On-site core three-dimensional reconstruction method and system

Abstract

The disclosed embodiment discloses a method and system for on-site three-dimensional reconstruction of a core, wherein the method comprises: controlling a core placed on a core feeding device to perform reciprocating linear motion along a set path in the core feeding device; scanning the core performing forward linear motion by a three-dimensional scanning device to obtain a grayscale distribution image of the core; performing three-dimensional reconstruction on the core based on the grayscale distribution image to obtain a reconstructed three-dimensional structure of the core; scanning the core performing reverse linear motion by a hyperspectral imager to obtain reflectance spectrum data of the core; determining the type of at least one mineral included in the reconstructed three-dimensional structure and the content of at least one mineral based on the reflectance spectrum data; the present embodiment realizes continuous and uninterrupted scanning of the core based on the three-dimensional scanning technology and the hyperspectral imaging technology, and obtains the prototype state structure and material information of the core at room temperature and pressure before deformation through algorithm reconstruction.

Description

Technical Field

[0001] The present invention relates to a method and system for on-site three-dimensional reconstruction of rock cores. Background Art

[0002] As important physical geological data, cores, especially cores thousands of meters deep in the earth obtained by continental scientific drilling projects, are the core medium for studying deep materials and structures, and therefore are precious archives for studying the evolution and changes of the earth. With the advancement of science and technology, the digitization of cores has become inevitable, and the information industry driven by digital cores will greatly promote the research of earth sciences and the development of related industries.

[0003] Currently, due to the constraints of the drilling site space and complex environmental factors, the digitization of cores is mostly arranged in the relevant core collection departments far away from the well site. In addition, due to the large size and inconvenience of movement of existing high-precision imaging devices such as internal structure imaging devices based on X-CT technology, there is only a small amount of digitization work at present. However, the cores obtained from the deep earth with great difficulty will be very sensitive to environmental factors due to their own composition and structure factors through subsequent processing, sorting and transportation. In addition, various human-induced reasons will cause the internal structure of the core to change. In this way, the data obtained in the relevant core collection departments or after sampling and inspection are deviated from the original state of the core after it comes out of the barrel, which in turn affects the evaluation, utilization and development of deep energy resources. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure is proposed. The embodiments of the present disclosure provide a method and system for on-site core three-dimensional reconstruction.

[0005] According to one aspect of an embodiment of the present disclosure, a method for three-dimensional reconstruction of an on-site rock core is provided, comprising:

[0006] Controlling a core placed on a core feeding device to perform reciprocating linear motion along a set path in the core feeding device;

[0007] Scanning the core performing positive linear motion by a three-dimensional scanning device to obtain a grayscale distribution image of the core;

[0008] Performing three-dimensional reconstruction on the core based on the grayscale distribution image to obtain a reconstructed three-dimensional structure of the core;

[0009] Scanning the core performing reverse linear motion by a hyperspectral imager to obtain reflectance spectrum data of the core;

[0010] The type of at least one mineral included in the reconstructed three-dimensional structure and the content of the at least one mineral are determined based on the reflectance spectrum data.

[0011] Optionally, controlling the core placed on the core feeding device to perform reciprocating linear motion along a set path in the core feeding device comprises:

[0012] Fixing the core on the core support of the core feeding device by means of a clamping block;

[0013] The core is controlled to follow a set path of the core support member to perform reciprocating linear motion.

[0014] Optionally, the three-dimensional scanning device includes a turntable, an X-ray source and an X-ray detector arranged on one side of the turntable, and an electric slip ring arranged on the other side of the turntable;

[0015] Scanning the core performing the forward linear motion by a three-dimensional scanning device to obtain a grayscale distribution image of the core includes:

[0016] Based on the electric slip ring being driven by the rotation of the turntable, a control signal and power are provided to the X-ray source and the X-ray detector;

[0017] The X-ray source and the X-ray detector are controlled according to the control signal to scan the core to obtain a grayscale distribution image of the core.

[0018] Optionally, controlling the X-ray source and the X-ray detector to scan the core according to the control signal to obtain a grayscale distribution image of the core includes:

[0019] According to the control signal, the X-ray source and the X-ray detector are controlled to transmit an X-ray beam to the core every time the core rotates by a set angle, so as to obtain a grayscale distribution image of the core.

[0020] Optionally, before controlling the X-ray source and the X-ray detector to scan the core according to the control signal to obtain the grayscale distribution image of the core, the method further includes:

[0021] controlling a detector position adjustment mechanism disposed between the X-ray source and the X-ray detector to adjust the distance between the X-ray source and the X-ray detector according to the control signal;

[0022] Based on the adjusted distance, a region of interest of the X-ray source and the X-ray detector is determined; wherein the region of interest is a region range scanned by the X-ray source and the X-ray detector each time.

[0023] Optionally, determining the type of at least one mineral included in the reconstructed three-dimensional structure and the content of the at least one mineral based on the reflectance spectrum data comprises:

[0024] Determining the type and distribution of at least one mineral in the core based on the reflectance spectrum data;

[0025] The distribution of the at least one mineral is applied to the reconstructed three-dimensional structure to determine the type of the at least one mineral included in the reconstructed three-dimensional structure and the content of the at least one mineral.

