depth correction amount, which takes the value [-dx·N / 2, dx·N / 2]; DVSP corr (i·dx) represents the corridor overlay data corresponding to depth i·dx in the depth domain; i represents the depth sequence number corresponding to each fiber measurement sampling point; dx represents the fiber spacing between fiber measurement sampling points; i·dx represents the nominal depth corresponding to the fiber measurement sampling point; mDVSP corr DVSP represents corridor overlay data at all depths. corr (i·dx) represents the mean; DSYN(i·dx-d) represents the synthetic seismic record corresponding to depth i·dx in the depth domain; i·dx-d is the true depth after removing the deformation caused by the stretching of the optical fiber; mDSYN represents the mean of DSYN(i·dx-d) corresponding to the synthetic seismic records of all depths.

[0054] In step S230, within each depth level, the depth correction value with the largest cross-correlation value is determined as the initial depth correction value.

[0055] In some embodiments, by solving the above formula (1), the depth correction amounts d1, d2, and d3 corresponding to the maximum cross-correlation value max{corr(d)} are obtained within each depth window range D1, D2, and D3, and are used as the initial depth correction amounts.

[0056] In step S240, depth fitting is performed based on the initial depth correction amount to obtain the target correction amount corresponding to each depth in the entire well section.

[0057] Depth fitting can employ various methods such as linear interpolation and polynomial fitting to ensure that the function distribution of the target correction amount within each depth window range can represent the correction amount within the entire well section corresponding to different depth values ​​and match the actual tensile characteristics of the optical fiber.

[0058] For example, in some embodiments, depth fitting processing is performed based on the above-mentioned initial depth correction amount to obtain the target correction amount corresponding to each depth in the whole well section, including: performing linear interpolation processing based on the corresponding initial depth correction amount in each depth level to obtain the target correction amount corresponding to each depth in the whole well section.

[0059] In step S250, the fiber optic measurement depth in each distributed fiber optic vertical seismic data is corrected based on the above target correction amount to obtain the corrected fiber optic measurement depth information.

[0060] In some embodiments, the aforementioned fiber optic measurement depth refers to the nominal depth corresponding to the fiber optic measurement sampling point. Correcting the fiber optic measurement depth in each distributed fiber optic vertical seismic dataset based on the aforementioned target correction amount to obtain corrected fiber optic measurement depth information includes: adding the fiber optic measurement depth in each distributed fiber optic vertical seismic dataset to the target correction amount at the corresponding location to obtain the corrected fiber optic measurement depth information.

[0061] In distributed fiber optic vertical seismic data, the actual depth corresponding to the fiber optic measurement sampling point in the corridor overlay data in the depth domain is the result of tensile deformation based on the nominal depth. Therefore, given the target correction amount, the actual depth corresponding to the fiber optic detection can be obtained based on the target correction amount corresponding to the nominal depth overlay, which is the corrected fiber optic measurement depth information.

[0062] In the embodiment including steps S110 to S130, the cross-correlation degree in the depth domain is solved by utilizing the depth difference between distributed fiber optic vertical seismic data and synthetic seismic records obtained from well logging data across multiple marker layers (such as shallow, intermediate, and deep marker layers). Since the synthetic seismic records obtained from well logging data represent relatively accurate true depths, the true depths corresponding to the fiber optic measurement sampling points in the corridor overlay data within the depth domain of the distributed fiber optic vertical seismic data are stretched and deformed from the nominal depths. Therefore, by solving for the cross-correlation degree based on the depth difference between the relatively accurate true depths and the nominal depths, the depth correction amounts corresponding to marker layers at different depth levels can be obtained; thus, the depth information of the distributed fiber optic vertical seismic data is corrected. After depth correction of the distributed fiber optic vertical seismic data, the correlation between the corridor overlay data in the depth domain and the acoustic synthetic seismic records in the distributed fiber optic vertical seismic data is significantly improved, demonstrating the effectiveness of the method and the accuracy of the data after depth correction.

[0063] Figure 3 A flowchart illustrating a method for correcting distributed fiber-optic vertical seismic data according to another embodiment of this disclosure is shown schematically.

[0064] Reference Figure 3 As shown, in some embodiments, in addition to steps S110 to S130, the above method also includes the following steps: S310 and S320. Step S310 is executed after step S110, and step S320 is executed after step S310.

[0065] In step S310, the time-depth relationship is determined based on the aforementioned distributed fiber optic vertical seismic data.

[0066] In step S320, based on the aforementioned time-depth relationship, the time-domain corridor overlay data corresponding to the aforementioned synthetic seismic records and the aforementioned distributed fiber optic vertical seismic data are respectively converted to obtain the depth-domain synthetic seismic records and the depth-domain corridor overlay data.

[0067] By setting steps S310 to S320, the conversion from time-domain data to depth-domain data is realized, which helps to perform depth correction on the corridor overlay data in the depth domain based on the synthetic seismic records in the depth domain.

