Marine integrated pull-type multi-source fusion broadband seismic source system

Abstract

The invention discloses a marine integrated pull-type multi-source fusion broadband seismic source system, relates to the field of marine geophysical exploration, and aims to solve the problems of poor stability, complex operation and narrow frequency band of a single seismic source during collaborative operation of multiple seismic sources. According to the scheme, a low-frequency electromagnetic vibration exciter, a medium-frequency electric spark unit and a high-frequency piezoelectric ceramic array are integrated in a streamline dragging cabin, and high-precision synchronous excitation and self-adaptive energy management of all the units in the dragging state are achieved through a built-in central integrated control system and a shared power supply data transmission system. The integrated towing body is connected with a mother ship through a single armored cable, radiates broadband composite seismic wave signals of 100 Hz to 10 kHz, and is used for seabed high-resolution seismic exploration.

Description

Technical Field

[0001] This invention belongs to the field of marine geophysical exploration technology, and in particular relates to an integrated towed multi-source fusion broadband seismic source system for marine applications. Background Technology

[0002] Marine seismic exploration is a key technology for obtaining information on seabed geological structures. Currently, the mainstream seismic source in this field is the air gun, which has the advantages of high energy and deep penetration. However, its excitation signal spectrum is mainly concentrated below 200 Hz, with a severe lack of high-frequency components, making it difficult to meet the requirements for high-resolution imaging of shallow seabed strata. To obtain higher frequency signals, electric spark or Boomer seismic sources are also used in practice. Although these sources can provide higher frequency components, their low-frequency energy is weak, their effective bandwidth is narrow, and their excitation stability and repeatability are poor. Therefore, existing single-type seismic sources have limitations in their physical principles, and cannot provide balanced and sufficient energy in a wide frequency range from 100 Hz to 10,000 Hz, making it difficult to simultaneously achieve the dual technical goals of "deep penetration" and "high resolution" in exploration operations.

[0003] With the deepening of marine resource development and underwater engineering construction, the demand for detailed detection of shallow seabed structures is increasing. For example, the precise detection of geological targets such as buried pipelines, landslides, and shallow gas requires seismic sources that can provide stable signals with wider frequency band coverage, especially those containing effective high-frequency components in the thousands of hertz. To broaden the frequency band, existing technologies attempt to combine seismic sources based on different principles, i.e., multi-source seismic exploration. However, traditional combination methods typically deploy low-frequency, mid-frequency, and high-frequency seismic sources as independent devices, such as by towing different towed bodies or performing hoisting operations. This discrete operation mode has a series of inherent drawbacks in practical marine applications. First, the relative spatial positions of the seismic sources cannot be fixed. As the exploration vessel navigates and ocean currents influence the data, the towed bodies or hoisting points of each source will oscillate relative to each other. This causes the interference and synthesis waveforms of the excited sound waves to constantly change when superimposed in the far field, severely damaging the consistency and repeatability of seismic data and posing significant difficulties for subsequent data processing and interpretation. Secondly, this model requires each seismic source to be independently equipped with tow cables, control systems, and shipboard deck support equipment, making the deployment and retrieval operations cumbersome and complex, significantly increasing operation time and labor costs, and reducing overall exploration efficiency. Finally, multiple independent cables and control systems also result in complex and bulky shipboard equipment, leading to high purchase and maintenance costs. These engineering challenges arising from the physical deployment method have long hindered the large-scale practical application of broadband multi-source fusion exploration technology. Therefore, the industry urgently needs a new integrated solution that can fundamentally ensure the relative stability of multiple seismic sources and significantly simplify the operation process. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes an integrated towed multi-source fusion broadband seismic source system for marine applications, thereby resolving the issues present in the prior art.

[0005] In a first aspect, to achieve the above objectives, the present invention provides a method for a marine integrated towed multi-source fusion broadband seismic source, comprising the following steps:

[0006] The streamlined towing hull, which integrates a low-frequency electromagnetic exciter, a medium-frequency electrical spark unit, and a high-frequency piezoelectric ceramic array, is connected to the mother ship via a single armored towing cable for towing operations.

