A near real-time transmission method for time-shifted seismic data based on seabed moorings

Abstract

This invention provides a near real-time transmission method for time-shifted seismic data based on seafloor moorings, comprising the following steps: Step 1: Deploying a seafloor mooring system on the seabed, including a mooring host computer, a PPB crystal oscillator, a four-component seismograph, and a mooring acoustic transmitter; Step 2: Deploying a seismic source system on the surface, including a surface host computer, a GPS beacon, an artificial seismic source, and a surface acoustic transmitter; Step 3: Adding a transmission protocol to the timestamps of a series of shot points excited at the same location at different times by the seismic source system and transmitting them to the mooring acoustic transmitter via the surface acoustic transmitter; Step 4: Verifying the correctness of the shot point timestamps by the mooring host computer; if correct, proceeding to Step 5; Step 5: Reading the shot point timestamps, extracting the seismic data, adding a communication protocol, and transmitting the seismic data to the surface acoustic transmitter via the mooring acoustic transmitter; Step 6: Verifying the correctness of the transmitted seismic data by the surface host computer; if correct, storing it on the surface host computer. This invention achieves near real-time transmission of time-shifted seismic data from seafloor moorings.

Description

Technical Field

[0001] This invention relates to the field of marine geophysical exploration technology, specifically to a near real-time transmission method for time-shifted seismic data based on seabed moorings. Background Technology

[0002] Submarine moorings, as important marine observation equipment, are widely used in marine earthquake monitoring and research. Time-lapse seismic technology, by repeatedly measuring seismic data of the same area, is used to monitor geological changes and the dynamic processes of underground fluids.

[0003] To achieve real-time data transmission, existing data transmission schemes for seabed moorings include cable transmission, electromagnetic waves, and acoustic communication. For deep-sea applications, cable transmission is costly and carries significant safety risks, while electromagnetic waves have short transmission distances. Acoustic communication is more feasible in comparison. However, the use of acoustic communication still faces many challenges. For instance, seismic data collected by deep-sea moorings is generally stored in situ and cannot be transmitted to the surface for processing in real time, making it difficult to meet the needs of real-time monitoring and early warning. Furthermore, the continuous acquisition and large volume of seismic data from seabed moorings, coupled with limited acoustic bandwidth and high error rates, restrict the application of acoustic communication. Summary of the Invention

[0004] In view of this, the present invention provides a near real-time transmission method for time-shifted seismic data based on seabed moorings, aiming to achieve near real-time transmission of time-shifted seismic data from seabed moorings.

[0005] This invention provides a near real-time transmission method for time-shifted seismic data based on a seabed mooring, comprising: Step 1, deploying a seabed mooring system, the seabed mooring system including a mooring host computer, a PPB crystal oscillator, a four-component seismograph, and a mooring acoustic transmitter; Step 2, deploying a seismic source system on the water surface, the seismic source system including a surface host computer, a GPS beacon, an artificial seismic source, and a surface acoustic transmitter; Step 3, transmitting a series of shot point timestamps from the same location at different times in the seismic source system, along with a transmission protocol, to the mooring acoustic transmitter via the surface acoustic transmitter; Step 4, transmitting the data through the mooring mooring system... The host computer verifies whether the timestamp of the shot point is correct. If correct, proceed to step 5 and return a file correct instruction; otherwise, return a file error instruction and repeat steps 3 and 4. Step 5: The host computer of the underwater mooring reads the timestamp of the shot point to extract seismic data and attach a communication protocol. The seismic data is then transmitted to the surface acoustic communication device via the underwater mooring acoustic communication device. Step 6: The host computer on the surface verifies whether the transmitted seismic data is correct. If correct, it is stored on the surface host computer and a file correct instruction is returned; otherwise, a file error instruction is returned and steps 5 and 6 are repeated.

[0006] In one implementation, the host computer of the submersible in step 1 is used for command transmission and reception and data processing and storage, the PPB crystal oscillator is used for submersible timing, the four-component seismograph is used for continuous acquisition of seismic data in time-shifted seismic operations, and the submersible acoustic communication device is used for acoustic communication.