[0026] According to another aspect of the embodiment of the present disclosure, there is provided an on-site core three-dimensional reconstruction system, comprising: a core feeding device, a three-dimensional scanning device, a hyperspectral imager, and a three-dimensional reconstruction device;

[0027] The core feeding device is used to place the core and make the core perform reciprocating linear motion along a set path in the core feeding device according to control;

[0028] The three-dimensional scanning device is used to scan the core performing positive linear motion to obtain a grayscale distribution image of the core;

[0029] The hyperspectral imager is used to scan the core performing reverse linear motion to obtain reflectance spectrum data of the core;

[0030] The three-dimensional reconstruction device is used to perform three-dimensional reconstruction on the core based on the grayscale distribution image to obtain the reconstructed three-dimensional structure of the core, and determine the type of at least one mineral included in the reconstructed three-dimensional structure and the content of the at least one mineral based on the reflectance spectrum data.

[0031] Optionally, the three-dimensional scanning device comprises: a turntable, an X-ray source and an X-ray detector arranged on one side of the turntable, and an electric slip ring arranged on the other side of the turntable;

[0032] A through hole is provided in the middle of the turntable, and the set path of the core feeding device passes through the through hole;

[0033] The electric slip ring is driven by the rotation of the turntable to provide control signals and power for the X-ray source and the X-ray detector;

[0034] The X-ray source and the X-ray detector scan the core according to the control of the control signal to obtain a grayscale distribution image of the core.

[0035] Optionally, the three-dimensional scanning device further includes: a base;

[0036] The base is arranged at a set position away from the through hole, and is used to connect the X-ray source and the X-ray detector. The distance between the X-ray source and the X-ray detector is increased or decreased by the base to control the area of ​​interest detected by the three-dimensional scanning device.

[0037] Optionally, the electric slip ring includes a stator and a rotor connected by a bearing, and both the stator and the rotor are hollow cylindrical structures with openings at both ends. After the rotor and the stator are fixed by docking, they are connected to the turntable through a transition point based on a hexagonal screw and a locating pin.

[0038] Optionally, the core feeding device comprises: a core support, a height adjustment mechanism, a linear movement adjustment mechanism, a support frame and a pressing block;

[0039] The core support is used to place the core and provide a set path for the reciprocating linear motion of the core;

[0040] The pressing block is arranged on the slider of the linear movement adjusting mechanism through the height adjusting mechanism, and the height of the pressing block can be adjusted through the height adjusting mechanism so that the central axis of the core on the core supporting member and the center of the through hole of the rotating disk are located at the same height;

[0041] The support frame is used to provide support for the linear motion adjustment mechanism, and the hyperspectral imager is arranged directly above the end of the support frame.

[0042] Optionally, it also includes: a three-dimensional visualization device;

[0043] The three-dimensional visualization device is used to display the reconstructed three-dimensional structure.

[0044] Optionally, it also includes: a core scanning database, a hyperspectral database and a reconstruction database;

[0045] The core scanning database is used to store the grayscale distribution image of the core scanned by the three-dimensional scanning device;

[0046] The hyperspectral database is used to store the reflectance spectrum data of the core scanned by the hyperspectral imager;

[0047] The reconstructed volume database is used to store the reconstructed three-dimensional structure of the core obtained by the three-dimensional reconstruction device.

[0048] Based on the above-mentioned embodiment of the present disclosure, a method and system for on-site three-dimensional reconstruction of a core are provided, which control a core placed on a core feeding device to perform reciprocating linear motion along a set path in the core feeding device; the core performing forward linear motion is scanned by a three-dimensional scanning device to obtain a grayscale distribution image of the core; the core is three-dimensionally reconstructed based on the grayscale distribution image to obtain a reconstructed three-dimensional structure of the core; the core performing reverse linear motion is scanned by a hyperspectral imager to obtain reflectance spectrum data of the core; the type of at least one mineral included in the reconstructed three-dimensional structure and the content of the at least one mineral are determined based on the reflectance spectrum data; this embodiment is based on three-dimensional scanning technology and hyperspectral imaging technology, integrated in an independently developed drilling site device, to achieve continuous and uninterrupted scanning of the core, and through algorithm reconstruction, the prototype state structure and material information of the core before deformation at normal temperature and pressure are obtained.

[0049] The technical solution of the present disclosure is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The above and other purposes, features and advantages of the present disclosure will become more apparent by describing the embodiments of the present disclosure in more detail in conjunction with the accompanying drawings. The accompanying drawings are used to provide a further understanding of the embodiments of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the present disclosure and do not constitute a limitation of the present disclosure. In the drawings, the same reference numerals generally represent the same components or steps.

[0051] Figure 1 It is a flow chart of a method for on-site core three-dimensional reconstruction provided by an exemplary embodiment of the present disclosure.

