Water area seismic exploration device

Abstract

The utility model discloses a water area seismic exploration device which comprises a data acquisition device and a data comprehensive processing workstation which are in communication connection, the workstation is installed on an exploration ship, and the data acquisition device comprises a buoyancy frame platform, a sounding positioning system, a data fusion converter, a seismic source and a hydrophone; the buoyancy frame platform is connected with the stern of the exploration ship through a towing cable; the sounding positioning system is installed in the center of a middle bearing platform of the buoyancy frame platform, the converter is installed on the middle bearing platform and beside the sounding positioning system, and the sounding positioning system is in communication connection with the converter. A seismic source is installed on one side of the buoyancy frame platform, a hydrophone is installed on the other side of the buoyancy frame platform, and when the data acquisition device is static on the water surface, the center of a connecting line of the geometric center of the seismic source and the geometric center of the hydrophone coincides with the geometric center of the sounding positioning system; the converter, the seismic source and the hydrophone are all in communication connection with the work station. The device is used for water area seismic exploration, is accurate in positioning and depth setting data, and can obtain accurate space coordinates and elevation information of underwater stratum exploration.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of water area seismic exploration, especially to a water area seismic exploration device. BACKGROUND

[0002] Water area seismic exploration is a geophysical exploration method using the difference of elasticity and density of underwater stratum medium, observing and analyzing the propagation law of seismic wave generated by artificial earthquake in underwater stratum, and deducing the property and form of underwater geological stratum. Water area seismic exploration is widely applied in oil and gas exploration, engineering geological exploration, regional geological survey and sea area sedimentary stratum research.

[0003] The conventional water surface single-channel seismic exploration mode currently adopts a towed cable to separately tow a seismic source and a hydrophone (used for receiving the seismic signal reflected by underwater geological stratum) at the two ends of the stern of a ship to collect stratum exploration data, and a GNSS receiver and a depth sounding probe are installed on the side of the ship body. The GNSS receiver and the depth sounding probe simultaneously collect a group of data into a computer, and the seismic instrument on the ship also receives a corresponding group of stratum exploration data, which is transmitted into the computer for storage through a communication network cable. The conventional data processing mode is to take the center point of the line connecting the geometric center of the water surface seismic source and the geometric center of the hydrophone as the horizontal position of stratum exploration, measure the distance between the center point and the GNSS receiver with a ruler, and then calculate the coordinates of the exploration point through distance offset, so that a large error is usually generated in the actual exploration position coordinates. Moreover, when the ship body is towing the seismic source and the hydrophone, the seismic source and the hydrophone are affected by the ship sailing, and deviations such as device roll, pitch, water depth and attitude angle change are generated. In addition, since the exploration point and the water depth point are not on the same horizontal plane, the depth from the exploration water surface to the bottom and the actual water depth generate errors. If the offset distance is still measured to roughly correct, and the coordinate result is used as the final coordinate value of exploration, the absolute coordinate value of exploration is inaccurate, and the accuracy of underwater stratum exploration is affected. UTILITY MODEL CONTENT

[0004] In view of the defects and deficiencies in the prior art, the utility model provides a water area seismic exploration device to solve the precision problem of the coordinates and depth of water surface seismic method exploration.

[0005] The above-mentioned purpose of the utility model is realized by the following technical scheme.

[0006] The water area seismic exploration device comprises a data acquisition device and a data comprehensive processing workstation connected in communication, the workstation is installed on an exploration ship, the data acquisition device comprises a buoyancy frame platform floating on the water surface, a depth positioning system, a data fusion converter, a seismic source and a high-sensitivity multi-channel hydrophone, and wherein,

[0007] The buoyancy frame platform is connected with the stern of the exploration ship through a towline to be towed by the exploration ship;

[0008] The depth positioning system is installed in the center of the middle platform of the buoyancy frame platform, the transducer is installed on the middle platform and beside the depth positioning system, and the depth positioning system is connected with the transducer through a cable;

[0009] The source is installed on the side of the buoyancy frame platform corresponding to the hull of the exploration ship, the hydrophone is installed on the other side corresponding to the hull, and when the data acquisition device is stationary on the water surface, the center of the line connecting the geometric centers of the source and the hydrophone coincides with the geometric center of the depth positioning system;

[0010] The transducer, the source and the hydrophone are respectively connected with the workstation through a cable.

[0011] Preferably, the depth positioning system comprises a GNSS-INS combined positioning unit and a depth unit, the GNSS-INS combined positioning unit comprises a GNSS receiver coaxially installed on the upper end of the connecting rod and an inertial navigation module coaxially installed on the lower end of the connecting rod, the lower end of the inertial navigation module is fixed to the upper center of the middle platform through a connecting plate, the GNSS receiver and the inertial navigation module are connected through a cable, and the GNSS-INS combined positioning unit is connected with the transducer through a cable;

[0012] The depth unit comprises a depth probe installed on the lower end of the sleeve rod, the upper end of the sleeve rod is welded and fixed to the lower center of the middle platform, and the signal line of the depth probe is led out from the wire hole on the sleeve rod and connected with the transducer.