[0007] In another implementation, the surface-mounted computer in step 2 is used for source control and command transmission and reception, data processing and storage; the GPS beacon is used to provide navigation and positioning information; the artificial earthquake source is used to generate seismic waves; the surface acoustic communication device is used for acoustic communication; and the source system generates seismic waves multiple times at the same location at different times during time-shifted seismic operations.

[0008] In another implementation, the series of gun point timestamps in step 3 adopts GTM timestamps, and the transmission protocol consists of three parts: hexadecimal communication instruction EB 90 0A F0 02, the series of gun point timestamps, and a two-byte CRC checksum.

[0009] In another implementation, step 4, which involves verifying the shot point timestamp via the underwater glider's host computer, includes: verifying the CRC checksum of the shot point timestamp with the attached communication protocol via the underwater glider's host computer; if correct, proceeding to step 5 and returning a file correct instruction; otherwise, returning a file error instruction and repeating steps 3 and 4.

[0010] In another implementation, step 5, which involves reading the shot point timestamps through the buoy's host computer to extract seismic data, includes: reading a series of shot point timestamps through the buoy's host computer and extracting four-component seismic data within 1 second to obtain time-shifted seismic data excited at the same location at different times.

[0011] In another implementation, the communication protocol in step 5 consists of three parts: the hexadecimal communication instruction EB 900AF5 09, the time-shifted seismic data, and a two-byte CRC checksum.

[0012] In another implementation, step 6, which involves verifying the correctness of the transmitted seismic data via the surface host computer, includes: verifying the correctness of the transmitted seismic data via the surface host computer; if correct, storing the seismic data on the surface host computer and returning a file correct instruction; otherwise, returning a file error instruction and repeating steps 5 and 6.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] (1) The present invention realizes near real-time transmission of time-shifted seismic data through acoustic communication method.

[0015] (2) This invention extracts specific seismic data by using shot point timestamps, which greatly compresses the amount of data to be transmitted and improves transmission efficiency.

[0016] (3) The communication protocol of the present invention is complete and includes CRC verification, and the system has higher stability and reliability. Attached Figure Description

[0017] Figure 1 This is a flowchart illustrating the steps of a near real-time transmission method for time-shifted seismic data based on a seabed mooring, according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the hardware configuration of the near real-time transmission method for time-shifted seismic data based on seabed moorings according to an embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] See Figure 1 , Figure 2 The specific steps of the near real-time transmission method for time-shifted seismic data based on seabed moorings according to embodiments of the present invention include:

[0021] Step 1: Deploy a seabed mooring system on the seabed. The seabed mooring system includes a mooring host computer, a PPB crystal oscillator, a four-component seismograph, and a mooring acoustic transmitter.

[0022] Step 2: Deploy a seismic source system on the water surface. The seismic source system includes a water surface host computer, a GPS beacon, an artificial seismic source, and a water surface acoustic transmitter.

[0023] Step 3: The timestamps of a series of shot points excited at the same location at different times in the source system are added with the transmission protocol and transmitted to the underwater buoy sonic transducer through the surface sonic transducer;

[0024] Step 4: Verify the shot point timestamp through the host computer of the underwater buoy. If it is correct, proceed to step 5 and return a file correct instruction. Otherwise, return a file error instruction and repeat steps 3 and 4.

[0025] Step 5: Read the timestamp of the shot point through the host computer of the underwater mooring to extract seismic data and attach the communication protocol, and transmit the seismic data to the surface acoustic communication device through the underwater mooring acoustic communication device;

[0026] Step 6: Verify the accuracy of the transmitted seismic data using the above-water computer. If the data is correct, store it on the above-water computer and return a file correct instruction; otherwise, return a file error instruction and repeat steps 5 and 6.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] (1) The present invention realizes near real-time transmission of time-shifted seismic data through acoustic communication method.