[0007] The streamlined towed hull is powered and data communication is established via the tow cable;

[0008] Real-time acquisition of the towing attitude data of the streamlined towing hull;

[0009] Based on the towing attitude data, the low-frequency electromagnetic vibrator, the medium-frequency electric spark unit, and the high-frequency piezoelectric ceramic array are synchronously driven by the central integrated control system in the cabin to generate sound waves of different frequency bands.

[0010] The sound waves of different frequency bands are radiated into the water through the corresponding acoustic channels on the streamlined towed hull, so that they are fused in the far field to form a broadband composite seismic wave signal.

[0011] Optional, the internal integration process for the streamlined tow hull includes:

[0012] The low-frequency electromagnetic vibrator is fixedly installed at the center of gravity of the front part of the cabin, and its vibration plate is coupled to the large-area sound-permeable membrane at the bottom of the cabin.

[0013] The discharge electrodes of the intermediate frequency electric spark unit are arranged in an open or semi-open cavity at the rear of the cabin.

[0014] The high-frequency piezoelectric ceramic array is embedded in the surface of the cabin in the form of an acoustic panel.

[0015] Optionally, the process of synchronously driving the low-frequency electromagnetic exciter includes:

[0016] The central integrated control system sends a drive signal to control the movement of the vibrating plate of the electromagnetic vibrator, so that it generates sound waves with a frequency band covering 100Hz to 500Hz, which are then radiated through the sound-permeable membrane.

[0017] Optionally, the process of synchronously driving the intermediate frequency electrical discharge unit includes:

[0018] The central integrated control system triggers a pulse switch, causing the high-voltage energy storage capacitor bank to discharge instantaneously through the discharge electrode, generating plasma bubbles, which in turn excite sound waves covering a frequency band of 500Hz to 3kHz.

[0019] Optionally, the process of synchronously driving the high-frequency piezoelectric ceramic array includes:

[0020] The central integrated control system transmits coded electrical signals to the high-frequency piezoelectric ceramic array, driving the array to vibrate and generate sound waves with a frequency band covering 2kHz to 10kHz, which are then radiated through the acoustic panel.

[0021] Optionally, the process of synchronously driving each unit through a central integrated control system based on towing attitude data includes:

[0022] The central integrated control system receives real-time data from the towing attitude sensing module integrated therein.

[0023] Based on the depth, undulation, and sway information contained in the real-time data, the timing of the excitation control signals sent to each seismic source unit is adjusted.

[0024] Secondly, the present invention also provides a marine integrated towed multi-source fusion broadband seismic source system for implementing a marine integrated towed multi-source fusion broadband seismic source method, the system comprising:

[0025] The integrated towed hull module integrates a low-frequency electromagnetic excitation unit, a medium-frequency electric spark unit, and a high-frequency piezoelectric ceramic array unit.

[0026] The mother ship interface and towing module are connected to the integrated towing hull module and the mother ship via a single armored towing cable, which is used to provide power and establish data communication.

[0027] An attitude perception and synchronization control module is located inside the integrated towing hull module. It is used to acquire towing attitude data in real time and synchronously drive the low-frequency electromagnetic excitation unit, the medium-frequency electric spark unit and the high-frequency piezoelectric ceramic array unit based on the attitude data.

[0028] The acoustic radiation fusion module consists of multiple acoustic channels disposed on the surface of the integrated towed hull module, which are used to radiate different frequency bands of acoustic waves generated by each unit into the water, so as to fuse them in the far field to form a broadband composite seismic wave signal.

[0029] Thirdly, the present invention also provides a computer terminal device, comprising:

[0030] One or more processors;

[0031] A memory, coupled to the processor, for storing one or more programs;

[0032] When the one or more programs are executed by the one or more processors, the one or more processors implement the steps of the above-described first aspect of the marine integrated towed multi-source fusion broadband seismic source method.