[0052] Figure 2a It is a schematic diagram of a grayscale distribution image obtained by a three-dimensional scanning device in an optional example of an on-site core three-dimensional reconstruction method provided by an exemplary embodiment of the present disclosure.

[0053] Figure 2b It is a schematic diagram of a reconstructed three-dimensional structure in an optional example of an on-site core three-dimensional reconstruction method provided by an exemplary embodiment of the present disclosure.

[0054] Figure 2c Yes Figure 2b Schematic diagram of the reconstructed 3D structure of the example shown after extracting the nails inside the artificial synthetic core.

[0055] Figure 3 It is a structural schematic diagram of an on-site core three-dimensional reconstruction system provided by an exemplary embodiment of the present disclosure.

[0056] Figure 4aIt is a structural schematic diagram of one side of a turntable of a three-dimensional scanning device in an on-site core three-dimensional reconstruction system provided by an exemplary embodiment of the present disclosure.

[0057] Figure 4b yes Figure 4a Schematic diagram of the structure of the other side of the turntable shown.

[0058] Figure 5 It is a schematic structural diagram of a core feeding device in an on-site core three-dimensional reconstruction system provided by an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0059] Below, the exemplary embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments of the present disclosure, and it should be understood that the present disclosure is not limited to the exemplary embodiments described here.

[0060] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

[0061] Those skilled in the art can understand that the terms "first" and "second" in the embodiments of the present disclosure are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0062] It should also be understood that in the embodiments of the present disclosure, “plurality” may refer to two or more than two, and “at least one” may refer to one, two, or more than two.

[0063] It should also be understood that any component, data or structure mentioned in the embodiments of the present disclosure can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0064] In addition, the term "and / or" in this disclosure is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this disclosure generally indicates that the previous and next associated objects are in an "or" relationship. The data referred to in this disclosure may include unstructured data such as text, images, and videos, and may also be structured data.

[0065] It should also be understood that the description of the various embodiments in the present disclosure focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0066] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0067] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0068] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0069] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0070] The disclosed embodiments can be applied to electronic devices such as terminal devices, computer systems, servers, etc., which can operate with many other general or special computing system environments or configurations. Examples of well-known terminal devices, computing systems, environments and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, servers, etc. include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, large computer systems, and distributed cloud computing technology environments including any of the above systems, etc.

[0071] Electronic devices such as terminal devices, computer systems, servers, etc. can be described in the general context of computer system executable instructions (such as program modules) executed by computer systems. Generally, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in a distributed cloud computing environment, where tasks are performed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules can be located on local or remote computing system storage media including storage devices.

[0072] Exemplary Methods

[0073] Figure 1 1 is a flow chart of a method for three-dimensional reconstruction of a core in situ provided by an exemplary embodiment of the present disclosure. This embodiment can be applied to electronic devices, such as Figure 1 As shown, the following steps are included:

[0074] Step 102: Control the core placed on the core feeding device to perform reciprocating linear motion along a set path in the core feeding device.

[0075] Among them, the core is a rock sample taken out from the hole at the drilling site according to the needs of geological exploration work or engineering, using an annular core drill bit or other coring tools; the shape of the core can be cylindrical or other shapes; in this embodiment, the obtained core is placed on a core feeding device, so that the core performs reciprocating linear motion including forward linear motion and reverse linear motion on a set path.

[0076] Step 104 , scanning the core performing the forward linear motion by a three-dimensional scanning device to obtain a grayscale distribution image of the core.

[0077] Optionally, the three-dimensional scanning can use computer tomography (CT) technology to transmit an X-ray beam to the core to obtain a grayscale distribution image of the core; wherein the grayscale has 256 levels, and different levels represent different components, for example, gray represents the core rock mass, and the bright part represents the metal inside the core, etc. For example, Figure 2a Shown is a grayscale image of a core slice obtained by scanning once in an optional example.

[0078] Step 106: Perform three-dimensional reconstruction on the core based on the grayscale distribution image to obtain a reconstructed three-dimensional structure of the core.

[0079] In this embodiment, the internal three-dimensional structure of the core can be obtained by using CT data for three-dimensional reconstruction, and parameters such as pore throat and fractal dimension of the core can be analyzed. For example, using multiple Figure 2a The grayscale image of the core slice shown in the figure is reconstructed in three dimensions to obtain the following Figure 2b The reconstructed three-dimensional structure shown in Figure 1 and the internal structure analysis can be obtained as follows: Figure 2c As shown, the image after the nails inside the core are extracted (the core in this example is a synthetic core, and the nails are added inside to achieve the test).

[0080] Step 108 , scanning the core performing the reverse linear motion by means of a hyperspectral imager to obtain reflectance spectrum data of the core.

[0081] Optionally, a hyperspectral imager is arranged above the core movement path, and the hyperspectral imager is used to collect and analyze the reflectance spectrum data of cores, cuttings and other samples in the wavelength range of 1000-2400nm.

[0082] Step 110: determining the type of at least one mineral and the content of at least one mineral included in the reconstructed three-dimensional structure based on the reflectance spectrum data.

