A water depth detection method, device, equipment and medium

Abstract

The application discloses a water depth detection method, device, equipment and medium. The method comprises the following steps: acquiring a transmission position of an active source and a receiving position of a passive source; determining a middle point between the active source and the passive source according to the transmission position and the receiving position, and taking the middle point as a water depth point to be detected; acquiring an excitation time of multiple seismic waves excited by the active source and a first arrival time of each seismic wave received by the passive source; and calculating a seawater depth of the water depth point to be detected according to the transmission position, the receiving position, the excitation time of each seismic wave and the first arrival time. The embodiment of the application can improve the accuracy and efficiency of detecting the seawater depth.

Description

Technical Field

[0001] This invention relates to the field of marine seismic exploration technology, and in particular to a method, apparatus, equipment and medium for measuring water depth. Background Technology

[0002] With the rapid development of marine seismic exploration, the process involves sending seismic waves to the seabed, receiving and analyzing the reflected seismic waves to obtain information about the seabed's structure and tectonic features. In this process, it is necessary to measure the ocean depth, and the accuracy of the depth measurement directly affects the propagation path and reflection time of the seismic waves.

[0003] Currently, ocean depth can be measured using depth sounders.

[0004] However, the use of depth sounders has drawbacks such as low accuracy, high operational difficulty, and high cost. Summary of the Invention

[0005] This invention provides a method, apparatus, equipment, and medium for detecting water depth. The embodiments of this invention can improve the accuracy and efficiency of detecting seawater depth.

[0006] In a first aspect, embodiments of the present invention provide a water depth detection method, the method comprising:

[0007] Obtain the transmission position of the active source and the reception position of the passive source;

[0008] Based on the launch and reception locations, determine the midpoint between the active and passive sources and use it as the water depth to be measured.

[0009] Obtain the excitation time of multiple seismic waves excited by the active source and the first arrival time of each seismic wave received by the passive source;

[0010] The seawater depth at the point to be measured is calculated based on the launch location, receiver location, excitation time and first arrival time of each seismic wave.

[0011] Secondly, embodiments of the present invention also provide a water depth detection device, the device comprising:

[0012] The location acquisition module is used to acquire the transmission location of the active source and the reception location of the passive source.

[0013] The depth-to-be-measured point determination module is used to determine the midpoint between the active source and the passive source based on the transmission and reception positions, and use it as the depth-to-be-measured point.

[0014] The time acquisition module is used to acquire the excitation time of multiple seismic waves excited by the active source and the first arrival time of each seismic wave received by the passive source.

[0015] The depth calculation module is used to calculate the seawater depth at the point to be measured based on the transmission location, the receiving location, the excitation time and the first arrival time of each seismic wave.

[0016] Thirdly, embodiments of the present invention also provide a water depth detection device, the water depth detection device comprising:

[0017] At least one processor; and

[0018] A memory that is communicatively connected to at least one processor; wherein,

[0019] The memory stores a computer program that can be executed by at least one processor, such that the at least one processor is able to perform the water depth detection method according to any embodiment of the present invention.

[0020] Fourthly, embodiments of the present invention also provide a computer-readable storage medium storing computer instructions that, when executed by a processor, implement the water depth detection method of any embodiment of the present invention.

[0021] The technical solution of this invention, by acquiring the positions of the active and passive sources, can ensure spatial reference information during the measurement process and accurately locate the positions of the source and receiver during the calculation process, thus providing a basis for subsequent calculations; by determining the midpoint between the active and passive sources and using it as the water depth point to be measured, the location of the water depth point to be measured can be clearly defined; by acquiring the excitation time and first arrival time of multiple seismic waves, sufficient time data can be provided to calculate the propagation path and propagation time of seismic waves, enhancing the accuracy and reliability of the measurement results; by combining the transmission position, receiving position, excitation time, and first arrival time for calculation, the precision and accuracy of water depth measurement can be improved, thus making the measurement of seawater depth more reliable.

[0022] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A flowchart of a water depth detection method provided in an embodiment of the present invention;

[0025] Figure 2 A side view of a seismic source subarray provided in an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of coordinate observation of an active source and a passive source provided in an embodiment of the present invention;

[0027] Figure 4 This is a top view schematic diagram of a seismic source dragging according to an embodiment of the present invention;

[0028] Figure 5 A flowchart of a water depth detection method provided in an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of seawater depth calculation for a water depth point to be measured, provided as an embodiment of the present invention.

[0030] Figure 7 This is a schematic diagram illustrating the alternation of active and passive source functions as provided in an embodiment of the present invention.