[0033] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, it implements the steps of the above-described integrated towed multi-source fusion broadband seismic source method for marine applications in the first aspect.

[0034] Fifthly, the present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described integrated towed multi-source fusion broadband seismic source method for marine applications in the first aspect.

[0035] Compared with the prior art, the present invention has the following advantages and technical effects:

[0036] This invention provides an integrated towed multi-source fusion broadband seismic source system for marine applications. This system integrates seismic source units of different frequency bands into a single towed hull and connects to the mother ship via a single armored cable, achieving integrated single-cable operation. This greatly simplifies the deployment and recovery process at sea and improves exploration efficiency. The integrated, fixed internal structure ensures the geometric stability of the relative positions of each seismic source unit, enabling the generated acoustic waves to form stable and predictable synthetic waveforms in the far field, significantly improving the consistency and repeatability of seismic data. The streamlined hull design reduces fluid resistance and eddy noise during underwater towing, which is beneficial for maintaining platform stability and acoustic performance at high towing speeds. Furthermore, the built-in central integrated control system possesses attitude perception and adaptive management capabilities, making this towed body an intelligent and reliable underwater acoustic detection platform, enhancing the overall stability and reliability of the system. Attached Figure Description

[0037] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0038] Figure 1 This is an external three-dimensional isometric view of the integrated marine towing hull according to an embodiment of the present invention;

[0039] Figure 2 This is a cross-sectional view of the internal structure of the integrated marine towing hull according to an embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram illustrating the connection between the system and the mother ship according to an embodiment of the present invention;

[0041] Figure 4 This is a timing control and data flow diagram of each seismic source unit inside the cabin according to an embodiment of the present invention;

[0042] Figure 5 This is a scene diagram of the system of the present invention being towed behind a ship, according to an embodiment of the present invention. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0045] This invention discloses an integrated towed multi-source fusion broadband seismic source system for marine applications, aiming to provide a plug-and-play, easy-to-use high-resolution seismic exploration solution for offshore operations. The system innovatively integrates a low-frequency electromagnetic exciter unit (100-500Hz), a medium-frequency electrical spark unit (500Hz-3kHz), and a high-frequency piezoelectric ceramic array unit (2kHz-10kHz) into a streamlined, watertight towed hull. Through a built-in central integrated control system and a shared power supply and data transmission system, high-precision synchronous excitation and adaptive energy management of the three units are achieved during towed operation. This integrated towed body connects to the mother ship via a single armored cable, greatly simplifying deployment and retrieval operations and ensuring the stability of the relative position of the seismic sources, thereby generating stable and controllable 100Hz to 10kHz ultra-wideband seismic wave signals.

[0046] Example 1

[0047] This embodiment provides a method for a marine integrated towed multi-source fusion broadband seismic source, including:

[0048] The streamlined towing hull, which integrates a low-frequency electromagnetic exciter, a medium-frequency electrical spark unit, and a high-frequency piezoelectric ceramic array, is connected to the mother ship via a single armored towing cable for towing operations.

[0049] The streamlined towed hull is powered and data communication is established via the tow cable;

[0050] Real-time acquisition of the towing attitude data of the streamlined towing hull;

[0051] Based on the towing attitude data, the low-frequency electromagnetic vibrator, the medium-frequency electric spark unit, and the high-frequency piezoelectric ceramic array are synchronously driven by the central integrated control system in the cabin to generate sound waves of different frequency bands.

[0052] The sound waves of different frequency bands are radiated into the water through the corresponding acoustic channels on the streamlined towed hull, so that they are fused in the far field to form a broadband composite seismic wave signal.

[0053] As one implementation method in this embodiment, the internal integration process of the streamlined towing hull includes:

[0054] The low-frequency electromagnetic vibrator is fixedly installed at the center of gravity of the front part of the cabin, and its vibration plate is coupled to the large-area sound-permeable membrane at the bottom of the cabin.

[0055] The discharge electrodes of the intermediate frequency electric spark unit are arranged in an open or semi-open cavity at the rear of the cabin.

