Drilling rock core imaging method and device for near-surface structure

Abstract

The invention discloses a drilling rock core imaging method and device for a near-surface structure, and the method comprises the steps: placing the rock core imaging device in a drill hole after the cleaning of the drill hole of the near-surface structure is completed; acquiring a real-time image of the drill hole through the rock core imaging device, synchronously correcting the real-time image, and scanning line by line to obtain a panoramic histogram of the drill hole when a probe of the rock core imaging device is placed at the bottom of the drill hole; plugging the orifice and injecting water until the orifice is full, and performing ultrasonic measurement based on the rock core imaging device to obtain a measurement result; the ultrasonic speed is obtained based on the measurement result, the ultrasonic speed and the borehole panoramic histogram are fused into an imaging result to be output, the image and the ultrasonic speed of the near-surface structure can be obtained in real time through the rock core imaging device, the accuracy of near-surface structure investigation is improved, and the construction cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of near-surface structure measurement, and more specifically, to a borehole core imaging method and device for near-surface structures. Background Art

[0002] As one of the "double complexity" difficulties, complex near-surface conditions have a severe impact on obtaining high-quality data in seismic exploration. It is of great significance for seismic acquisition and processing to implement the near-surface structure problem in complex areas by developing high-density and high-precision near-surface structure survey methods.

[0003] In the early stage, there are various types of near-surface structure survey technical methods, but their adaptability to different regions is relatively single. Core logging refers to measuring, calculating, and positioning the cores taken from the drill hole, and further completing lithological description photography and compiling core histograms, etc., which can reflect the surface structure at that point. However, core logging is cumbersome in construction, difficult in data backtracking, low in automation, and not high in accuracy. It is necessary to ensure the selection of appropriate core drilling rigs and technologies to ensure the integrity of the cores to the greatest extent. At the same time, it also requires logging personnel to make core descriptions within 24 hours, such as color, lithology (including particle size), preservation, cementation, hardness, etc., to analyze sedimentary characteristics, draw lithological histograms, and fill in logging records, etc. This results in cumbersome construction, difficult data backtracking, and low accuracy in traditional core logging.

[0004] Therefore, there is an urgent need for a better solution. Summary of the Invention

[0005] The present invention provides a borehole core imaging method and device for near-surface structures, which are applied to a borehole core imaging system including a core imaging device, to solve the technical problems of high construction difficulty, high construction cost, and low accuracy rate in the prior art when investigating near-surface structures. The method includes:

[0006] After completing the cleaning of the borehole in the near-surface structure, place the core imaging device into the borehole;

[0007] Collect real-time images of the borehole through the core imaging device, perform synchronous correction processing on the real-time images, and when the probe of the core imaging device is placed at the bottom of the borehole, scan line by line to obtain a panoramic borehole histogram;

[0008] Seal the hole opening and fill the hole with water until it is full, and perform ultrasonic measurement based on the core imaging device to obtain a measurement result;

[0009] Obtain the ultrasonic velocity based on the measurement result, and fuse the ultrasonic velocity with the panoramic borehole histogram to form an imaging result and output it.

[0010] In some of the specific embodiments, the core imaging device includes a gyroscope, a first receiving probe, a second receiving probe, a panoramic camera, a transmitting probe, a first filtering cushion layer, a second filtering cushion layer, a third filtering cushion layer, and a customized glass cover.

[0011] The gyroscope is disposed at the bottom of the core imaging device. The second receiving probe is disposed between the second end of the gyroscope and the first end of the third filtering cushion layer. The first receiving probe is disposed between the second end of the third filtering cushion layer and the first end of the second filtering cushion layer. The transmitting probe is disposed between the second end of the second filtering cushion layer and the first end of the first filtering cushion layer. The panoramic camera is disposed at the head of the core imaging device, and the first end of the panoramic camera is connected to the second end of the first filtering cushion layer, and the customized glass cover is disposed at the panoramic camera to protect the panoramic camera.