[0083] Optionally, using hyperspectral data, different minerals can be identified based on their spectral diagnostic characteristics, thereby achieving automatic identification of minerals. The identified minerals can be applied to three-dimensional reconstruction to classify the mineral types in the core, further obtain the fine structure of the core, and determine the mineral types and content of the core.

[0084] The above-mentioned embodiment of the present disclosure provides a method for on-site three-dimensional reconstruction of a core, which controls a core placed on a core feeding device to perform reciprocating linear motion along a set path in the core feeding device; scans the core performing forward linear motion by a three-dimensional scanning device to obtain a grayscale distribution image of the core; performs three-dimensional reconstruction on the core based on the grayscale distribution image to obtain a reconstructed three-dimensional structure of the core; scans the core performing reverse linear motion by a hyperspectral imager to obtain reflectance spectrum data of the core; determines the type of at least one mineral included in the reconstructed three-dimensional structure and the content of the at least one mineral based on the reflectance spectrum data; this embodiment is based on three-dimensional scanning technology and hyperspectral imaging technology, integrated in a self-developed drilling site device, realizes continuous and uninterrupted scanning of the core, and obtains the prototype state structure and material information of the core at room temperature and pressure before deformation through algorithm reconstruction.

[0085] The disclosed embodiment can simultaneously obtain the three-dimensional internal structure data of the core and the hyperspectral data reflecting the mineralogical information of the scanned core, and can be used in various drilling and coring sites, with convenient operation, timeliness and efficiency, and reliable data.

[0086] In some optional embodiments, step 102 may include: fixing the core on a core support of a core feeding device by a clamping block;

[0087] The core is controlled to perform reciprocating linear motion following the set path of the core support.

[0088] In this embodiment, the core is fixed on the core support by a clamping block. The core support is arranged in the horizontal direction and is used to place the core taken out from the exploration site and provide support for the core. Since most cores are cylindrical, the support surface of the core support that contacts the core is constructed as an arc surface, with the arc surface facing upward. In this way, after the core is placed on the arc support surface provided by the core support, the two sides of the arc support surface will form a barrier to the core, thereby preventing the core from rolling off the arc support surface. The core support can be made of carbon fiber, which has a carbon content of more than 90% and has the characteristics of high strength, high modulus and low density. Its high strength can support samples of larger mass without deformation, and its low density is conducive to the passage of X-rays and has little effect on the imaging of the core. Of course, other manufacturing materials can also be used.

[0089] Optionally, in this embodiment, the power output by the driving mechanism can be transmitted to the core support member through the linear movement adjustment mechanism included in the core feeding device, and the torque can be converted into linear motion and transmitted to the core support member to drive the core support member to reciprocate linear motion within a set range. In this embodiment, since scanning needs to be performed separately during the reciprocating motion, the size of the set range needs to be greater than twice the maximum length of the core.

[0090] As a preferred embodiment of the linear motion adjustment mechanism, the linear motion adjustment mechanism includes a linear guide rail, a slider, and a ball screw matched with the slider. The linear guide rail is installed on the support frame to provide sliding support for the slider. A clamping block is arranged above the slider, and the clamping block is fixedly connected to one end of the horizontally arranged core support member, and the end of the core support member is clamped and fixed in the vertical direction, so that it can completely pass from one side of the three-dimensional scanning device to the other side of the three-dimensional scanning device within a set range, so that the three-dimensional scanning device can effectively perform CT scanning on the core.

[0091] Optionally, the three-dimensional scanning device includes a turntable, an X-ray source and an X-ray detector arranged on one side of the turntable, and an electric slip ring arranged on the other side of the turntable;

[0092] Step 104 may include:

[0093] Based on the electric slip ring driven by the turntable, it provides control signals and power for the X-ray source and X-ray detector;

[0094] The X-ray source and the X-ray detector are controlled according to the control signal to scan the core and obtain a grayscale distribution image of the core.

[0095] The three-dimensional scanning device can be an X-ray three-dimensional CT device, which is used to obtain three-dimensional digital core data. The three-dimensional scanning device includes a turntable, which is rotatable. A through hole can be provided in the center of the turntable. During the CT scanning of the core by the three-dimensional scanning device, the core feeding device that provides support for the core moves horizontally from one side of the through hole to the other side. In other words, the through hole provides a channel for the core support to make reciprocating linear motion within a set range. Therefore, the size of the through hole is adapted to the size of the core support that provides support for the core, so that the core can pass horizontally and can also move slightly in the vertical direction. For example, the shape of the through hole can be circular with a diameter of 220 mm. Correspondingly, the size of the arc-shaped support surface of the core support shall not be greater than the diameter of the through hole, and the height of the core support is limited by the diameter of the through hole.

[0096] In one embodiment, the X-ray detector is an X-ray integrating flat panel detector with a single ray source, the X-ray source and the X-ray detector are simultaneously arranged at a position adjacent to the through hole through a base, the X-ray source is arranged adjacent to the through hole in a manner opposite to the X-ray detector, and the X-ray integrating flat panel detector is used to obtain three-dimensional CT internal structure data of the core. Optionally, the X-ray source is arranged at a position where the X-rays it emits can pass through the core, and the energy intensity of the X-rays will change before and after passing through the core; the intensity of the X-rays emitted by the X-ray source and the time of the emitted rays are controlled by the control of the ray source controller.