[0056] The high-frequency piezoelectric ceramic array is embedded in the surface of the cabin in the form of an acoustic panel.

[0057] As one implementation method in this embodiment, the process of synchronously driving the low-frequency electromagnetic exciter includes:

[0058] The central integrated control system sends a drive signal to control the movement of the vibrating plate of the electromagnetic vibrator, so that it generates sound waves with a frequency band covering 100Hz to 500Hz, which are then radiated through the sound-permeable membrane.

[0059] As one implementation method in this embodiment, the process of synchronously driving the intermediate frequency electric spark unit includes:

[0060] The central integrated control system triggers a pulse switch, causing the high-voltage energy storage capacitor bank to discharge instantaneously through the discharge electrode, generating plasma bubbles, which in turn excite sound waves covering a frequency band of 500Hz to 3kHz.

[0061] As one implementation method in this embodiment, the process of synchronously driving the high-frequency piezoelectric ceramic array includes:

[0062] The central integrated control system transmits coded electrical signals to the high-frequency piezoelectric ceramic array, driving the array to vibrate and generate sound waves with a frequency band covering 2kHz to 10kHz, which are then radiated through the acoustic panel.

[0063] As one implementation method in this embodiment, the process of synchronously driving each unit through a central integrated control system based on towing attitude data includes:

[0064] The central integrated control system receives real-time data from the towing attitude sensing module integrated therein.

[0065] Based on the depth, undulation, and sway information contained in the real-time data, the timing of the excitation control signals sent to each seismic source unit is adjusted.

[0066] Specifically, it includes:

[0067] A streamlined, integrated towing hull, internally incorporating:

[0068] 1. Low-frequency source unit:

[0069] Type: Electromagnetic exciter.

[0070] Integrated design: Due to its large weight and volume, it is fixedly installed at the front center of gravity of the hull, serving as part of the ballast and stabilizing structure of the entire towed body. Its vibrating plate is coupled to a large-area acoustically permeable membrane at the bottom of the hull, radiating sound waves towards the seabed.

[0071] 2. Mid-frequency source unit:

[0072] Type: Electric spark source.

[0073] Integrated design: Its high-voltage energy storage capacitor bank and pulse-triggered switch are mounted on a reinforced bracket in the middle of the cabin. Its discharge electrodes extend into an open or semi-open chamber at the rear of the cabin, allowing the plasma bubble to expand freely and avoiding impact on other components inside the cabin.

[0074] 3. High-frequency source unit:

[0075] Type: Piezoelectric ceramic wafer array.

[0076] Integrated Design: The array is directly embedded as an acoustic panel on the belly or side of the hull, with its surface flush with the hull shell to reduce fluid noise. Behind the panel is a matching layer and backing material to optimize forward radiation of sound waves and suppress stray vibrations.

[0077] 4. In-cabin central integrated control system:

[0078] Location: Installed inside the cabin in the protected core area, connected to the shell via shock absorbers.

[0079] Enhanced functionality: In addition to the original control functions, a new drag attitude sensing module (including a gyroscope, accelerometer and depth sensor) has been added, which can fine-tune the excitation timing according to the real-time drag state (such as undulation, sway) to maintain stable beam directivity.

[0080] 5. Shared mothership interface and energy system:

[0081] Composition: Connected to the mother ship via a single high-strength armored towline. This towline contains high-power power conductors, high-speed fiber optic data cables, and tensile-resistant armor.

[0082] Function: Provides power from the mother ship to the entire system and is responsible for full-duplex data communication with the ship's main control computer. The compartment can be equipped with auxiliary energy storage modules (such as supercapacitor banks) to meet the high-power demands of the instantaneous discharge of the electrical spark unit.

[0083] The exploration vessel lowered the integrated towed hull into the water using a winch and A-frame on its deck.

[0084] The towed body is connected to the ship via a single armored tow cable, and the ship's generator supplies power through the cable. The operators communicate with the control system inside the cabin through optical fibers in the cable.