[0012] In some of the specific embodiments, the real-time image of the borehole is collected by the core imaging device, and the real-time image is synchronously corrected. When the probe of the core imaging device is placed at the bottom of the borehole, a panoramic columnar diagram of the borehole is obtained by line-by-line scanning. Specifically:

[0013] The real-time image of the borehole is collected by the panoramic camera of the core imaging device.

[0014] The pose information of the core imaging device is obtained based on the gyroscope, and a pose information storage table is constructed based on the pose information. The pose information includes a direction angle and an inclination angle, and the pose information storage table at least further includes a count value.

[0015] The real-time image is synchronously corrected based on the image automatic correction formula and the pose information.

[0016] The synchronously corrected real-time images are stitched line by line according to the count value to obtain a panoramic columnar diagram of the borehole, and the borehole depth and the azimuth angle are marked on the panoramic columnar diagram of the borehole.

[0017] In some of the specific embodiments, the image automatic correction formula includes an x-direction correction formula, a y-direction correction formula, and a z-direction correction formula, where x', y', and z' are the new coordinates after rotation, and θ x , θ y , θ z are the rotation angles in the x, y, and z directions respectively:

[0018] The specific x-direction correction formula is:

[0019] The specific y-direction correction formula is:

[0020] The Z-direction correction formula is specifically as follows:

[0021] In some specific embodiments, the orifice is blocked and water is injected until the hole is full, and ultrasonic measurement is performed based on the core imaging device to obtain a measurement result, specifically:

[0022] After blocking the orifice and injecting water until the hole is full, the core imaging device is lifted at a predetermined speed, and ultrasonic waves are emitted through the transmitting probe;

[0023] The waveform diagram of the ultrasonic wave is collected at a predetermined frequency;

[0024] Based on the waveform diagram, a first time and a second time are obtained, and the first time and the second time are used as the measurement result. The first time is the time when the ultrasonic wave reaches the first receiving probe from the transmitting probe, and the second time is the time when the ultrasonic wave reaches the second receiving probe from the transmitting probe.

[0025] In some specific embodiments, the ultrasonic wave velocity is obtained based on the measurement result, specifically:

[0026] The first time and the second time are used as input values, and the ultrasonic wave velocity is obtained through a first formula;

[0027] Among them, the first formula is specifically:

[0028]

[0029] Among them, v is the ultrasonic wave velocity, t 1 is the first time; t 2 is the second time; L 1 is the distance between the transmitting probe and the first receiving probe; L 2 is the distance between the transmitting probe and the second receiving probe.

[0030] Correspondingly, the present invention also provides a borehole core imaging device for near-surface structures, and the device includes:

[0031] A placement module, configured to place the core imaging device in the borehole after the borehole cleaning of the near-surface structure is completed;

[0032] A synchronous correction module, configured to collect real-time images of the borehole through the core imaging device, perform synchronous correction processing on the real-time images, and obtain a panoramic columnar diagram of the borehole by scanning line by line when the probe of the core imaging device is placed at the bottom of the borehole;

[0033] A measurement module, configured to seal the orifice and inject water until the hole is full, and perform ultrasonic measurement based on the core imaging device to obtain a measurement result;

[0034] An output module, configured to obtain an ultrasonic velocity based on the measurement result, and fuse the ultrasonic velocity with the borehole panoramic histogram to form an imaging result and output it.

[0035] One embodiment of the present invention further provides a computing device, including: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions, and when the computer-executable instructions are executed by the processor, the steps of the borehole core imaging method for near-surface structures described above are implemented.

[0036] One embodiment of the present invention further provides a computer-readable storage medium, which stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the steps of the borehole core imaging method for near-surface structures described above are implemented.