[0031] Figure 8 A schematic diagram illustrating the initial arrival pickup of seabed reflected signals provided in an embodiment of the present invention;

[0032] Figure 9 A schematic diagram for water depth verification provided in an embodiment of the present invention;

[0033] Figure 10 A comparison curve between measurements taken with traditional depth gauges is provided for an embodiment of the present invention;

[0034] Figure 11 This is a schematic diagram of the structure of a water depth detection device provided in an embodiment of the present invention;

[0035] Figure 12 This is a schematic diagram of a water depth detection device provided in an embodiment of the present invention. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] The acquisition, storage, and application of earthquake data and other related information in the technical solutions of this invention comply with relevant laws and regulations and do not violate public order and good morals.

[0039] Figure 1 This is a flowchart illustrating a water depth detection method provided in an embodiment of the present invention. This embodiment is applicable to water depth detection, and the method can be executed by a water depth detection device, which can be implemented in hardware and / or software.

[0040] See Figure 1 The water depth measurement method shown includes:

[0041] S101. Obtain the transmission position of the active source and the reception position of the passive source.

[0042] In this context, an active source can refer to equipment or tools used in water depth measurement to generate seismic waves. An active source excites seismic waves by releasing energy; these waves propagate underwater and are reflected back to the passive source from the seabed. An active source can also refer to the excitation unit of a source subarray, as shown in the side view of which is illustrated below. Figure 2 As shown, the source subarray float is located on the same plane as the sea surface, and the plane where the source subarray excitation unit is located is the excitation plane.

[0043] The launch location refers to the specific spatial location where seismic waves are emitted when an active source excites them. The launch location can be determined by the geometric center of the source device or the location of a specific excitation unit; the specific location can be obtained using the positioning device of the source equipment. When the source consists of multiple subarrays, the launch location can be the geometric center point of each subarray. For example... Figure 2 As shown, the positioning device of the seismic source subarray can obtain the emission position of the active source.

[0044] In this context, a passive source can refer to equipment or tools used in water depth measurement to receive seismic waves. The function of a passive source is to receive seismic waves that have been reflected back from the seabed. Passive sources do not participate in the generation of seismic waves; they are only responsible for receiving them. For example... Figure 2 As shown, the receiving unit of the seismic source subarray is responsible for receiving the near-field wavelet reflected back from the seabed, and the plane in which the near-field wavelet is received is the receiving plane.

[0045] The receiving location refers to the spatial location where a passive source receives seismic waves. The receiving location can be determined by the position of the receiving equipment or the geometric center of the receiving point. The receiving location determines the endpoint of seismic wave propagation; it is the spatial location where the seismic wave, after propagation and reflection from the emission location, reaches the receiving location and is recorded by the receiving equipment.

[0046] S102. Based on the transmission and reception positions, determine the midpoint between the active and passive sources and use it as the water depth to be measured.

[0047] Specifically, a Cartesian coordinate system can be established based on the transmission and reception locations, with the midpoint between the active and passive sources as the origin. Since the specific spatial coordinates of the transmission and reception locations can be obtained, the specific spatial coordinates of the origin can be calculated from these coordinates. Seismic waves are generated by the active source, reflected to a reflection point on the seabed, and then return to the passive source. The reflection point on the seabed is the midpoint between the active and passive sources, i.e., the origin of the coordinate system, thus allowing the specific spatial coordinates of this reflection point to be obtained.

[0048] The water depth to be measured can refer to the specific location where the water depth needs to be measured. The water depth to be measured can be located at the midpoint between the active source and the passive source. This water depth to be measured is also the reflection point of the seismic wave generated by the active source to the seabed and then back to the seabed of the passive source.

[0049] In a specific example Figure 3 This invention provides a schematic diagram of coordinate observation of an active source and a passive source, wherein the coordinates of the geometric center of the active source at the excitation time (x...) i y i (x) represents the emission position of the active source, and (x) represents the near-field wavelet coordinates of the passive source at the excitation time. h y h The location of the passive source is shown in the diagram. The coordinates of the seabed reflection point at the excitation time are the coordinates of the origin of the coordinate system. The source ship is located on the Inline axis, and the geometric centers of the active and passive sources are located on the Crossline axis. Figure 4This is a top-view schematic diagram of a seismic source dragging system provided in an embodiment of the present invention. When the right source is the active source, the left source is the passive source; conversely, when the right source is the passive source, the left source is the active source. An extender is used to control the positions of the left and right sources, ensuring that the distance between the active and passive sources is less than twice the water depth. The geometric center of the active and passive sources can be set to 25 meters.

[0050] S103. Obtain the excitation time of multiple seismic waves excited by the active source and the first arrival time of each seismic wave received by the passive source.

[0051] The excitation time can refer to the moment when the active source emits seismic waves.

[0052] The first arrival time can refer to the moment when the seismic waves emitted by the active source reach the passive source receiving equipment after being reflected from the seabed.