[0085] The operator issues the start command. The dragging attitude sensing module transmits depth and attitude data back in real time.

[0086] When the system is triggered, the central integrated control system precisely controls the three units according to the preset program and water depth and attitude data:

[0087] A vibrating plate that drives a low-frequency electromagnetic exciter.

[0088] Command the switching action of the intermediate frequency electrical spark unit.

[0089] Transmit coded electrical signals to a high-frequency piezoelectric array.

[0090] The sound waves generated by the three units radiate outward through their respective optimized acoustic channels (sound-permeable diaphragm, open chamber, acoustic panel), and merge into a broadband composite wave in the far-field water area.

[0091] The reflected signal is recorded by a synchronously towed receiving cable (such as a multi-channel seismic towed cable), completing one acquisition.

[0092] The integrated marine towed multi-source fusion broadband seismic source system includes:

[0093] A streamlined towing hull, the internal sections of which integrate:

[0094] A low-frequency vibration source unit, which is an electromagnetic exciter, with an effective frequency band covering 100Hz to 500Hz;

[0095] A mid-frequency source unit, which is an electric spark source, with an effective frequency band covering 500Hz to 3kHz;

[0096] A high-frequency source unit, which is a piezoelectric ceramic transducer array, with an effective frequency band covering 2kHz to 10kHz;

[0097] A central integrated control system is used to coordinate the control of the three seismic source units;

[0098] The towing hull is connected to the mother ship via a single multi-functional armored towing cable, forming an integrated seismic source system capable of towing operations.

[0099] The electromagnetic exciter of the low-frequency vibration source unit is fixedly installed at the front of the cabin, and its vibration energy is radiated into the water through a large-area sound-permeable membrane.

[0100] The system according to claim 1 is characterized in that the discharge electrode of the electric spark source of the intermediate frequency source unit is located in an open or semi-open cavity at the tail of the cabin.

[0101] The system according to claim 1 is characterized in that the piezoelectric ceramic array of the high-frequency vibration source unit is embedded in the surface of the cabin in the form of an acoustic panel.

[0102] The system according to claim 1 is characterized in that the central integrated control system integrates a towing attitude sensing module, which can adjust the excitation parameters of the vibration source according to real-time towing attitude data.

[0103] Based on this, the present invention provides a method for an integrated towed multi-source fusion broadband seismic source at sea, which features integration and convenience:

[0104] The three seismic sources were integrated into a single towed body, enabling "single-cable" operation, which greatly simplified the offshore operation process and improved exploration efficiency.

[0105] Excellent signal stability: The fixed internal geometry ensures that the sound waves generated by each seismic source can form a stable and predictable interference and synthesis pattern in the far field, which significantly improves the consistency and repeatability of seismic data.

[0106] Optimized fluid performance: The streamlined hull design reduces fluid resistance and eddy noise, ensuring stability and acoustic performance at high towing speeds.

[0107] System-level reliability: The built-in energy management, health monitoring, and attitude feedback systems make this integrated towed body an intelligent and reliable underwater acoustic detection platform.

[0108] Example 2

[0109] In this embodiment, a computer terminal device is provided, including:

[0110] One or more processors;

[0111] A memory, coupled to the processor, for storing one or more programs;

[0112] When the one or more programs are executed by the one or more processors, the one or more processors implement the steps of the above-described method for an integrated towed multi-source fusion broadband seismic source at sea.

[0113] In this embodiment, a computer-readable storage medium is also provided, on which a computer program is stored. When the computer program is executed by a processor, it implements the steps of the above-described method for a marine integrated towed multi-source fusion broadband seismic source.

[0114] In this embodiment, an electronic device is also provided, including a memory and a processor. The memory stores a computer program, and the processor is configured to run the computer program to perform the steps of the above-described integrated marine towed multi-source fusion broadband seismic source method.

[0115] In this embodiment, a computer program product is also provided, including a computer program that, when executed by a processor, implements the steps of the above-described method for a marine integrated towed multi-source fusion broadband seismic source.

