CN106251321A - For the method and apparatus obtaining rock fracture information - Google Patents
For the method and apparatus obtaining rock fracture information Download PDFInfo
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- CN106251321A CN106251321A CN201510321323.5A CN201510321323A CN106251321A CN 106251321 A CN106251321 A CN 106251321A CN 201510321323 A CN201510321323 A CN 201510321323A CN 106251321 A CN106251321 A CN 106251321A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
- G06T7/0008—Industrial image inspection checking presence/absence
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
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- G06T2207/30108—Industrial image inspection
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Abstract
It relates to rock physics field, disclose a kind of method and apparatus that can be used for and obtain rock fracture information.The method comprises the steps that the 3-D view that can obtain rock interior；Described 3-D view can be divided into multiple image daughter；Crack in each image daughter in recognizable the plurality of image daughter；And the plurality of image daughter can be combined by former order, and crack information analysis can be carried out based on identified crack.Rock internal fissure information exactly can be obtained according to the disclosure.
Description
Technical field
It relates to rock physics field, it is used for obtaining rock fracture information more particularly, to one
Method and apparatus.
Background technology
Needed for rock fracture information (such as fracture spacing etc.) is by rock physics numerical simulation study
Important parameter.At present about the acquisition of fracture spacing etc., it is mainly based upon the surface observation to rock specimens
With the observation appeared in stratum, field.The data such as the fracture spacing obtained accordingly are typically only capable to reflect bigger chi
The crack of degree (such as naked eyes are visible), the accuracy of information and comprehensive be short of.
Inventor finds through research, in order to efficiently realize exploring the energy and resource, the understanding earth
The purposes such as internal structure and motion, the prevention realizing geological disaster and mitigation, obtain the most accurate comprehensive
Rock fracture information is necessary.
Summary of the invention
The disclosure describes a kind of method that can obtain rock fracture information accurately.The disclosure also describes
Corresponding device.
One side according to the disclosure, it is proposed that a kind of method that can be used for obtaining rock fracture information.Should
Method comprises the steps that the 3-D view that can obtain rock interior；Described 3-D view can be divided into multiple figure
As daughter；Crack in each image daughter in recognizable the plurality of image daughter；And can be by former time
Sequence combines the plurality of image daughter, and can carry out crack information analysis based on identified crack.
According to another aspect of the present disclosure, it is proposed that a kind of device for obtaining rock fracture information, should
Device comprises the steps that acquiring three-dimensional images parts, can be used for obtaining the 3-D view of rock interior；Image is drawn
Sub-unit, can be used for being divided into described 3-D view multiple image daughter；Daughter crack identification parts,
Crack in each image daughter in recognizable the plurality of image daughter；And FRAC parts, can
Combine the plurality of image daughter by former order, and crack information analysis can be carried out based on identified crack.
Multiple projection pictures of rock interior can be obtained by CT scan, be then based on these projection pictures
Obtain the 3-D view of rock interior.
When identifying the crack in each image daughter, can shape facility based on hole (such as aspect ratio)
Etc. identifying wherein which hole may make up crack.Hole can be with pixel value picture in the range of intended pixel
Element is corresponding.
After former order combination (such as, splicing) multiple image daughters, can carry out according to certain criterion
Crack merges.Such as, by consistent for bearing of trend in identified crack and a plurality of splitting of linking together
It is a crack that seam re-recognizes.It is also based on the crack after re-recognizing and obtains predefined direction further
On the information such as fracture spacing.
By technique scheme, the 3-D view of rock interior can be divided into multiple image daughter, one by one
Analyze the crack situation of each daughter, then the whole 3-D view after combination is carried out further crack
Analyze, to obtain the crack information of the most comprehensively rock interior.Especially, in the disclosure, permissible
Obtain multiple projection picture by rock being carried out CT scan, and carry out image weight based on these projection pictures
Structure is to obtain reflecting the 3-D view of rock interior situation.
Accompanying drawing explanation
By combining accompanying drawing, disclosure illustrative embodiments is described in more detail, the disclosure upper
State and other purpose, feature and advantage will be apparent from, wherein, in the exemplary enforcement of the disclosure
In mode, identical reference number typically represents same parts.