[0053] Specifically, such as Figure 2 As shown, in a source subarray device, four seismic waves can be excited simultaneously. That is, the active source can excite multiple seismic waves and record the excitation time of each seismic wave. Similarly, the passive source also receives multiple seismic waves and records the first arrival time of each seismic wave.

[0054] S104. Calculate the seawater depth at the point to be measured based on the transmission location, receiving location, excitation time and first arrival time of each seismic wave.

[0055] As can be seen, in this embodiment, by obtaining the positions of the active and passive sources, spatial reference information can be ensured during the measurement process, and the positions of the source and receiver can be accurately located during the calculation process, thus providing a basis for subsequent calculations; by determining the midpoint between the active and passive sources and using it as the water depth point to be measured, the location of the water depth point to be measured can be clearly defined; by obtaining the excitation and first arrival times of multiple seismic waves, sufficient time data can be provided to calculate the propagation path and propagation time of the seismic waves, enhancing the accuracy and reliability of the measurement results; by combining the transmission position, receiving position, excitation time, and first arrival time for calculation, the precision and accuracy of water depth measurement can be improved, thus making the measurement of seawater depth more reliable.

[0056] In an optional embodiment, the process of "calculating the seawater depth of the target depth point based on the transmission location, reception location, excitation time and first arrival time of each seismic wave" is refined to "calculating the seismic wave propagation time based on the excitation time and first arrival time of each seismic wave; obtaining the propagation velocity of the current area; calculating the first depth between the source excitation plane and the target depth point based on the propagation velocity, seismic wave propagation time, transmission location, and reception location; calculating the second depth between the source excitation plane and the mean sea level; and calculating the sum of the first and second depths to obtain the seawater depth of the target depth point," thereby improving the operation of water depth detection.

[0057] It should be noted that for parts not described in detail in the embodiments of the present invention, please refer to the descriptions in other embodiments. Figure 5 This is a flowchart of a water depth detection method provided in an embodiment of the present invention.

[0058] See Figure 5 The water depth measurement method shown includes:

[0059] S501. Obtain the transmission position of the active source and the reception position of the passive source.

[0060] S502. Based on the transmission and reception positions, determine the midpoint between the active and passive sources and use it as the water depth to be measured.

[0061] S503. Obtain the excitation time of multiple seismic waves excited by the active source and the first arrival time of each seismic wave received by the passive source.

[0062] S504. Calculate the seismic wave propagation time based on the excitation time and first arrival time of each seismic wave.

[0063] The seismic wave propagation time refers to the time it takes for a seismic wave to travel from an active source to the seabed, be reflected, and reach a passive source. It can be calculated by the difference between the first arrival time and the excitation time. Propagation time is a key factor in water depth measurement; by calculating the propagation time, the distance of the seismic wave can be derived, and the water depth can be further calculated. In a specific example, if the difference between the excitation time and the first arrival time of a seismic wave is 5 milliseconds, then the seismic wave propagation time is 5 milliseconds.

[0064] S505, Obtain the propagation speed of the current area.

[0065] The current area can refer to the region where the water depth measurement point is located. Different areas have different sound wave velocity fields. The velocity field of the entire exploration area can be established using the measured sound velocity data, thereby obtaining the propagation speed of seismic waves in seawater at each location within the exploration area.

[0066] The propagation speed can refer to the speed at which seismic waves travel in the current area. For example, the propagation speed at point A is 1500 m / s, and the propagation speed at point B is 1530 m / s.

[0067] S506. Calculate the first depth between the source excitation plane and the water depth to be measured based on the propagation velocity, seismic wave transmission time, launch location, and receiver location.

[0068] The source-excitation plane can refer to the plane on which the seismic wave originates from the active source. For example... Figure 2As shown, the source excitation plane can be the excitation plane where the source subarray excitation unit is located.

[0069] The first depth can refer to the vertical distance between the excitation plane of the seismic source and the point where the water depth is to be measured. During the propagation of seismic waves, the seismic waves emitted by the active source first penetrate the water layer until they are reflected from the seabed and return to the passive source receiver. The vertical distance the seismic waves travel can be considered the first depth from the excitation plane of the seismic source to the point where the water depth is to be measured. Calculating the first depth helps determine the initial distance of seismic wave propagation, thereby estimating the water depth. In a specific example, if the seismic source is located 5 meters below the water surface, the first depth can be expressed as the vertical distance from the seismic source to the seabed. Assuming the distance between the seismic source and the seabed is 200 meters, then the first depth is 200 meters.

[0070] S507. Calculate the second depth between the source excitation plane and the mean sea level.

[0071] In marine exploration, water depth measurements are usually corrected relative to a fixed reference surface, which can be the globally recognized mean sea level. Therefore, the second depth is calculated based on the mean sea level.