[0013] Preferably, the buoyancy frame platform comprises a board-shaped middle platform and two mounting racks symmetrically arranged at the two ends of the middle platform, 2n mounting frames are formed on each mounting rack to mount 2n floating cylinders, where n is a non-zero natural number, and the axis of each mounted floating cylinder is parallel to the direction of the buoyancy frame platform being towed.

[0014] Preferably, the source is welded and mounted on the lower side of one of the mounting racks.

[0015] The lower side surfaces of the front and rear ends of the other mounting rack are respectively provided with a locking ring, and the two ends of the hydrophone are respectively locked and fixed through the two locking rings.

[0016] Preferably, the front side surfaces of the front ends of the two mounting racks are respectively provided with a connecting ring, and the two connecting rings correspond to the two ends of the stern of the exploration ship and are respectively connected through a towline.

[0017] Preferably, the buoyancy frame platform is provided with eight floating cylinders, that is, n=2.

[0018] Preferably, the intermediate platform and the mounting frame at both ends thereof are made of titanium alloy.

[0019] Compared with the prior art, the technical scheme of the utility model has the beneficial effects that:

[0020] By fixing and installing the seismic source, the hydrophone and the depth positioning system on the same carrier (i.e. the buoyancy frame platform), the relative positions among the three are stable and will not be affected by the ship sailing, so that a large error of the actual exploration position coordinates can be avoided.

[0021] The data acquisition device is provided with an inertial navigation system, and can collect three-dimensional posture, angle and other data of the device in the detection process; on the basis of the above data, a series of corrections such as navigation delay, bow deviation, roll and pitch can be made, so that the correction amount of the coordinates can be obtained, and the positioning is more accurate; when the data acquisition device is stationary on the water surface, the center of the line connecting the geometric center of the seismic source and the geometric center of the hydrophone coincides with the geometric center of the depth positioning system, so that the accurate coordinate value obtained by the geometric center of the "GNSS-inertial navigation combination + depth probe device" (depth positioning system) after data fusion processing can be taken as the actual coordinate of the underwater stratum exploration, and the accuracy of the exploration point is ensured.

[0022] The inertial navigation data, the positioning coordinate data and the water depth data are converted and fused through the converter; after the combined data is stored by the computer, the seismic wave exploration data processed in the industry and the combined data are fused, so that accurate exploration results can be obtained.

[0023] Other advantages, objects and features of the utility model will be embodied in part through the following description, and will be understood by those skilled in the art through research and practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is an installation and application schematic view of the water area seismic exploration device of the exemplary embodiment of the utility model;

[0025] Figure 2 It is a perspective view of the data acquisition device (the depth probe is omitted);

[0026] Figure 3 It is a front view of the data acquisition device (the depth probe is omitted);

[0027] Figure 4 It is a top view of the data acquisition device (the depth probe is omitted);

[0028] Figure 5 It is a left view of the data acquisition device (the depth probe is omitted);

[0029] Figure 6is a perspective view of a buoyant framed platform;

[0030] Figure 7 is a perspective view of a depth positioning system;

[0031] In the figure: buoyant framed platform 1, intermediate deck 11, mounting frame 12, buoy 13, seismic source 2, seismic source signal cable 21, transducer 3, transducer signal cable 31, depth positioning system 4, GNSS receiver 41, inertial navigation module 42, communication cable of GNSS-inertial combined positioning unit 43, signal line of depth probe 44, sleeve rod 45, depth probe 46, hydrophone 5, hydrophone signal cable 51, tow cable 6, locking ring 7, connecting ring 8. DETAILED DESCRIPTION

[0032] The accompanying drawings are only intended to illustrate, and cannot be understood as a limitation to the patent;

[0033] In order to better illustrate the embodiment, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0034] For those skilled in the art, it can be understood that some well-known structures in the drawings and their descriptions may be omitted;

[0035] In the description of the present application, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "arrangement", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be said that the two elements are connected internally. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The terms "up", "down", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present application.

[0036] The technical scheme of the present application will be further described below in combination with the drawings and examples.

[0037] As Figure 1As shown, it is the installation application schematic view of the water area seismic exploration device of the exemplary embodiment of the utility model, the water area seismic exploration device includes the data acquisition device and data comprehensive processing workstation of communication connection, the workstation is installed on the exploration ship, the data acquisition device floats on the water surface behind the stern of the exploration ship, it includes buoyancy frame platform 1 that floats on the water surface, depth positioning system 4, data fusion converter 3, seismic source 2 and high sensitivity multichannel hydrophone 5, wherein,

[0038] Buoyancy frame platform 1 is connected with the stern of the exploration ship through tow cable 6, to move forward on the water surface by the exploration ship dragging data acquisition device.