[0037] By applying the above technical solutions, a borehole core imaging method for near-surface structures is proposed. The method includes: after completing the borehole cleaning of the near-surface structure, placing the core imaging device in the borehole; collecting real-time images of the borehole through the core imaging device, performing synchronous correction processing on the real-time images, and when the probe of the core imaging device is placed at the bottom of the borehole, scanning line by line to obtain a borehole panoramic histogram; sealing the orifice and injecting water until the hole is full, performing ultrasonic measurement based on the core imaging device to obtain a measurement result; obtaining an ultrasonic velocity based on the measurement result, and fusing the ultrasonic velocity with the borehole panoramic histogram to form an imaging result and output it. Through the core imaging device, the image and ultrasonic velocity of the near-surface structure can be obtained in real time, improving the accuracy of the near-surface structure survey and reducing the construction cost. Description of the Drawings

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0039] Figure 1 is a flowchart of a borehole core imaging method for near-surface structures provided by an embodiment of the present application;

[0040] Figure 2 is a schematic structural diagram of a core imaging device provided by an embodiment of the present application;

[0041] Figure 3 It is a schematic structural diagram of the borehole core imaging system provided by an embodiment of the present application;

[0042] Figure 4 It is a schematic diagram of the real-time image provided by an embodiment of the present application;

[0043] Figure 5 It is a schematic diagram of the pose information storage table provided by an embodiment of the present application;

[0044] Figure 6 It is a schematic diagram of the borehole panoramic histogram provided by an embodiment of the present application;

[0045] Figure 7 It is a schematic diagram of the waveform diagram provided by an embodiment of the present application;

[0046] Figure 8 It is a schematic diagram of the imaging result provided by an embodiment of the present application;

[0047] Figure 9 It is a schematic structural diagram of a borehole core imaging device for near-surface structures provided by an embodiment of the present application;

[0048] Figure 10 It is a schematic block diagram of a computing device provided by an embodiment of the present application. Detailed implementation manners

[0049] In the following description, many specific details are set forth in order to provide a thorough understanding of this specification. However, this specification can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the connotation of this specification. Therefore, this specification is not limited by the specific implementations disclosed below.

[0050] The terms used in one or more embodiments of this specification are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of this specification. The singular forms "a" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more of the associated listed items.

[0051] It should be understood that although the terms first, second, etc. may be used in one or more embodiments of this specification to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to a determination".

[0052] As Figure 1 shown, the present application proposes a method for imaging drill cores of a near-surface structure, and the method includes the following steps:

[0053] Step S101, after completing the drilling cleaning of the near-surface structure, place the core imaging device in the drill hole.

[0054] In a possible implementation, the core imaging device includes a gyroscope, a first receiving probe, a second receiving probe, a panoramic camera, a transmitting probe, a first filtering cushion layer, a second filtering cushion layer, a third filtering cushion layer, and a customized glass cover.

[0055] The gyroscope is arranged at the bottom of the core imaging device, the second receiving probe is arranged between the second end of the gyroscope and the first end of the third filtering cushion layer, the first receiving probe is arranged between the second end of the third filtering cushion layer and the first end of the second filtering cushion layer, the transmitting probe is arranged between the second end of the second filtering cushion layer and the first end of the first filtering cushion layer, the panoramic camera is arranged at the head of the core imaging device, and the first end of the panoramic camera is connected to the second end of the first filtering cushion layer, and the customized glass cover is arranged at the panoramic camera to protect the panoramic camera.

[0056] In this embodiment, as Figure 2 shown is a schematic structural diagram of a core imaging device provided in this embodiment. Among them, the transmitting probe, the first receiving probe, and the second receiving probe are specifically used for the ultrasonic wave velocity of the subsequent rock mass, and the panoramic camera is used to collect real-time images in the drill hole. In order to protect the panoramic camera, a customized glass cover is arranged at the top of the panoramic camera to prevent the panoramic camera from being damaged or affected by water ingress and affecting normal operation. The gyroscope is mainly used to determine the position information of the core imaging device, so as to facilitate subsequent correction of the real-time images collected by the core imaging device.

[0057] Step S102, collect real-time images of the drill hole through the core imaging device, perform synchronous correction processing on the real-time images, and when the probe of the core imaging device is placed at the bottom of the drill hole, scan line by line to obtain a panoramic columnar diagram of the drill hole.