Fig. 1 shows the exemplary computer system/server 12 be suitable to for realizing disclosure embodiment
Block diagram.
Fig. 2 is the flow process of the method for obtaining rock fracture information of an embodiment according to the disclosure
Figure.
Fig. 3 is the different directions of the 3-D view of the rock interior that an embodiment according to the disclosure obtains
Sectional drawing.
Fig. 4 is the signal of the device for obtaining rock fracture information of an embodiment according to the disclosure
Figure.
Detailed description of the invention
It is more fully described the preferred implementation of the disclosure below with reference to accompanying drawings.Although accompanying drawing shows
The preferred implementation of the disclosure, however, it is to be appreciated that may be realized in various forms the disclosure and not
Should be limited by embodiments set forth herein.On the contrary, it is provided that these embodiments are to make the disclosure
More thorough and complete, and the scope of the present disclosure intactly can be conveyed to those skilled in the art.
Fig. 1 shows the exemplary computer system/server 12 be suitable to for realizing disclosure embodiment
Block diagram.The computer system/server 12 that Fig. 2 shows is only an example, should be to the disclosure
The function of embodiment and range bring any restriction.
As in figure 2 it is shown, computer system/server 12 shows with the form of universal computing device.Calculate
The assembly of machine systems/servers 12 can include but not limited to: one or more processor or process
Unit 16, system storage 28, connect different system assembly and (include system storage 28 and process single
First 16) bus 18.
Bus 18 represents one or more in a few class bus structures, including memory bus or memorizer
Controller, peripheral bus, AGP, processor or use in multiple bus structures any
Bus-structured local bus.For example, these architectures include but not limited to Industry Standard Architecture
Structure (ISA) bus, MCA (MAC) bus, enhancement mode isa bus, video
Frequency electronic standard association (VESA) local bus and periphery component interconnection (PCI) bus.
Computer system/server 12 typically comprises various computing systems computer-readable recording medium.These media
Can be any usable medium that can be accessed by computer system/server 12, including volatibility and non-
Volatile media, moveable and immovable medium.
System storage 28 can include the computer system-readable medium of form of volatile memory, such as
Random access memory (RAM) 30 and/or cache memory 32.Computer system/server 12
May further include that other is removable/nonremovable, the storage of volatile/non-volatile computer system is situated between
Matter.Being only used as citing, storage system 34 may be used for reading and writing immovable, non-volatile magnetic media (figure
2 do not show, commonly referred to " hard disk drive ").Although not shown in Fig. 2, it is provided that for can
The disc driver that mobile non-volatile magnetic disk (such as " floppy disk ") is read and write, and to removable non-volatile
The CD drive that property CD (such as CD-ROM, DVD-ROM or other light medium) is read and write.
In these cases, each driver can pass through one or more data media interfaces and bus 18 phase
Even.Memorizer 28 can include at least one program product, and this program product has one group (for example, at least
One) program module, these program modules are configured to perform the function of each embodiment of the disclosure.
There is the program/utility 40 of one group of (at least one) program module 42, example can be stored in
In memorizer 28, such program module 42 include but not limited to operating system, one
Or multiple application programs, other program module and routine data, in these examples each or certain
Plant the realization potentially including network environment in combination.Program module 42 generally performs the reality described by the disclosure
Execute the function in example and/or method.
Computer system/server 12 (such as keyboard, can also refer to one or more external equipment 14
To equipment, display 24 etc.) communication, also can enable a user to and this department of computer science with one or more
The equipment communication that system/server 12 is mutual, and/or with make this computer system/server 12 can be with one
Any equipment (such as network interface card, modem etc.) that other calculating equipment individual or multiple communicate
Communication.This communication can be passed through input/output (I/O) interface 22 and carry out.Further, computer system/
Server 12 can also by network adapter 20 and one or more network (such as LAN (LAN),
Wide area network (WAN) and/or public network, such as the Internet) communication.As it can be seen, network adapter
20 are communicated with other module of computer system/server 12 by bus 18.Although it should be understood that figure
Not shown in 2, other hardware and/or software module can be used in conjunction with computer system/server 12,
Include but not limited to: microcode, device driver, redundant processing unit, external disk driving array,
RAID system, tape drive and data backup storage system etc..