[0116] The aforementioned program can run on a processor or be stored in memory (or a computer-readable medium). Computer-readable media include both permanent and non-permanent, removable and non-removable media, and information storage can be achieved by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0117] These computer programs may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes can be implemented by different modules for different steps.

[0118] This embodiment provides such a device or system. The system, referred to as a marine integrated towed multi-source fusion broadband seismic source system, includes:

[0119] The integrated towed hull module integrates a low-frequency electromagnetic excitation unit, a medium-frequency electric spark unit, and a high-frequency piezoelectric ceramic array unit.

[0120] The mother ship interface and towing module are connected to the integrated towing hull module and the mother ship via a single armored towing cable, which is used to provide power and establish data communication.

[0121] An attitude perception and synchronization control module is located inside the integrated towing hull module. It is used to acquire towing attitude data in real time and synchronously drive the low-frequency electromagnetic excitation unit, the medium-frequency electric spark unit and the high-frequency piezoelectric ceramic array unit based on the attitude data.

[0122] The acoustic radiation fusion module consists of multiple acoustic channels disposed on the surface of the integrated towed hull module, which are used to radiate different frequency bands of acoustic waves generated by each unit into the water, so as to fuse them in the far field to form a broadband composite seismic wave signal.

[0123] As one implementation method in this embodiment, the integrated towing hull module includes:

[0124] The low-frequency vibration source installation structure is located at the center of gravity of the front of the cabin and is used to fix the low-frequency electromagnetic excitation unit and couple the vibration plate of the unit with the large-area sound-permeable membrane at the bottom of the cabin.

[0125] The intermediate frequency source chamber structure is located at the rear of the cabin, forming an open or semi-open chamber for accommodating the discharge electrodes of the intermediate frequency electric spark unit.

[0126] The high-frequency vibration source panel structure, as part of the cabin surface, is used to embed and install the high-frequency piezoelectric ceramic array unit in the form of an acoustic panel.

[0127] As one implementation method in this embodiment, the low-frequency electromagnetic excitation unit includes:

[0128] The electromagnetic exciter body is fixedly installed on the low-frequency vibration source mounting structure;

[0129] The vibrating plate is connected to the electromagnetic exciter body and coupled to the large-area sound-permeable diaphragm, and is used to generate sound waves with a frequency band covering 100Hz to 500Hz under drive.

[0130] As one implementation method in this embodiment, the intermediate frequency electrical discharge unit includes:

[0131] A high-voltage energy storage capacitor bank and a pulse trigger switch are installed inside the integrated towing hull module;

[0132] The discharge electrode extends into the mid-frequency source chamber structure and is used to generate plasma bubbles when the pulse-triggered switch is activated, thereby exciting sound waves with a frequency band covering 500Hz to 3kHz.

[0133] As one embodiment of this invention, the high-frequency piezoelectric ceramic array unit includes:

[0134] An array of piezoelectric ceramic wafers constitutes the acoustic radiation surface of the high-frequency vibration source panel structure.

[0135] A matching layer and backing structure are disposed behind the piezoelectric ceramic wafer array to drive the array to generate sound waves with a frequency band covering 2kHz to 10kHz and radiate them through the acoustic panel.

[0136] As one implementation method in this embodiment, the attitude perception and synchronization control module includes:

[0137] The drag attitude sensing submodule integrates a gyroscope, accelerometer and depth sensor to collect real-time attitude data including depth, undulation and sway information.

[0138] The central control submodule is used to receive the real-time attitude data and adjust the timing of the excitation control signals sent to each source unit according to the data to achieve synchronous drive.

[0139] The system or apparatus is used to implement the functions of the methods in the above embodiments. Each module in the system or apparatus corresponds to each step in the method, as has been described in the method and will not be repeated here.

[0140] The above-described implementation method solves the problem of integrated towed multi-source fusion broadband seismic source at sea in related technologies, thereby ensuring that the problems existing in the prior art are resolved.