[0097] The X-ray integrating flat panel detector is arranged opposite to the X-ray source, and is arranged on both sides of the through hole. It detects the intensity change of the X-ray after passing through the core, images the inside of the core, and obtains the three-dimensional CT internal structure data of the core. The X-ray integrating flat panel detector has the advantages of high imaging resolution and fast imaging speed.

[0098] In one embodiment, an electric slip ring is further provided on the other side of the turntable, the central axis of the electric slip ring and the rotation axis of the turntable are located on the same straight line, the rotor of the electric slip ring is connected to the turntable and driven by the turntable, rotating with the rotation of the turntable, providing power and control signal transmission for the X-ray source and the X-ray integrating flat panel detector in the three-dimensional scanning device.

[0099] The electric slip ring includes a stator and a rotor. Both the stator and the rotor are hollow cylindrical structures with openings at both ends. The stator is rotatably mounted on the outside of the rotor. The central axes of the two are on the same straight line with the center of the through hole.

[0100] A copper ring loop is installed on the rotor, and a brush is installed on the stator. The external electrical connector led out from the stator is connected to an external power supply and a signal control unit through a cable. The external electrical connector is also connected to an X-ray source, an X-ray integrating flat-panel detector, a ray source controller and a detector controller through a cable. The power supply supplies power to all electrical equipment in the three-dimensional scanning device through the cable, and the signal control unit transmits control instructions to the X-ray source and the X-ray integrating flat-panel detector on the turntable through the cable.

[0101] In this embodiment, since the heat generated by the X-ray source and the X-ray integrating flat panel detector during operation is limited, there is no need to add a heat dissipation device. Therefore, in this embodiment, the electric slip ring is used to solve the power supply and signal control of the detector, the ray source and the control computer above the turntable when the turntable rotates continuously, and a high-power ray source and a high signal-to-noise ratio detector can be used.

[0102] Optionally, controlling the X-ray source and the X-ray detector to scan the core according to the control signal to obtain a grayscale distribution image of the core may include:

[0103] According to the control signal, the X-ray source and the X-ray detector are controlled to transmit the X-ray beam to the core every time the set angle is rotated, so as to obtain a grayscale distribution image of the core.

[0104] In this embodiment, the electric slip ring is driven by the rotation of the turntable to provide power for the control signal of the X-ray source and the X-ray detector. Optionally, a CT scan is performed every time the turntable rotates one circle, so that the CT scan of the core is performed at the same angle, or a CT scan is performed every time the turntable rotates a set angle; when the turntable rotates continuously, the core is continuously scanned to obtain multiple grayscale distribution images (slice grayscale images).

[0105] Optionally, before controlling the X-ray source and the X-ray detector to scan the core according to the control signal to obtain the grayscale distribution image of the core, the method further includes:

[0106] Controlling a detector position adjustment mechanism disposed between the X-ray source and the X-ray detector according to a control signal to adjust the distance between the X-ray source and the X-ray detector;

[0107] Based on the adjusted distance, the region of interest between the X-ray source and the X-ray detector is determined.

[0108] The region of interest is the area scanned by the X-ray source and the X-ray detector each time.

[0109] The base in this embodiment is a detector position adjustment mechanism, through which the distance between the X-ray source and the X-ray detector can be increased or decreased to control the region of interest for detection.

[0110] In some optional embodiments, step 110 may include:

[0111] determining the type and distribution of at least one mineral in the core based on the reflectance spectral data;

[0112] The distribution of at least one mineral is applied to the reconstructed three-dimensional structure to determine the type of at least one mineral and the content of at least one mineral included in the reconstructed three-dimensional structure.

[0113] In this embodiment, the hyperspectral imager can be set above the core movement path through a planar line scanning device to obtain reflection spectrum data; by combining the reflection spectrum data with the reconstructed three-dimensional structure, the type of at least one mineral included in the core and the content of at least one mineral can be determined.

[0114] Any on-site core 3D reconstruction method provided in the embodiments of the present disclosure may be executed by any appropriate device with data processing capabilities, including but not limited to: a terminal device and a server, etc. Alternatively, any on-site core 3D reconstruction method provided in the embodiments of the present disclosure may be executed by a processor, such as the processor executing any on-site core 3D reconstruction method mentioned in the embodiments of the present disclosure by calling corresponding instructions stored in a memory. This will not be described in detail below.

[0115] Exemplary Systems

[0116] Figure 3 FIG. 1 is a schematic diagram of the structure of an on-site core three-dimensional reconstruction system provided by an exemplary embodiment of the present disclosure. Figure 3 As shown, the device provided in this embodiment includes: a core feeding device 31, a three-dimensional scanning device 32, a hyperspectral imager 33 and a three-dimensional reconstruction device;

[0117] The core feeding device 31 is used to place the core and make the core perform reciprocating linear motion along a set path in the core feeding device according to control.