Present disclosure discloses a kind of method that can be used for obtaining rock fracture information.The method comprises the steps that can
Obtain the 3-D view of rock interior；Described 3-D view can be divided into multiple image according to predetermined direction
Daughter；Crack in each image daughter in recognizable the plurality of image daughter；And can be by former order
Combine the plurality of image daughter, and crack information analysis can be carried out based on identified crack.
Embodiment 1
Fig. 2 is the flow process of the method for obtaining rock fracture information of an embodiment according to the disclosure
Figure.In this embodiment, the method can comprise the following steps that
Step S201, can obtain the 3-D view of rock interior.
Such as, rock can be carried out CT scan to obtain multiple projection pictures of rock interior, be then based on
The plurality of projection picture carries out three-dimensionalreconstruction, to obtain the 3-D view of rock interior.
Rock can measured the section of rock interior in the case of lossless to obtain projection by CT scan
Picture, the pixel value in projection picture can reflect the information such as the Density Distribution of section material.These can be projected
Image imports existing CT 3-D view reconstruction software (such as VGstudio) etc., to obtain rock interior
3-D view.The 3-D view directly obtained can be three dimensional grey scale image, can be according to demand by its turn
It is changed to three-dimensional binary image.
Any technological means known maybe can also be obtained in rock by those skilled in the art by known
The 3-D view in portion.
Step S202, is divided into multiple image daughter by the 3-D view of acquisition.
Inventor finds through research, if the direct whole 3-D view using acquisition is as object at the beginning
Carrying out crack identification, then need to process substantial amounts of redundant data, final result can be done by very many
Disturbing the impact of data, amount of calculation is huge and affects accuracy.Therefore, the 3-D view that inventor will obtain
It is divided into multiple image daughter and respectively it is carried out initial treatment, being greatly improved computational efficiency, also may be used
Improve accuracy in computation.
Such as, three will be able to obtained according to predetermined direction (being such as perpendicular to the direction on rock sample ground)
Dimension image division is multiple image daughters.
Step S203, the crack in each image daughter in recognizable multiple image daughters.
Such as, crack can be identified based on the aspect ratio of the hole in image daughter, such as, can be by length and breadth
Ratio is identified as crack more than the hole of predetermined aspect ratio thresholds.The ratio of the length and width of aspect ratio finger-hole gap,
Generally when certain angle is observed, hole can be considered oval, and " aspect ratio " of hole can in this case
The ratio of the major axis of finger-hole gap axle short with hole.
Hole can be corresponding with pixel value pixel in the range of intended pixel.Such as, can set in image
The gray value of background pixel is set to standard pixel (such as " 0 "), by certain for criterion distance pixel deviation model
Enclose interior pixel and be identified as hole.This intended pixel scope can rule of thumb be arranged, can be from
Image extracts, it is also possible to obtained by training.Hole can be determined before dividing image daughter,
Also hole can be determined after dividing image daughter.
Hole can be determined based on three dimensional grey scale image, then three dimensional grey scale image is converted to " hole " and
The three-dimensional binary image of " non-hole " (or " rock matrix "), and the base in this three-dimensional binary image
On plinth, shape facility based on hole (such as aspect ratio) identifies crack.
As required, can only identify bearing of trend crack on certain or some directions, and/or can revise
Above-mentioned predetermined aspect ratio thresholds adjusts the criterion in crack.
Any technological means known maybe can also be identified each figure by known by those skilled in the art
As the crack in daughter.
Step S204, can be combined the multiple image daughters obtained after (such as splicing) divides by former order,
And crack information analysis can be carried out based on identified crack.
After multiple image daughters are combined, can re-recognize by fracture.Such as, can will know
In other crack, bearing of trend crack that is consistent and that link together re-recognizes is a crack.Can be by
Crack after re-recognizing is applied to follow-up crack information analysis and rock numerical modeling etc..As required,
The crack arranged with some bearing of trend can be concerned only with, such as, be parallel to layer reason direction, be perpendicular to layer reason side
To and with layer reason direction be the directions such as 45° angle direction.
Further, the information such as the fracture spacing that can get in whole 3-D view on predefined direction.