[0029] (2) This invention extracts specific seismic data by using shot point timestamps, which greatly compresses the amount of data to be transmitted and improves transmission efficiency.

[0030] (3) The communication protocol of the present invention is complete and includes CRC verification, and the system has higher stability and reliability.

[0031] Optionally, the host computer of the submersible in step 1 is used for command transmission and reception and data processing and storage, the PPB crystal oscillator is used for submersible timing, the four-component seismograph is used for continuous acquisition of seismic data in time-shifted seismic operations, and the submersible acoustic communication device is used for acoustic communication.

[0032] It should be understood that a PPB crystal oscillator is a PPB (one billionth) crystal oscillator.

[0033] Optionally, the surface host computer in step 2 is used for source control and command transmission and reception, data processing and storage; the GPS beacon is used to provide navigation and positioning information; the artificial earthquake source is used to generate seismic waves; the surface acoustic communication device is used for acoustic communication; and the source system generates the seismic waves multiple times at the same location at different times during time-shifted seismic operations.

[0034] Optionally, the series of timestamps for the firing points in step 3 uses GTM timestamps, and the transmission protocol consists of three parts: hexadecimal communication instruction EB 90 0A F0 02, the series of timestamps for the firing points, and a two-byte CRC checksum.

[0035] It should be understood that CRC checksum refers to Cyclic Redundancy Check. The transmission protocol consists of the hexadecimal communication instruction EB 90 0AF0 02, followed by a series of gun point timestamps, and then a two-byte CRC checksum.

[0036] It should be understood that a GTM timestamp refers to a timestamp expressed using Greenwich Mean Time (GMT), accurate to milliseconds, and formatted as an 8-byte integer.

[0037] Optionally, step 4, which involves verifying the shot point timestamp through the underwater mooring host computer, includes: verifying the CRC checksum of the shot point timestamp with the attached communication protocol through the underwater mooring host computer; if correct, proceeding to step 5 and returning a hexadecimal communication instruction EB 90 00 07 03 56 FD; otherwise, returning a hexadecimal communication instruction EB 90 00 07 04 E9 89, and repeating steps 3 and 4.

[0038] Optionally, step 5, which involves reading the shot point timestamps through the buoy's host computer to extract seismic data, includes: reading a series of shot point timestamps through the buoy's host computer and extracting four-component seismic data within 1 second to obtain time-shifted seismic data excited at the same location at different times.

[0039] Optionally, the communication protocol in step 5 consists of three parts: the hexadecimal communication instruction EB 90 0A F5 09, the time-shifted seismic data, and a two-byte CRC checksum.

[0040] It should be understood that the communication protocol consists of the hexadecimal communication instruction EB 90 0A F5 09, followed by time-shifted seismic data, and then a two-byte CRC checksum.

[0041] Optionally, step 6, which involves verifying the correctness of the transmitted seismic data via the surface host computer, includes: verifying the correctness of the transmitted seismic data via the surface host computer; if correct, storing the seismic data on the surface host computer and returning a hexadecimal communication instruction EB 90 00 07 05 60 98; otherwise, returning a hexadecimal communication instruction EB 90 00 07 06 FB AA, and repeating steps 5 and 6.

[0042] Compared with the prior art, the beneficial effects of the present invention are:

[0043] (1) The present invention realizes near real-time transmission of time-shifted seismic data through acoustic communication method.

[0044] (2) This invention extracts specific seismic data by using shot point timestamps, which greatly compresses the amount of data to be transmitted and improves transmission efficiency.

[0045] (3) The communication protocol of the present invention is complete and includes CRC verification, and the system has higher stability and reliability.

[0046] In summary, this invention provides a near real-time transmission method for time-shifted seismic data based on seabed moorings, achieving real-time, efficient, and reliable transmission of deep-sea seismic data. It solves many problems in the prior art and has broad application prospects and important practical value.

[0047] It should be noted that the present invention can be a method, system, apparatus, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of the present invention.