[0141] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method of offshore integrated towed multi-source fusion wideband seismic source, characterized in that, The method comprises the following steps: a streamlined towed cabin body integrated with a low-frequency electromagnetic exciter, a medium-frequency electric spark unit and a high-frequency piezoelectric ceramic array is connected to a mother ship through a single armored tow cable for towing operation; power is provided to the streamlined towed cabin body through the tow cable and data communication is established; towing posture data of the streamlined towed cabin body is acquired in real time; based on the towing posture data, a central integrated control system in the cabin synchronously drives the low-frequency electromagnetic exciter, the medium-frequency electric spark unit and the high-frequency piezoelectric ceramic array to generate acoustic waves of different frequency bands respectively; the acoustic waves of different frequency bands are radiated into water through corresponding acoustic channels on the streamlined towed cabin body, so that they are fused to form a wideband composite seismic wave signal in a far field.

2. The method of claim 1, wherein, The internal integration process of the streamlined towed cabin body comprises: the low-frequency electromagnetic exciter is fixedly installed at a center of gravity position of a front part of the cabin body, and a vibration plate thereof is coupled with a large-area sound-transmitting diaphragm at a bottom of the cabin body; a discharge electrode of the medium-frequency electric spark unit is arranged in an open or semi-open chamber at a tail part of the cabin body; the high-frequency piezoelectric ceramic array is embedded in a surface of the cabin body in the form of an acoustic panel.

3. The method of claim 1, wherein, The process of synchronously driving the low-frequency electromagnetic exciter comprises: a driving signal is sent by the central integrated control system to control the vibration plate of the electromagnetic exciter to act, so that the vibration plate generates acoustic waves with a frequency band covering 100 Hz to 500 Hz and radiates the acoustic waves through the sound-transmitting diaphragm.

4. The method of claim 1, wherein, The process of synchronously driving the medium-frequency electric spark unit comprises: a pulse switch is triggered by the central integrated control system, so that a high-voltage energy storage capacitor group instantaneously discharges through the discharge electrode to generate a plasma bubble, and then excite acoustic waves with a frequency band covering 500 Hz to 3 kHz.

5. The method of claim 2, wherein, The process of synchronously driving the high-frequency piezoelectric ceramic array comprises: encoded electric signals are sent by the central integrated control system to the high-frequency piezoelectric ceramic array to drive the array to vibrate, so that the array generates acoustic waves with a frequency band covering 2 kHz to 10 kHz and radiates the acoustic waves through the acoustic panel.

6. The method of claim 1, wherein, The process of synchronously driving each unit based on the towing posture data through the central integrated control system comprises: the central integrated control system receives real-time data from a towing posture sensing module integrated therein; according to depth, heave and sway information contained in the real-time data, a time sequence of excitation control signals sent to each seismic source unit is adjusted.

7. An offshore integrated towed multi-source fusion wideband seismic source system, characterized in that, The system for implementing the method of any one of claims 1-6 comprises: an integrated towed cabin body module internally integrated with a low-frequency electromagnetic excitation unit, a medium-frequency electric spark unit and a high-frequency piezoelectric ceramic array unit; a mother ship interface and towed module connecting the integrated towed cabin body module and the mother ship through a single armored tow cable for providing power and establishing data communication; a posture sensing and synchronous control module arranged inside the integrated towed cabin body module for acquiring towing posture data in real time and synchronously driving the low-frequency electromagnetic excitation unit, the medium-frequency electric spark unit and the high-frequency piezoelectric ceramic array unit to work based on the posture data. The sound wave radiation fusion module is composed of a plurality of acoustic channels arranged on the surface of the integrated towed cabin module, and is used for radiating different frequency band sound waves generated by each unit to water to form a wide band composite seismic wave signal in a far field.

8. A computer terminal device, characterized by The method comprises the steps of: one or more processors; a memory coupled to the processors, for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the steps of the method as claimed in any one of claims 1-6.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method as claimed in any one of claims 1-6.

10. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method as claimed in any one of claims 1-6.

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