Such as, the crack quantity that can be arranged the most in the direction, by this crack quantity divided by rock in the direction
Length to obtain fracture spacing.Additionally, it will be appreciated by persons skilled in the art that according to the disclosure,
Information such as same available multiple crack such as such as fracture length, crevice volume etc..
Shown below is the concrete example obtaining rock fracture information according to the present embodiment.This example
It is only used for the disclosure illustrative, and limits the protection domain of the disclosure never in any form.
In this example, the sample of selection is cylindric coal petrography sample, high 8.75cm, diameter 4.96cm.At phoenix
On v | tome | max type industry CT instrument, sample is carried out X-ray scanning.Sweep parameter is as follows:
Scanning voltage: 140KV；Sweep current: 140 μ A；
Precision: 27 μm；
Sweep time: 120min.
The data that obtain of experiment are transfused to VGStudio software to carry out 3-D view reconstruct, whole to obtain
The microscopic feature of sample.Fig. 3 shows the 3-D view that obtains in this example sectional drawing along different directions.
In VGStudio software, image background gray value is set to standard pixel (such as " 0 "), simultaneously
From Fig. 3 (a), extract the gray value (such as " 52 ") in sample interior crack, determine hole by being used for
Intended pixel scope is set to 0-52.Extract the pixel work meeting this intended pixel scope in 3-D view
For hole.Then 3-D view is divided into multiple image daughter, identifies the crack in each image daughter,
Combine these image daughters by former order again, and identified is positioned at the extension side in different images daughter
Re-recognizing to crack that is consistent and that link together is a crack.After fracture carries out preliminary analysis,
Obtain such as the data of table 1:
Table 1: crack count table
Table 1 shows and is being parallel to layer reason direction and the crack count being perpendicular on layer reason direction.According to system
Meter result, the crack along layer reason direction has 16, and its fracture spacing is about 1.83/centimetre；Vertical stratification
The crack in direction has 19, and its fracture spacing is about 3.83/centimetre.
The disclosure also discloses a kind of device for obtaining rock fracture information, and this device comprises the steps that three
Dimension image acquisition component, can be used for obtaining the 3-D view of rock interior；Image division parts, can be used for
Described 3-D view is divided into multiple image daughter；Daughter crack identification parts, recognizable the plurality of
Crack in each image daughter in image daughter；And FRAC parts, institute can be combined by former order
State multiple image daughter, and crack information analysis can be carried out based on identified crack.
Embodiment 2
Fig. 4 is the signal of the device for obtaining rock fracture information of an embodiment according to the disclosure
Figure.Device according to this embodiment includes acquiring three-dimensional images parts 401, image division parts 402, son
Body crack identification parts 403 and FRAC parts 404.
Acquiring three-dimensional images parts 401 can obtain the 3-D view of rock interior.Such as, acquiring three-dimensional images
Parts 401 can carry out three-dimensionalreconstruction by multiple projection pictures based on the rock interior obtained by CT scan, with
3-D view to rock interior.
It is multiple that described 3-D view can be divided (such as, according to predetermined direction) by image division parts 402
Image daughter.
Daughter crack identification parts 403 can recognize that the crack in each image daughter.Such as, daughter crack is known
Other parts 403 can identify crack based on the aspect ratio of the hole in image daughter.Such as, hole can be with picture
Element value pixel in the range of intended pixel is corresponding.
FRAC parts 404 can combine the plurality of image daughter by former order, and can be based on identified
Crack carries out crack information analysis.Such as, FRAC parts 404 can be by the extension in identified crack
It is a crack that crack that is consistent and that link together, direction re-recognizes.Then, such as, crack is divided
Crack quantity that analysis parts 404 can obtain on predefined direction based on the crack after re-recognizing, volume,
The information such as length and fracture spacing.
The disclosure can be method, device and/or computer program.Computer program can wrap
Include computer-readable recording medium, containing by making processor realize based on various aspects of the disclosure
Calculation machine readable program instructions.