[0039] Depth positioning system 4 is installed in the middle of buoyancy frame platform 1 (i.e. the geometric center position of buoyancy frame platform), converter 3 can be fixed by welding or screw fixed installation in the middle of the platform 11 and located in the depth positioning system 4 side (such as left side), depth positioning system 4 is connected with converter 3 through cable communication.

[0040] The side corresponding to the hull of the buoyancy frame platform 1 (such as the left side of the hull) installs seismic source 2, and the other side corresponding to the hull (such as the right side of the hull) installs hydrophone 5, and when the data acquisition device is stationary floating on the water surface, the center line of the geometric center of the seismic source and the geometric center of the hydrophone coincides with the geometric center of the depth positioning system.

[0041] The above-mentioned converter 3, seismic source 2, hydrophone 5 are connected with the workstation through converter signal cable 31, seismic source signal cable 21, hydrophone signal cable 51 respectively, and the positioning, attitude angle, depth data and seismic reflection signal data of exploration can be displayed simultaneously in the workstation software interface.

[0042] For example, Figure 7As shown, in some preferred embodiments, the depth positioning system 4 comprises a GNSS-INS integrated positioning unit and a depth unit, the GNSS-INS integrated positioning unit comprises a GNSS receiver 41 (with coordinate positioning function) coaxially installed on the upper end of the connecting rod and an inertial navigation module 42 (real-time acquisition of three-axis attitude and acceleration data of the data acquisition device) coaxially installed on the lower end of the connecting rod, the lower end of the inertial navigation module 42 is provided with a connecting plate which can be fixed on the middle support 11 by screwing at the four corners respectively, and the central axis of the GNSS-INS integrated positioning unit is aligned with the upper center of the middle support 11 during installation. The GNSS receiver 41 and the inertial navigation module 42 are connected by a cable communication connection between the ports to take advantage of the complementary characteristics of the navigation functions of the two to achieve accurate positioning of the positioning system; at the same time, the communication cable 43 of the GNSS-INS integrated positioning unit is connected to the converter 3. The depth unit comprises a depth probe 46 (measuring water depth data at the corresponding exploration position, completing accurate collection of water depth) installed on the lower end of the sleeve rod 45, which is coaxially arranged with the aforementioned connecting rod, and the upper end is welded and fixed to the lower center of the middle support 11, and the signal line 44 of the depth probe is led out from the wire hole (not shown) on the sleeve rod 45 and connected to the converter 3.

[0043] It should be noted that the converter 3 has the function of converting and fusing inertial navigation data, positioning coordinate data and water depth data, and after the combined data is stored by the computer, the seismic wave exploration data processed by the computer is fused with the combined data to obtain accurate exploration results.

[0044] As shown in Figure 6 The buoyancy frame platform 1 can be configured as a whole H-shaped, comprising a board-shaped middle support 11 and two symmetrically constructed mounting frames 12 at both ends of the middle support, each mounting frame is formed with 2n mounting frames for mounting 2n floating buoys 13, where n is a non-zero natural number, for example, n is 2, that is, four mounting frames are formed on each mounting frame 12, and four floating buoys 13 are correspondingly mounted, and the four mounting frames (floating buoys) can be distributed in a rectangular shape on the mounting frame, and the axial direction of each floating buoy 13 is parallel to the direction of the buoyancy frame platform 1 being towed to reduce water flow resistance.

[0045] The eight floating buoys 13 of the buoyancy frame platform 1 described above can be plastic floating buoys, which are light, low in cost, easy to assemble and have a long service life; the middle support 11 and the mounting frames 12 at both ends thereof can be made of titanium alloy material, which has high strength, low density, excellent corrosion resistance, good heat resistance and low temperature performance.

[0046] As shown in Figures 2-5As shown, the seismic source 2 is welded and installed on the lower middle of the left mounting bracket 12 of the aforementioned buoyancy frame platform 1; locking rings 7 are respectively provided on the lower surface of the middle of the front and rear ends of the right mounting bracket 12, and the two ends of the hydrophone 5 are locked and fixed by the two locking rings 7 respectively. This installation is so that the center of the line connecting the geometric center of the seismic source and the geometric center of the hydrophone coincides with the geometric center of the depth sounding positioning system.

[0047] The two mounting brackets 12 mentioned above each have a connecting ring 8 on their front surface at the middle of their front ends. These two connecting rings 8 correspond to the two ends of the stern of the exploration vessel and are connected by tow cables 6. In other words, the entire data acquisition device is connected to the two ends of the stern via the tow cables 6 on both sides. It should be noted that the length of the tow cables 6 can be adjusted according to actual needs and the size of the vessel, thereby adjusting the distance between the data acquisition device and the vessel. Generally, a distance of 10 meters or more is preferred to effectively reduce the impact of stern vibration and noise.