[0118] The three-dimensional scanning device 32 is used to scan the core performing positive linear motion to obtain a grayscale distribution image of the core.

[0119] The hyperspectral imager 33 is used to scan the core performing the reverse linear motion to obtain the reflection spectrum data of the core.

[0120] A three-dimensional reconstruction device (not shown in the figure) is used to perform three-dimensional reconstruction on the core based on the grayscale distribution image to obtain the reconstructed three-dimensional structure of the core, and determine the type of at least one mineral included in the reconstructed three-dimensional structure and the content of at least one mineral based on the reflectance spectrum data.

[0121] In this embodiment, it can be considered that the core feeding device 31, the three-dimensional scanning device 32 and the hyperspectral imager 33 constitute an on-site core three-dimensional reconstruction device, and the three-dimensional reconstruction device can be implemented as a functional module integrated in a processing device (for example, a computer, a cloud, etc.), and the three-dimensional reconstruction device can be connected to the three-dimensional scanning device 32 and the hyperspectral imager 33 by wire or wireless.

[0122] The above-mentioned embodiment of the present disclosure provides an on-site core three-dimensional reconstruction system, which controls a core placed on a core feeding device to perform reciprocating linear motion along a set path in the core feeding device; scans the core performing forward linear motion by a three-dimensional scanning device to obtain a grayscale distribution image of the core; performs three-dimensional reconstruction on the core based on the grayscale distribution image to obtain a reconstructed three-dimensional structure of the core; scans the core performing reverse linear motion by a hyperspectral imager to obtain reflectance spectrum data of the core; determines the type of at least one mineral included in the reconstructed three-dimensional structure and the content of the at least one mineral based on the reflectance spectrum data; this embodiment is based on three-dimensional scanning technology and hyperspectral imaging technology, integrated in an independently developed drilling site device, realizes continuous and uninterrupted scanning of the core, and obtains the prototype state structure and material information of the core at room temperature and pressure before deformation through algorithm reconstruction.

[0123] Alternatively, if Figure 4a and 4b , which are schematic diagrams of the structure of one side and the other side of the turntable 321, respectively. The three-dimensional scanning device 32 includes: a turntable 321, an X-ray source 322 and an X-ray detector 323 arranged on one side of the turntable 321, and an electric slip ring 324 arranged on the other side of the turntable 321;

[0124] A through hole 325 is provided in the middle of the turntable 321, and the setting path of the core feeding device 31 passes through the through hole 325;

[0125] The electric slip ring 324 is driven by the rotation of the turntable 321 to provide control signals and power for the X-ray source 322 and the X-ray detector 323;

[0126] The X-ray source 322 and the X-ray detector 323 scan the core according to the control signal to obtain a grayscale distribution image of the core.

[0127] The three-dimensional scanning device 32 further includes: a base 326;

[0128] The base 326 is set at a set position away from the through hole 325, and is used to connect the X-ray source 322 and the X-ray detector 323. The distance between the X-ray source 322 and the X-ray detector 323 is increased or decreased by the base 326 to control the area of ​​interest detected by the three-dimensional scanning device 32.

[0129] like Figure 4b As shown, the electric slip ring 324 includes a stator 327 and a rotor 328 connected by a bearing. Both the stator 327 and the rotor 328 are hollow cylindrical structures with openings at both ends. After the rotor 328 is fixed to the stator 327 by docking, it is connected to the turntable 321 through a transfer point based on a hexagonal screw and a locating pin.

[0130] The rotor 328 of the electric slip ring 324 is connected to the rotating disk 321 and driven by the rotating disk 321 .

[0131] In some optional embodiments, such as Figure 5 As shown, the core feeding device 31 includes: a core support 311, a height adjustment mechanism 312, a linear movement adjustment mechanism 313, a support frame 314 and a pressing block 315;

[0132] The core support 311 is used to place the core and provide a set path for the reciprocating linear motion of the core;

[0133] Optionally, the core support 311 can be made of a carbon fiber round tube cut into a semicircle, one end of which is compressed by the compression block 315 so as to be arranged in the horizontal direction, and the other end is suspended so as to pass through the through hole 325 from one side to the other side within a set range.

[0134] The pressing block 315 is arranged on the slider of the linear movement adjusting mechanism 313 through the height adjusting mechanism 312. The height of the pressing block 315 can be adjusted through the height adjusting mechanism 312 so that the central axis of the core on the core support 311 and the center of the through hole of the rotating disk 321 are at the same height;

[0135] A height adjustment mechanism 312 is provided between the pressing block 315 and the slider. The driving part of the height adjustment mechanism 312 may be as follows: Figure 5 The rotating handle shown in the figure can be used to manually adjust the height of the height adjustment mechanism 312, thereby adjusting the height of the pressing block 315 relative to the support frame 314 to ensure that the central axis of the core and the center of the through hole 325 of the turntable 321 are at the same height. Of course, the drive unit can also adopt other manual height adjustment structures, and even can adopt electric drive to adjust the height.