[0058] In a possible implementation, real-time images of the borehole are collected by the core imaging device, and the real-time images are synchronously corrected. When the probe of the core imaging device is placed at the bottom of the borehole, a panoramic columnar diagram of the borehole is obtained by line-by-line scanning. Specifically:

[0059] Collect real-time images of the borehole through the panoramic camera of the core imaging device;

[0060] Obtain the pose information of the core imaging device based on the gyroscope, and construct a pose information storage table based on the pose information. The pose information includes the direction angle and the inclination angle, and the pose information storage table at least further includes a count value;

[0061] Synchronously correct the real-time images based on the image automatic correction formula and the pose information;

[0062] Stitch the synchronously corrected real-time images line by line according to the count value to obtain a panoramic columnar diagram of the borehole, and mark the borehole depth and the azimuth angle on the panoramic columnar diagram of the borehole.

[0063] In this embodiment, the acquisition of real-time images is completed by a panoramic camera. The real-time images are as Figure 4 shown. And when collecting real-time images through the panoramic camera, the pose information of the core imaging device is obtained through the gyroscope. The pose information is used to represent or reflect the position and attitude of the core imaging device. Further, the pose information is saved in the form of a pose information storage table. Among them, in addition to the direction angle and the inclination angle, the table also includes a count value. The specific form of the pose information storage table is as Figure 5 shown.

[0064] In this embodiment, the real-time images are synchronously corrected through the image automatic correction formula and the pose information so that the real-time images meet the expectations. The collected real-time images are stitched line by line according to the count value to stitch out a panoramic columnar diagram of the borehole. The specific form is as Figure 6 shown.

[0065] In a possible implementation, the image automatic correction formula includes an x-direction correction formula, a y-direction correction formula, and a z-direction correction formula, where x', y', and z' are the new coordinates after rotation, and θ x , θ y , θ z are the rotation angles in the x, y, and z directions respectively:

[0066] The specific x-direction correction formula is:

[0067] The specific Y-direction correction formula is as follows:

[0068] The specific Z-direction correction formula is as follows:

[0069] In this embodiment, the real-time image is synchronously corrected by correcting the X-direction, Y-direction, and Z-direction respectively, and the correction formulas in each direction are as described above.

[0070] Step S103: Plug the orifice and fill it with water until it is full, and perform ultrasonic measurement based on the core imaging device to obtain a measurement result.

[0071] In a possible implementation, plugging the orifice and filling it with water until it is full, and performing ultrasonic measurement based on the core imaging device to obtain a measurement result, specifically:

[0072] After plugging the orifice and filling it with water until it is full, lift the core imaging device at a predetermined speed, and emit ultrasonic waves through the transmitting probe;

[0073] Collect the waveform diagram of the ultrasonic wave at a predetermined frequency;

[0074] Obtain a first time and a second time based on the waveform diagram, and use the first time and the second time as the measurement result. The first time is the time when the ultrasonic wave reaches the first receiving probe from the transmitting probe, and the second time is the time when the ultrasonic wave reaches the second receiving probe from the transmitting probe.

[0075] In this embodiment, after plugging the orifice and filling it with water until it is full, the core imaging device is lifted upward at a predetermined speed through the lifting cable. At this time, the transmitting probe emits ultrasonic waves, and the ultrasonic waves are received by the first receiving probe and the second receiving probe to form a waveform diagram, as Figure 7 shown. The acquisition frequency of the waveform diagram is once every 10 - 20 cm of lifting the core imaging device.

[0076] Step S104: Obtain the ultrasonic wave velocity based on the measurement result, and fuse the ultrasonic wave velocity with the drilling panoramic columnar diagram to obtain an imaging result and output it.

[0077] In a possible implementation, obtaining the ultrasonic wave velocity based on the measurement result, specifically:

[0078] Use the first time and the second time as input values, and obtain the ultrasonic wave velocity through a first formula;

[0079] Among them, the specific first formula is:

[0080]

[0081] wherein, v is the ultrasonic wave velocity, and t 1 is the first time; t 2 is the second time; L 1 is the distance between the transmitting probe and the first receiving probe; L 2 is the distance between the transmitting probe and the second receiving probe.