[0048] use Figure 1 The device shown performs underwater seismic exploration: After setting information such as water depth, source frequency, and sampling data interval at the workstation, the workstation transmits commands, the source receives the commands, and seismic signals are transmitted to the underwater strata. The hydrophone receives the seismic signals reflected from the underwater strata and converts them into electrical signals, which are then transmitted to the workstation for processing. Simultaneously, the GNSS-INS integrated positioning unit collects positioning, attitude, and angle data and transmits them to the converter, while the bathymetry unit collects water depth data and transmits it to the converter. The converter converts and fuses the inertial navigation data, positioning coordinate data, and water depth data before transmitting them to the workstation. The workstation first fuses the bathymetry and positioning data to generate accurate positioning and depth data. Then, it processes the strata exploration data generated by the source and hydrophone to generate single-channel seismic waveforms for each exploration location, and then fits them to produce a two-dimensional seismic profile. The processed accurate coordinate and elevation data are then fused with the seismic profile to generate a final seismic profile with precise coordinates and elevation.

[0049] When this device is used for seismic exploration in water areas, its positioning and depth data are accurate, and it can obtain accurate spatial coordinates and elevation information of underwater strata, providing accurate basic exploration data for project construction.

[0050] For any other points not mentioned, please refer to existing technology.

[0051] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be covered within the protection scope of the present utility model.

Claims

1. A seismic exploration device for water areas, comprising a data acquisition device with communication connection and a data processing workstation, wherein the workstation is installed on an exploration vessel, characterized in that, The data acquisition device includes a buoyancy frame platform floating on the water surface, a depth sounding and positioning system, a data fusion converter, a seismic source, and a high-sensitivity multi-channel hydrophone; wherein, The buoyancy frame platform is connected to the stern of the exploration vessel via a tow cable, so that it can be towed forward by the exploration vessel. The depth sounding and positioning system is installed in the center of the intermediate support of the buoyancy frame platform. The converter is installed on the intermediate support and located next to the depth sounding and positioning system. The depth sounding and positioning system is connected to the converter via a cable. The seismic source is installed on one side of the buoyancy frame platform corresponding to the hull of the exploration vessel, and the hydrophone is installed on the other side corresponding to the hull. When the data acquisition device is stationary and floating on the water surface, the center of the line connecting the geometric center of the seismic source and the geometric center of the hydrophone coincides with the geometric center of the depth sounding and positioning system. The converter, the seismic source, and the hydrophone are respectively connected to the workstation via cables.

2. The water seismic exploration device according to claim 1, characterized in that, The depth sounding and positioning system includes a GNSS-inertial navigation combined positioning unit and a depth sounding unit. The GNSS-inertial navigation combined positioning unit includes a GNSS receiver coaxially mounted on the upper end of the connecting rod and an inertial navigation module on the lower end. The lower end of the inertial navigation module is fixed to the upper center of the intermediate support through a connecting plate. The GNSS receiver and the inertial navigation module port are connected via a cable for communication. The GNSS-inertial navigation combined positioning unit is connected to the converter via a cable for communication. The depth measuring unit includes a depth measuring probe installed at the lower end of the sleeve rod. The upper end of the sleeve rod is welded and fixed to the lower center of the intermediate support. The signal line of the depth measuring probe is led out from the wire hole on the sleeve rod and connected to the converter.

3. The water seismic exploration device according to claim 1 or 2, characterized in that, The buoyancy frame platform includes a slatted intermediate support and two symmetrical mounting frames at both ends of the intermediate support. Each mounting frame has 2n mounting frames for mounting 2n pontoons, where n is a non-zero natural number, and the axis of each mounted pontoon is parallel to the direction in which the buoyancy frame platform is dragged forward.

4. The water seismic exploration device according to claim 3, characterized in that, The seismic source is welded and installed in the middle of the lower side of one of the mounting brackets; The lower surface of the front and rear ends of the other mounting bracket is provided with locking rings, and the two ends of the hydrophone are locked and fixed by the two locking rings respectively.

5. The water seismic exploration device according to claim 3, characterized in that, The front surface of the two mounting brackets is provided with connecting rings at the middle of the front end. The two connecting rings correspond to the two ends of the stern of the exploration vessel and are connected by tow cables.

6. The water seismic exploration device according to claim 3, characterized in that, The buoyancy frame platform is equipped with a total of eight pontoons, i.e., n=2.

7. The water seismic exploration device according to claim 3, characterized in that, The intermediate support platform and the mounting brackets at both ends are made of titanium alloy.

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