Computer-readable recording medium can be to keep and to store the instruction used by instruction execution equipment
Tangible device.Computer-readable recording medium such as may be-but not limited to-storage device electric,
Magnetic storage apparatus, light storage device, electromagnetism storage device, semiconductor memory apparatus or above-mentioned any
Suitably combination.The more specifically example (non exhaustive list) of computer-readable recording medium includes:
Portable computer diskette, hard disk, random access memory (RAM), read only memory (ROM), erasable
Formula programmable read only memory (EPROM or flash memory), static RAM (SRAM), portable
Formula compact disk read only memory (CD-ROM), digital versatile disc (DVD), memory stick, floppy disk, machinery
Encoding device, such as storage has the punch card of instruction or groove internal projection structure and above-mentioned appointing on it
Meaning suitably combination.Computer-readable recording medium used herein above is not construed as instantaneous signal itself,
The electromagnetic wave of such as radio wave or other Free propagations, propagated by waveguide or other transmission mediums
Electromagnetic wave (such as, by the light pulse of fiber optic cables) or by the signal of telecommunication of wire transfer.
Computer-readable program instructions as described herein can download to each from computer-readable recording medium
Calculating/processing equipment, or by network, such as the Internet, LAN, wide area network and/or wireless network
Download to outer computer or External memory equipment.Network can include copper transmission cable, fiber-optic transfer,
Be wirelessly transferred, router, fire wall, switch, gateway computer and/or Edge Server.Each meter
Adapter or network interface in calculation/processing equipment receive computer-readable program instructions from network,
And forward this computer-readable program instructions, can for the computer being stored in each calculating/processing equipment
Read in storage medium.
Can be assembly instruction, instruction set architecture for performing the computer program instructions of disclosure operation
(ISA) instruction, machine instruction, machine-dependent instructions, microcode, firmware instructions, condition setup data,
Or the source code write with the combination in any of one or more programming languages or object code, described programming
Language includes OO programming language such as Smalltalk, C++ etc., and the process type of routine
Programming language such as " C " language or similar programming language.Computer-readable program instructions can be complete
Ground performs on the user computer, performs the most on the user computer, as an independent software
Bag performs, performs the most on the remote computer or remotely counting completely
Perform on calculation machine or server.In the situation relating to remote computer, remote computer can be by appointing
The network of meaning kind includes that LAN (LAN) or wide area network (WAN) are connected to subscriber computer, or,
May be coupled to outer computer (such as utilizing ISP to pass through Internet connection).?
In some embodiments, carry out personalized customization electronics by the status information utilizing computer-readable program instructions
Circuit, such as Programmable Logic Device, field programmable gate array (FPGA) or programmable logic array
(PLA), this electronic circuit can perform computer-readable program instructions, thus realizes each of the disclosure
Aspect.
Referring herein to the method according to disclosure embodiment, device (system) and computer program
Flow chart and/or block diagram describe various aspects of the disclosure.Should be appreciated that flow chart and/or block diagram
In each square frame and flow chart and/or block diagram, the combination of each square frame, can be referred to by computer-readable program
Order realizes.
These computer-readable program instructions can be supplied to general purpose computer, special-purpose computer or other can
The processor of programming data processing means, thus produce a kind of machine so that these instructions are by meter
When the processor of calculation machine or other programmable data processing means performs, create flowchart and/or frame
The device of the function/action of regulation in one or more square frames in figure.Can also be these computer-readables
Programmed instruction stores in a computer-readable storage medium, and these instructions make computer, programmable data
Processing means and/or other equipment work in a specific way, thus, storage has the computer-readable of instruction to be situated between
Matter then includes a manufacture, and it includes advising in the one or more square frames in flowchart and/or block diagram
The instruction of the various aspects of fixed function/action.
Can also computer-readable program instructions be loaded into computer, other programmable data processing means,
Or on miscellaneous equipment so that perform on computer, other programmable data processing means or miscellaneous equipment
Sequence of operations step, to produce computer implemented process, so that at computer, other can compile
On journey data processing equipment or miscellaneous equipment perform instruction flowchart and/or block diagram in one or
Function/the action of regulation in multiple square frames.
Flow chart in accompanying drawing and block diagram show the system of multiple embodiments according to the disclosure, method and
Architectural framework in the cards, function and the operation of computer program.In this, flow chart or
Each square frame in block diagram can represent a module, program segment or a part for instruction, described module,
A part for program segment or instruction comprise one or more for realize regulation logic function perform refer to
Order.At some as in the realization replaced, the function marked in square frame can also be to be different from accompanying drawing
The order marked occurs.Such as, two continuous print square frames can essentially perform substantially in parallel, it
Sometimes can also perform in the opposite order, this is depending on involved function.It is also noted that
The combination of the square frame in each square frame in block diagram and/or flow chart and block diagram and/or flow chart, can
Realize with the special hardware based system by the function or action performing regulation, or can be with specially
Realize with the combination of hardware with computer instruction.