[0082] In this embodiment, since the distances between the transmitting probe and the first receiving probe and between the transmitting probe and the second receiving probe are known, and the first time and the second time are obtained based on the above steps, at this time, the ultrasonic wave velocity can be obtained according to the first formula, and the ultrasonic wave velocity is fused with the drilling panoramic histogram as an imaging result for output. The imaging result is as Figure 8 shown.

[0083] Furthermore, in addition to the core imaging device, the drilling core imaging system further includes a receiving module, a main control module, a high-voltage excitation module, a digital imaging module, an automatic processing module, and a display result module, as Figure 3 shown, wherein the main control module is used to control the normal operation of these external modules, including controlling the high-voltage excitation module to excite the transmitting probe so that the transmitting probe emits ultrasonic waves. The receiving module then sends the ultrasonic wave information received by the first receiving probe and the second receiving probe to the main control module. The digital imaging module is used to perform digital imaging on the real-time images collected by the panoramic camera and send them to the automatic processing module through the main control module. The automatic processing module is used to summarize the information sent by the main control module, calculate and process to obtain the imaging result and send it to the display result module. The display result module is used to display the imaging result.

[0084] In summary, by applying the above technical solutions, a drilling core imaging method for near-surface structures is proposed. The method includes: after completing the drilling cleaning of the near-surface structure, placing the core imaging device in the drilling; collecting real-time images of the drilling through the core imaging device, performing synchronous correction processing on the real-time images, and when the probe of the core imaging device is placed at the bottom of the drilling, scanning row by row to obtain a drilling panoramic histogram; blocking the hole opening and filling it with water until it is full, performing ultrasonic measurement based on the core imaging device to obtain a measurement result; obtaining the ultrasonic wave velocity based on the measurement result, and fusing the ultrasonic wave velocity with the drilling panoramic histogram as an imaging result for output. Through the core imaging device, the image and ultrasonic wave velocity of the near-surface structure can be obtained in real time, improving the accuracy of near-surface structure investigation and reducing the construction cost. Using a panoramic high-definition camera to complete rapid digital core imaging, and at the same time using an ultrasonic probe to detect the ultrasonic wave velocity in the rock mass, improving the accuracy of surface structure investigation, which is also an effective supplement to existing detection technologies.

[0085] The embodiments of the present application also propose a borehole core imaging device for near-surface structures, such as Figure 9 shown. The device includes:

[0086] A placement module 10, configured to place the core imaging device in the borehole after the borehole cleaning of the near-surface structure is completed;

[0087] A synchronization correction module 20, configured to collect real-time images of the borehole through the core imaging device, perform synchronization correction processing on the real-time images, and when the probe of the core imaging device is placed at the bottom of the borehole, scan line by line to obtain a panoramic columnar diagram of the borehole;

[0088] A measurement module 30, configured to block the hole opening and fill the hole with water until it is full, and perform ultrasonic measurement based on the core imaging device to obtain a measurement result;

[0089] An output module 40, configured to obtain an ultrasonic velocity based on the measurement result, fuse the ultrasonic velocity with the panoramic columnar diagram of the borehole into an imaging result and output it.

[0090] Figure 10 FIG. shows a structural block diagram of a computing device 400 provided according to an embodiment of the present specification. The components of the computing device 400 include, but are not limited to, a memory 410 and a processor 420. The processor 420 is connected to the memory 410 through a bus 430, and a database 450 is used to store data.

[0091] The computing device 400 also includes an access device 440, which enables the computing device 400 to communicate via one or more networks 460. Examples of such networks include the Public Switched Telephone Network (PSTN), Local Area Network (LAN), Wide Area Network (WAN), Personal Area Network (PAN), or a combination of communication networks such as the Internet. The access device 440 may include one or more of any type of wired or wireless network interface (e.g., network interface card (NIC)), such as an IEEE 802.11 Wireless Local Area Network (WLAN) wireless interface, Worldwide Interoperability for Microwave Access (Wi-MAX) interface, Ethernet interface, Universal Serial Bus (USB) interface, cellular network interface, Bluetooth interface, Near Field Communication (NFC).