[0068] Figure 4 The illustration schematically shows (a1) synthetic seismic records and (b1) VSP corridor stacked data before depth correction in the depth domain according to an embodiment of the present disclosure, and (a2) synthetic seismic records and (b2) VSP corridor stacked data after depth correction in the depth domain; for comparison Figure 4As can be seen from (a1) and (a2), (b1) and (b2), after depth correction of the distributed fiber optic vertical seismic data, the correlation between the corridor data and the acoustic synthesized seismic record is significantly improved, verifying the effectiveness of the correction method provided in this embodiment and the accuracy of the data after depth correction.

[0069] A second exemplary embodiment of this disclosure provides a correction apparatus for distributed fiber optic vertical seismic data.

[0070] Figure 5 A structural block diagram of a distributed fiber optic vertical seismic data correction device according to an embodiment of the present disclosure is shown schematically.

[0071] Reference Figure 5 As shown, the distributed fiber optic vertical seismic data correction device 500 provided in this embodiment includes: a data acquisition module 510, a synthetic seismic record generation module 520, and a depth correction module 530.

[0072] The aforementioned data acquisition module 510 is used to acquire distributed fiber-optic vertical seismic data and well logging data of the target exploration area.

[0073] The aforementioned synthetic seismic record generation module 520 is used to obtain synthetic seismic records based on the aforementioned well logging data.

[0074] The aforementioned depth correction module 530 is used to perform correction processing on the corridor stacked data in the depth domain of the aforementioned distributed fiber vertical seismic data based on the synthetic seismic record in the depth domain, to obtain the corrected fiber measurement depth information; wherein, the aforementioned correction processing includes: correcting the relationship between the cross-correlation degree between the synthetic seismic record in the depth domain and the corridor stacked data in the depth domain and the corresponding depth correction amount.

[0075] In some embodiments, the correction device 500 further includes a time-depth relationship determination module and a time-depth conversion module.

[0076] The aforementioned time-depth relationship determination module is used to determine the time-depth relationship based on the aforementioned distributed fiber optic vertical seismic data.

[0077] The aforementioned time-depth conversion module is used to convert the time-domain corridor overlay data corresponding to the aforementioned synthetic seismic records and the aforementioned distributed fiber optic vertical seismic data according to the aforementioned time-depth relationship, so as to obtain the depth-domain synthetic seismic records and the depth-domain corridor overlay data.

[0078] For more details or beneficial effects included in this embodiment, please refer to the relevant description of the first embodiment, which will not be repeated here.

[0079] Any plurality of the functional modules included in the aforementioned calibration device 500 may be combined into one module, or any one of the modules may be split into multiple modules. Alternatively, at least a portion of the functionality of one or more of these modules may be combined with at least a portion of the functionality of other modules and implemented in one module. At least one of the functional modules included in the calibration device 500 may be at least partially implemented as hardware circuitry, such as a field-programmable gate array (FPGA), a programmable logic array (PLA), a system-on-a-chip, a system-on-a-substrate, a system-on-package, an application-specific integrated circuit (ASIC), or any other reasonable means of integrating or packaging circuitry, or implemented in software, hardware, or firmware, or in any suitable combination of any of these three implementation methods. Alternatively, at least one of the functional modules included in the calibration device 500 may be at least partially implemented as a computer program module, which, when run, can perform corresponding functions.

[0080] A third exemplary embodiment of this disclosure provides an electronic device.

[0081] Figure 6 The schematic diagram illustrates a structural block diagram of an electronic device provided in an embodiment of the present disclosure.

[0082] Reference Figure 6 As shown, the electronic device 600 provided in this embodiment includes a processor 601, a communication interface 602, a memory 603, and a communication bus 604. The processor 601, the communication interface 602, and the memory 603 communicate with each other through the communication bus 604. The memory 603 is used to store computer programs. When the processor 601 executes the program stored in the memory, it implements the distributed fiber optic vertical seismic data correction method described above.

[0083] A fourth exemplary embodiment of this disclosure also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program that, when executed by a processor, implements the distributed fiber-optic vertical seismic data correction method as described above.

[0084] The computer-readable storage medium may be included in the device or apparatus described in the above embodiments; or it may exist independently and not assembled into the device or apparatus. The computer-readable storage medium carries one or more programs that, when executed, implement the method according to the embodiments of this disclosure.

[0085] According to embodiments of this disclosure, the computer-readable storage medium can be a non-volatile computer-readable storage medium, such as including, but not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this disclosure, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0086] It should be noted that the collection, gathering, updating, analysis, processing, use, transmission, and storage of user personal information involved in the technical solutions provided in this disclosure comply with the provisions of relevant laws and regulations, are used for legitimate purposes, and do not violate public order and good morals. Necessary measures are taken to prevent unauthorized access to user personal information data and to safeguard user personal information security, network security, and national security.