[0136] The support frame 314 is used to provide support for the linear motion adjustment mechanism 313 , and the hyperspectral imager 33 is arranged just above the end of the support frame 314 .

[0137] Optionally, the system provided in this embodiment may further include: a three-dimensional visualization device;

[0138] A three-dimensional visualization device is used to display and reconstruct three-dimensional structures.

[0139] Optionally, the system provided in this embodiment may further include: a core scanning database, a hyperspectral database and a reconstruction database;

[0140] A core scanning database, used to store grayscale distribution images of the core scanned by a three-dimensional scanning device;

[0141] A hyperspectral database, used to store the reflectance spectrum data of the core scanned by the hyperspectral imager;

[0142] The reconstruction volume database is used to store the reconstructed three-dimensional structure of the core obtained by the three-dimensional reconstruction device.

[0143] In this embodiment, by constructing a massive database, an index database, and a spatial database, spatial data, core digitization results data, well data, and ground comprehensive object interpretation results data can be effectively managed and applied to improve the efficiency of exploration, development, and scientific research; wherein, the main databases may include a basic spatial database (basic spatial information such as the boundary of the work area, traffic information, and digital elevation model), a borehole database (spatial data of the borehole, i.e., the location data of the borehole for obtaining the core), a core catalog database (data generated during the core catalog process), a core scanning database (grayscale images of the core obtained by an X-ray three-dimensional CT device), a hyperspectral database (reflection spectrum data collected by a hyperspectral imager), a reconstruction database (three-dimensional reconstruction using hyperspectral data and CT grayscale images), a core comprehensive database (a comprehensive analysis library of core analysis results after reconstruction and logging, rock physics, geochemistry, and other data), and the like. The on-site core 3D reconstruction system applies massive data storage technology, spatial database technology (integrating data sets of spatial element characteristics in a certain area), GIS analysis technology (obtaining and analyzing information such as the spatial position, distribution, morphology, formation and evolution of relevant geographic objects in spatial data), 3D visualization technology, etc., to integrate the digital core data resources acquired in segments, build a networked, visualized management and sharing service system for exploration and development and scientific researchers, and realize the standardization and normalization of data collection, processing and storage.

[0144] Digital core processing and analysis: 3D reconstruction is performed using CT data to obtain the internal 3D structure of the core (for example, Figure 2a , 2band 2c), the pore throat, fractal dimension and other parameters of the core can be analyzed; using hyperspectral data, different minerals can be identified based on their spectral diagnostic characteristics to achieve automatic identification of minerals; applying the identified minerals to three-dimensional reconstruction can classify the mineral types in the core, further obtain the fine structure of the core, and determine the mineral types and content of the core. Comprehensive application: by driving the database, geographic information retrieval, map visualization operation, reading and processing image files and other functions, a large amount of spatial data, logging data, other geophysical data and geochemical data are called for different combined analysis to establish a core database and prospecting application model. For example: effectively integrate the single well core information with the regional survey data to realize the display of detailed information of the well site through the drilling line; output the survey line data of the work area where the well site is located; display the seismic profile of the well site area; display and output the fusion interpretation results data; query and output the relevant report documents of the survey area; display and output the cross-well profile of the single well area and multi-well area; and display and output the calibration seismic profile and the interpretation results.

[0145] The system provided in this embodiment may also include an interactive layer, that is, a comprehensive cloud computing platform that takes into account both computing and data storage and processing, a platform based on 5G communication data transmission, and an overall architecture that adopts a cloud structure design, providing various cloud data interfaces and cloud operation interfaces, so as to easily realize user interactive access and "multi-screen integration" display of data and information results.

[0146] The basic principles of the present disclosure are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present disclosure are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present disclosure. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, and are not limitations. The above details do not limit the present disclosure to the necessity of adopting the above specific details to be implemented.

[0147] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the system embodiment, since it basically corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0148] The block diagrams of the devices, apparatuses, equipment, and systems involved in this disclosure are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including," "comprising," "having," and the like are open words, referring to "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or," and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0149] The method and apparatus of the present disclosure may be implemented in many ways. For example, the method and apparatus of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present disclosure may also be implemented as a program recorded in a recording medium, which includes machine-readable instructions for implementing the method according to the present disclosure. Therefore, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.

[0150] It should also be noted that in the apparatus, device and method of the present disclosure, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present disclosure.

[0151] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0152] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A method for three-dimensional reconstruction of on-site cores, characterized in that: include: Controlling a core placed on a core feeding device to perform reciprocating linear motion along a set path in the core feeding device; Scanning the core performing positive linear motion by a three-dimensional scanning device to obtain a grayscale distribution image of the core; Performing three-dimensional reconstruction on the core based on the grayscale distribution image to obtain a reconstructed three-dimensional structure of the core; Scanning the core performing reverse linear motion by a hyperspectral imager to obtain reflectance spectrum data of the core; Determining the type of at least one mineral included in the reconstructed three-dimensional structure and the content of the at least one mineral based on the reflectance spectrum data; The three-dimensional scanning device includes a turntable, an X-ray source and an X-ray detector arranged on one side of the turntable, and an electric slip ring arranged on the other side of the turntable; Scanning the core performing the forward linear motion by a three-dimensional scanning device to obtain a grayscale distribution image of the core includes: Based on the electric slip ring being driven by the rotation of the turntable, a control signal and power are provided to the X-ray source and the X-ray detector; controlling the X-ray source and the X-ray detector to scan the core according to the control signal to obtain a grayscale distribution image of the core; According to the control signal, the X-ray source and the X-ray detector are controlled to perform X-ray beam transmission on the core every time the core rotates by a set angle, so as to obtain a grayscale distribution image of the core.