[0048] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example, but not limited to, electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0049] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0050] The computer program instructions used to perform the operations of this invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, Python, etc., and conventional procedural programming languages ​​such as "C" or similar languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of the invention.

[0051] Various aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0052] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0053] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0054] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions. It will be known to those skilled in the art that implementation in hardware, implementation in software, and implementation using a combination of software and hardware are equivalent.

[0055] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of the invention is defined by the appended claims.

Claims

1. A method for quasi-real-time transmission of time-lapse seismic data based on a seafloor node, characterized in that, The application relates to a time-lapse seismic operation method, which comprises the following steps: step 1, laying a subsea buoy system on the seabed, wherein the subsea buoy system comprises a subsea buoy host computer, a PPB crystal oscillator, a four-component seismic detector and a subsea acoustic communication device; the subsea buoy host computer is used for instruction transceiving and data processing storage; the PPB crystal oscillator is used for subsea buoy timing; the four-component seismic detector is used for continuously collecting seismic data in time-lapse seismic operation; and the subsea acoustic communication device is used for acoustic communication; step 2, laying a seismic source system on the water surface, wherein the seismic source system comprises a water surface host computer, a GPS beacon device, an artificial seismic source and a water surface acoustic communication device; the water surface host computer is used for seismic source control and instruction transceiving, data processing storage; the GPS beacon device is used for providing navigation positioning information; the artificial seismic source is used for exciting seismic waves; the water surface acoustic communication device is used for acoustic communication; and the seismic source system is used for exciting multiple times at the same position at different times in time-lapse seismic operation; step 3, transmitting a series of shot point time stamps excited at the same position at different times in the seismic source system to the subsea acoustic communication device through the water surface acoustic communication device by using a transmission protocol; the series of shot point time stamps adopt GTM time stamps; the transmission protocol comprises three parts of a hexadecimal communication instruction EB 9000AF002, the series of shot point time stamps and two-byte CRC check codes; step 4, verifying, by the subsea buoy host computer, whether the CRC check codes of the shot point time stamps with the transmission protocol are correct; if yes, performing step 5 and returning a hexadecimal communication instruction EB 9000070356FD; otherwise, returning a hexadecimal communication instruction EB 90000704E989 and repeatedly performing steps 3 and 4; step 5, reading, by the subsea buoy host computer, the shot point time stamps to extract seismic data and add a transmission protocol, and transmitting the seismic data to the water surface acoustic communication device through the subsea acoustic communication device; step 6, verifying, by the water surface host computer, whether the transmitted seismic data are correct; if yes, storing the seismic data in the water surface host computer and returning a file correct instruction; otherwise, returning a file error instruction and repeatedly performing steps 5 and 6. The step 5 of reading, by the subsea buoy host computer, the shot point time stamps to extract seismic data comprises the following steps: reading, by the subsea buoy host computer, a series of shot point time stamps to extract four-component seismic data within 1S, so as to obtain time-lapse seismic data excited at the same position at different times. The transmission protocol in step 5 comprises three parts of a hexadecimal communication instruction EB 9000AF509, the time-lapse seismic data and two-byte CRC check codes. The step 6 of verifying, by the water surface host computer, whether the transmitted seismic data are correct, storing the seismic data in the water surface host computer and returning a file correct instruction if yes, and returning a file error instruction and repeatedly performing steps 5 and 6 if no, comprises the following steps: verifying, by the water surface host computer, whether the transmitted seismic data are correct; if yes, storing the seismic data in the water surface host computer and returning a hexadecimal communication instruction EB 90000705 60 98; otherwise, returning a hexadecimal communication instruction EB 90000704E989 and repeatedly performing steps 5 and 6. ​ ​ ​ 2. The method of claim 1, wherein, ​ ​ 3. The method of claim 2, wherein, ​ 4. The method of claim 3, wherein, ​ ​ ​ Otherwise return the hex communication instruction EB 90 00 07 06 FB AA and repeat steps 5 and 6.

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