[0087] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0088] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for correcting distributed fiber optic vertical seismic data, characterized in that, include: Acquire distributed fiber-optic vertical seismic data and well logging data for the target exploration area; A synthetic seismic record was obtained based on the well logging data; Based on the synthetic seismic records in the depth domain, the corridor overlay data in the depth domain of the distributed fiber optic vertical seismic data is corrected to obtain corrected fiber optic measurement depth information; wherein, the correction process includes: correcting based on the relationship between the cross-correlation degree between the synthetic seismic records in the depth domain and the corridor overlay data in the depth domain and the corresponding depth correction amount.

2. The method according to claim 1, characterized in that, Based on the synthetic seismic records in the depth domain, the corridor overlay data in the depth domain of the distributed fiber optic vertical seismic data are corrected to obtain corrected fiber optic measurement depth information, including: For synthetic seismic records in the depth domain and corridor overlay data in the depth domain, we determine the marker layers and corresponding depth window ranges for different depth levels; Within the depth window corresponding to the marker layer at each depth level, the cross-correlation between the synthetic seismic record in the depth domain and the corridor stacked data in the depth domain is calculated; wherein the cross-correlation is a function related to the depth correction amount. Within each depth level, the depth correction value with the largest cross-correlation value is determined as the initial depth correction value; Based on the initial depth correction amount, depth fitting processing is performed to obtain the target correction amount corresponding to each depth in the entire well section; Based on the target correction amount, the fiber optic measurement depth in each distributed fiber optic vertical seismic data is corrected to obtain the corrected fiber optic measurement depth information.

3. The method according to claim 2, characterized in that, Based on the initial depth correction, depth fitting processing is performed to obtain the target correction for each depth within the entire well section, including: Within each depth level, linear interpolation is performed based on the corresponding initial depth correction to obtain the target correction for each depth within the entire well section.

4. The method according to claim 2, characterized in that, The degree of cross-correlation is calculated using the following formula: Where corr(d) represents the degree of cross-correlation; N represents the total number of sampling points corresponding to all depths in the depth domain; d represents the depth correction amount, which takes the value [-dx·N / 2, dx·N / 2]; DVSP corr (i·dx) represents the corridor overlay data corresponding to depth i·dx in the depth domain; i represents the depth sequence number corresponding to each fiber measurement sampling point; dx represents the fiber spacing between fiber measurement sampling points; i·dx represents the nominal depth corresponding to the fiber measurement sampling point; mDVSP corr DVSP represents corridor overlay data at all depths. corr (i·dx) represents the mean; DSYN(i·dx-d) represents the synthetic seismic record corresponding to depth i·dx in the depth domain; i·dx-d is the true depth after removing the deformation caused by the stretching of the optical fiber; mDSYN represents the mean of DSYN(i·dx-d) corresponding to the synthetic seismic records of all depths.

5. The method according to claim 4, characterized in that, The fiber optic measurement depth refers to the nominal depth corresponding to the fiber optic measurement sampling point; Based on the target correction amount, the fiber optic measurement depth in each distributed fiber optic vertical seismic data is corrected to obtain corrected fiber optic measurement depth information, including: The fiber optic measurement depth in each distributed fiber optic vertical seismic data set is added to the target correction value at the corresponding location to obtain the corrected fiber optic measurement depth information.

6. The method according to claim 1, characterized in that, The distributed fiber-optic vertical seismic data is the seismic data corresponding to zero well source distance; The method further includes: Based on the distributed fiber-optic vertical seismic data, the time-depth relationship is determined; Based on the time-depth relationship, the time-domain corridor overlay data corresponding to the synthetic seismic record and the distributed fiber optic vertical seismic data are converted and processed to obtain the depth-domain synthetic seismic record and the depth-domain corridor overlay data.

7. The method according to claim 1, characterized in that, A synthetic seismic record was obtained based on the well logging data, including: The reflection coefficient is calculated based on the velocity and density logging curves; The reflection coefficients are convolved with the extracted seismic wavelet to obtain the initial synthetic seismic record; Based on the velocity field that meets the accuracy requirements and the well-passing seismic trace information, the initial synthetic seismic record is adjusted and corrected to obtain a synthetic seismic record that meets the accuracy requirements.

8. A correction device for distributed fiber optic vertical seismic data, characterized in that, include: The data acquisition module is used to acquire distributed fiber-optic vertical seismic data and well logging data of the target exploration area; A synthetic seismic record generation module is used to generate synthetic seismic records based on the well logging data; A depth correction module is used to correct corridor overlay data in the depth domain of the distributed fiber optic vertical seismic data based on the synthetic seismic record in the depth domain, to obtain corrected fiber optic measurement depth information; wherein, the correction process includes: correcting based on the relationship between the cross-correlation degree between the synthetic seismic record in the depth domain and the corridor overlay data in the depth domain and the corresponding depth correction amount.

9. An electronic device, characterized in that, It includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, when executing a program stored in memory, implements the method of any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1-7.

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