2. The method according to claim 1, characterized in that The method of controlling a core placed on a core feeding device to perform reciprocating linear motion along a set path in the core feeding device comprises: Fixing the core on the core support of the core feeding device by means of a clamping block; The core is controlled to follow a set path of the core support member to perform reciprocating linear motion.

3. The method according to claim 1, characterized in that Before controlling the X-ray source and the X-ray detector to scan the core according to the control signal to obtain the grayscale distribution image of the core, the method further includes: controlling a detector position adjustment mechanism disposed between the X-ray source and the X-ray detector to adjust the distance between the X-ray source and the X-ray detector according to the control signal; Based on the adjusted distance, a region of interest of the X-ray source and the X-ray detector is determined; wherein the region of interest is a region range scanned by the X-ray source and the X-ray detector each time.

4. The method according to any one of claims 1 to 3, characterized in that: The determining, based on the reflectance spectrum data, the type of at least one mineral included in the reconstructed three-dimensional structure and the content of the at least one mineral comprises: Determining the type and distribution of at least one mineral in the core based on the reflectance spectrum data; The distribution of the at least one mineral is applied to the reconstructed three-dimensional structure to determine the type of the at least one mineral included in the reconstructed three-dimensional structure and the content of the at least one mineral.

5. A three-dimensional reconstruction system for on-site cores, characterized in that: include: Core feeding device, 3D scanning device, hyperspectral imager and 3D reconstruction device; The core feeding device is used to place the core and make the core perform reciprocating linear motion along a set path in the core feeding device according to control; The three-dimensional scanning device is used to scan the core performing positive linear motion to obtain a grayscale distribution image of the core; The hyperspectral imager is used to scan the core performing reverse linear motion to obtain reflectance spectrum data of the core; The three-dimensional reconstruction device is used to perform three-dimensional reconstruction on the core based on the grayscale distribution image to obtain a reconstructed three-dimensional structure of the core, and determine the type of at least one mineral included in the reconstructed three-dimensional structure and the content of the at least one mineral based on the reflectance spectrum data; The three-dimensional scanning device comprises: a turntable, an X-ray source and an X-ray detector arranged on one side of the turntable, and an electric slip ring arranged on the other side of the turntable; A through hole is provided in the middle of the turntable, and the set path of the core feeding device passes through the through hole; The electric slip ring is driven by the rotation of the turntable to provide control signals and power for the X-ray source and the X-ray detector; The X-ray source and the X-ray detector scan the core according to the control of the control signal to obtain a grayscale distribution image of the core.

6. The system according to claim 5, characterized in that The three-dimensional scanning device further includes: a base; The base is arranged at a set position away from the through hole, and is used to connect the X-ray source and the X-ray detector. The distance between the X-ray source and the X-ray detector is increased or decreased by the base to control the area of ​​interest detected by the three-dimensional scanning device.

7. The system according to claim 5, characterized in that The electric slip ring includes a stator and a rotor connected by a bearing. Both the stator and the rotor are hollow cylindrical structures with openings at both ends. After the rotor and the stator are fixed by docking, they are connected to the turntable through a transfer point based on a hexagonal screw and a locating pin.

8. The system according to any one of claims 5 to 7, characterized in that: The core feeding device comprises: a core support, a height adjustment mechanism, a linear movement adjustment mechanism, a support frame and a pressing block; The core support is used to place the core and provide a set path for the reciprocating linear motion of the core; The pressing block is arranged on the slider of the linear movement adjusting mechanism through the height adjusting mechanism, and the height of the pressing block can be adjusted through the height adjusting mechanism so that the central axis of the core on the core supporting member and the center of the through hole of the rotating disk are located at the same height; The support frame is used to provide support for the linear motion adjustment mechanism, and the hyperspectral imager is arranged directly above the end of the support frame.

9. The system according to any one of claims 5 to 7, characterized in that: Also includes: 3D visualization device; The three-dimensional visualization device is used to display the reconstructed three-dimensional structure.

10. The system according to any one of claims 5 to 7, characterized in that: Also includes: Core scanning database, hyperspectral database and reconstruction database; The core scanning database is used to store the grayscale distribution image of the core scanned by the three-dimensional scanning device; The hyperspectral database is used to store the reflectance spectrum data of the core scanned by the hyperspectral imager; The reconstructed volume database is used to store the reconstructed three-dimensional structure of the core obtained by the three-dimensional reconstruction device.

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