[0092] In one embodiment of the present specification, the above components of the computing device 400, as well as Figure 10 other components not shown, may also be connected to each other, for example, via a bus. It should be understood that Figure 10 the block diagram of the computing device shown is for illustrative purposes only and is not a limitation on the scope of the present specification. Those skilled in the art may add or replace other components as needed.

[0093] The computing device 400 can be any type of stationary or mobile computing device, including mobile computers or mobile computing devices (e.g., tablet computers, personal digital assistants, laptop computers, notebook computers, netbooks, etc.), mobile phones (e.g., smartphones), wearable computing devices (e.g., smartwatches, smart glasses, etc.) or other types of mobile devices, or stationary computing devices such as desktop computers or personal computers (PCs). The computing device 400 can also be a mobile or stationary server.

[0094] Among them, the processor 420 is used to execute the following computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the above-mentioned borehole core imaging method for near-surface structures are implemented. The above is a schematic solution of a computing device according to this embodiment. It should be noted that the technical solution of this computing device and the technical solution of the above-mentioned borehole core imaging method for near-surface structures belong to the same concept. For the detailed content not described in the technical solution of the computing device, reference can be made to the description of the technical solution of the above-mentioned borehole core imaging method for near-surface structures.

[0095] An embodiment of this specification also provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the above-mentioned borehole core imaging method for near-surface structures are implemented.

[0096] The above is a schematic solution of a computer-readable storage medium according to this embodiment. It should be noted that the technical solution of this storage medium and the technical solution of the above-mentioned borehole core imaging method for near-surface structures belong to the same concept. For the detailed content not described in the technical solution of the storage medium, reference can be made to the description of the technical solution of the above-mentioned borehole core imaging method for near-surface structures.

[0097] An embodiment of this specification also provides a computer program. When the computer program is executed on a computer, the computer is made to execute the steps of the above-mentioned borehole core imaging method for near-surface structures.

[0098] The above is a schematic solution of a computer program according to this embodiment. It should be noted that the technical solution of this computer program and the technical solution of the above-mentioned borehole core imaging method for near-surface structures belong to the same concept. For the detailed content not described in the technical solution of the computer program, reference can be made to the description of the technical solution of the above-mentioned borehole core imaging method for near-surface structures.

[0099] The above describes specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be executed in a different order than in the embodiments and still achieve the desired result. Additionally, the processes depicted in the figures do not necessarily require the particular order or sequential order shown to achieve the desired result. In certain implementations, multitasking and parallel processing are also possible or may be advantageous.

[0100] The computer instructions include computer program code, which may be in the form of source code, object code, executable files or some intermediate forms, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice within the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0101] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the embodiments of this specification are not limited by the described action sequence, because according to the embodiments of this specification, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the embodiments of this specification.

[0102] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0103] The preferred embodiments of this specification disclosed above are only used to help explain this specification. The optional embodiments do not elaborate all the details, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of the embodiments of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the embodiments of this specification, so that those skilled in the art can understand and utilize this specification well. This specification is only limited by the claims and their full scope and equivalents.

Claims

1. A method for imaging a borehole core of a near-surface structure, characterized in that: Applied in a borehole core imaging system including a core imaging device, the method comprises: After completing the drilling and cleaning of the near-surface structure, placing the core imaging device in the drilling hole; The core imaging device is used to collect real-time images of the borehole, and the real-time images are synchronously corrected. When the probe of the core imaging device is placed at the bottom of the borehole, a panoramic columnar diagram of the borehole is acquired by scanning line by line; The hole is sealed and water is injected until the hole is full, and ultrasonic measurement is performed based on the core imaging device to obtain measurement results; The ultrasonic velocity is obtained based on the measurement result, and the ultrasonic velocity is fused with the drilling panoramic histogram into an imaging result and outputted.