Being described above the presently disclosed embodiments, described above is exemplary, and non-exclusive
, and it is also not necessarily limited to disclosed each embodiment.Without departing from illustrated each embodiment scope and
In the case of spirit, many modifications and changes are all aobvious for those skilled in the art
And be clear to.The selection of term used herein, it is intended to explain the principle of each embodiment, reality best
Application or the technological improvement to the technology in market, or make other those of ordinary skill of the art
It is understood that each embodiment disclosed herein.
Claims (10)
1., for the method obtaining rock fracture information, the method includes:
Obtain the 3-D view of rock interior；
Described 3-D view is divided into multiple image daughter；
Identify the crack in each image daughter in the plurality of image daughter；And
Combine the plurality of image daughter by former order, and carry out crack information based on identified crack and divide
Analysis.
Method the most according to claim 1, wherein, the 3-D view obtaining rock interior includes:
Rock is carried out CT scan to obtain multiple projection pictures of rock interior；And
Three-dimensionalreconstruction is carried out, to obtain the 3-D view of rock interior based on the plurality of projection picture.
Method the most according to claim 1, wherein, identifies each figure in the plurality of image daughter
As the crack in daughter includes:
Aspect ratio based on the hole in image daughter identifies crack.
Method the most according to claim 3, wherein, described hole and pixel value are at intended pixel model
Enclose interior pixel corresponding.
Method the most according to claim 1, wherein, carries out crack information based on identified crack
Analysis includes:
It is one that crack that is bearing of trend in identified crack is consistent and that link together re-recognizes
Crack.
Method the most according to claim 5, wherein, carries out crack information based on identified crack
Analyze and also include:
The fracture spacing on predefined direction is obtained based on the crack after re-recognizing.
7., for obtaining a device for rock fracture information, this device includes:
Acquiring three-dimensional images parts, for obtaining the 3-D view of rock interior；
Image division parts, for being divided into multiple image daughter by described 3-D view；
Daughter crack identification parts, identify the crack in each image daughter in the plurality of image daughter；
And
FRAC parts, combine the plurality of image daughter by former order, and based on identified crack
Carry out crack information analysis.
Device the most according to claim 7, wherein, the 3-D view obtaining rock interior includes:
Described acquiring three-dimensional images parts multiple projection pictures based on the rock interior obtained by CT scan
Carry out three-dimensionalreconstruction, to obtain the 3-D view of rock interior.
Device the most according to claim 7, wherein, identifies each figure in the plurality of image daughter
As the crack in daughter includes:
Described daughter crack identification parts aspect ratio based on the hole in image daughter identifies crack.
Device the most according to claim 7, wherein, carries out crack letter based on identified crack
Breath analysis includes:
Described FRAC parts are by consistent for bearing of trend in identified crack and splitting of linking together
It is a crack that seam re-recognizes.
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| CN106988739B (en) * | 2017-05-19 | 2020-05-22 | 中国石油集团川庆钻探工程有限公司 | Shale reservoir fracturing fracture identification and interpretation evaluation method |
| CN109163970A (en) * | 2018-10-21 | 2019-01-08 | 东北石油大学 | Scan the compact reservoir compressibility evaluation method for determining fractured rock flaw area |
| CN111311559A (en) * | 2020-02-07 | 2020-06-19 | 中国石油大学(华东) | Non-deviation crack characterization method |
| CN111311559B (en) * | 2020-02-07 | 2022-06-14 | 中国石油大学(华东) | Non-deviation crack characterization method |
| CN111220482A (en) * | 2020-03-05 | 2020-06-02 | 中国石油大学(北京) | Rock micro-crack propagation simulation method, device, equipment and storage medium |
| CN116183875A (en) * | 2023-04-21 | 2023-05-30 | 煤炭科学研究总院有限公司 | Rock mass wave velocity determination method and device and electronic equipment |
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