2. The method according to claim 1, characterized in that The core imaging device includes a gyroscope, a first receiving probe, a second receiving probe, a panoramic camera, a transmitting probe, a first filter pad, a second filter pad, a third filter pad and a customized glass cover. The gyroscope is arranged at the bottom of the core imaging device, the second receiving probe is arranged between the second end of the gyroscope and the first end of the third filter pad layer, the first receiving probe is arranged between the second end of the third filter pad layer and the first end of the second filter pad layer, the transmitting probe is arranged between the second end of the second filter pad layer and the first end of the first filter pad layer, the panoramic camera is arranged at the head of the core imaging device, and the first end of the panoramic camera is connected to the second end of the first filter pad layer, and the customized glass cover is arranged at the panoramic camera so that the customized glass cover protects the panoramic camera.

3. The method according to claim 2, characterized in that The core imaging device collects real-time images of the borehole, performs synchronous correction processing on the real-time images, and when the probe of the core imaging device is placed at the bottom of the borehole, scans line by line to obtain a panoramic columnar diagram of the borehole, specifically: The real-time image of the borehole is collected by a panoramic camera of the core imaging device; Acquire the posture information of the core imaging device based on the gyroscope, and construct a posture information storage table based on the posture information, wherein the posture information includes a direction angle and an inclination angle, and the posture information storage table also includes at least a count value; Synchronously correcting the real-time image based on an automatic image correction formula and the posture information; The synchronously corrected real-time images are spliced ​​line by line according to the count values ​​to obtain a drilling panoramic column chart, and the drilling depth and the azimuth are marked on the drilling panoramic column chart.

4. The method according to claim 3, characterized in that The image automatic correction formula includes an x-direction correction formula, a y-direction correction formula and a z-direction correction formula, wherein x', y', z' are the new coordinates after rotation, θ x ,θ y ,θ z They are the rotation angles in the x, y, and z directions: The X-direction correction formula is specifically: The Y direction correction formula is specifically: The Z direction correction formula is specifically:

5. The method according to claim 1, characterized in that The hole is sealed and water is injected until the hole is full. Ultrasonic measurement is performed based on the core imaging device to obtain measurement results, which are specifically: After the hole is plugged and water is injected until the hole is full, the core imaging device is lifted at a predetermined speed, and ultrasonic waves are emitted through the transmitting probe; Collecting ultrasonic wave waveforms at a predetermined frequency; Based on the waveform diagram, the first time and the second time are obtained, and the first time and the second time are used as the measurement results. The first time is the time when the ultrasonic wave reaches the first receiving probe from the transmitting probe, and the second time is the time when the ultrasonic wave reaches the second receiving probe from the transmitting probe.

6. The method according to claim 5, characterized in that The ultrasonic velocity is obtained based on the measurement results, specifically: Taking the first time and the second time as input values, the ultrasonic velocity is obtained by a first formula; The first formula is specifically: Wherein, v is the ultrasonic velocity, t1 is the first time, t2 is the second time, L1 is the distance between the transmitting probe and the first receiving probe, and L2 is the distance between the transmitting probe and the second receiving probe.

7. A drilling core imaging device for near-surface structures, characterized in that: The device comprises: A placement module, used to place the core imaging device in the borehole after completing the drilling cleaning of the near-surface structure; A synchronous correction module, used for collecting real-time images of the borehole through the core imaging device, performing synchronous correction processing on the real-time images, and scanning line by line to obtain a panoramic columnar diagram of the borehole when the probe of the core imaging device is placed at the bottom of the borehole; A measuring module, used for plugging the hole opening and injecting water until the hole is full, performing ultrasonic measurement based on the core imaging device to obtain a measurement result; An output module is used to obtain the ultrasonic velocity based on the measurement result, fuse the ultrasonic velocity with the drilling panoramic column chart into an imaging result, and output the imaging result.

8. A computing device, characterized in that include: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the borehole core imaging method for near-surface structures described in any one of claims 1 to 7 are implemented.

9. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the method for imaging a borehole core for a near-surface structure as claimed in any one of claims 1 to 6.

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