[0072] The second depth can refer to the vertical distance between the seismic source's excitation plane and the mean sea level. The second depth needs to consider external factors, including the relative position of the seismic source vessel, tidal variations, the mean sea level, and the location of underwater equipment. The second depth is used to correct the distance between the seismic source's excitation plane and the actual sea level in order to ultimately calculate the actual water depth.

[0073] S508. Calculate the sum of the first depth and the second depth to obtain the seawater depth of the point to be measured.

[0074] Specifically, Figure 6 This invention provides a schematic diagram for calculating the seawater depth of a target water depth point; wherein, the first depth can refer to the vertical distance from the seismic source excitation plane to the reflection point; the second depth can refer to the vertical distance from the seismic source excitation plane to the mean sea level. The sum of the first depth and the second depth can be expressed by the following formula:

[0075]

[0076] In the formula, d a d represents the seawater depth at the point to be measured. w Indicates the second depth; v represents the propagation velocity of seismic waves in the current area; t represents the seismic wave propagation time; (x h y h (x) represents the x and y coordinates of the emission location of the active source; i yi () represents the x and y coordinates of the passive source's receiving position; since the measured water depth distance is much greater than the vertical distance between the active source's emission position and the passive source's receiving position, the active source's excitation position and the passive source's receiving position can be considered as the same plane.

[0077] As can be seen, in this embodiment, by calculating the propagation time of seismic waves, accurate time data can be provided for subsequent water depth calculations, thereby improving the accuracy of water depth measurement; by obtaining the propagation speed in the current area, the propagation characteristics of different areas can be taken into account, ensuring accurate water depth calculations under different sea areas or geological conditions; by considering the propagation speed, propagation time, and the emission and reception positions of seismic waves, the accurate depth between the source excitation plane and the water depth point to be measured can be calculated, providing important data for water depth measurement; by calculating the depth between the source excitation plane and the sea level, basic depth information related to the sea level can be obtained, which can be further used for accurate water depth estimation; by adding the first depth and the second depth, the seawater depth of the water depth point to be measured can be obtained comprehensively, thereby achieving more accurate water depth measurement.

[0078] In some embodiments, after calculating the seismic wave propagation time based on the excitation time and first arrival time of each seismic wave, the method further includes:

[0079] Obtain the equipment compensation duration;

[0080] The seismic wave transmission time is corrected based on the equipment compensation time.

[0081] The equipment compensation time refers to the difference in time between the received seismic wave and the actual transmission time due to the physical characteristics or operating state of the measuring equipment itself. The purpose of the equipment compensation time is to eliminate the impact of inherent equipment delays on measurement accuracy, ensuring that the measured seismic wave transmission time is closer to the actual transmission time. In a specific example, the passive source records the near-field signal in advance, setting the advance time as the advance error time. Because the seismic source uses a combination of multiple excitation units, these excitation units will have certain errors during excitation. That is, when the active source issues a command to excite the seismic wave, there is an error between the actual time the equipment emits the seismic wave and the time the excitation command is issued.

[0082] The correction refers to the adjustment of the equipment compensation time when calculating seismic wave propagation time. During the correction process, the first arrival time acquired during the calculation is adjusted to eliminate the impact of equipment delay on the final calculation result. The purpose of the correction is to ensure that the time parameters used in the calculation (such as excitation time and first arrival time) accurately reflect the actual propagation time of the seismic waves, thereby ensuring the accuracy of the water depth calculation. By correcting the first arrival time, errors in water depth measurement caused by factors such as internal equipment processing delays and differences in the response speed of the data acquisition system can be reduced.

[0083] As can be seen, in this embodiment, by obtaining the device compensation duration, the time delay of the device itself during the measurement process can be identified and quantified. This compensation duration helps to ensure that the device delay is taken into account when calculating the seismic wave transmission time, reducing errors and improving the accuracy of the water depth measurement results. By correcting the seismic wave transmission time according to the device compensation duration, the delay effect introduced by the device can be eliminated, making the calculated seismic wave transmission time more accurate. The final calculated water depth value will be more realistic and reliable, avoiding errors caused by device factors and improving the accuracy of water depth measurement.

[0084] In some embodiments, calculating a second depth between the source excitation plane and the mean sea level includes:

[0085] Obtain the first distance between the source excitation plane and the near-field wavelet receiving plane of the seismic source vessel; the seismic source vessel is equipped with an active source and a passive source;

[0086] Obtain the second distance between the near-field wavelet receiving plane and the actual sea level;

[0087] Get the tidal distance for the current round;

[0088] The second depth between the source excitation plane and the mean sea level is calculated based on the first distance, the second distance, and the tidal distance.

[0089] Here, the first distance can refer to the vertical distance between the excitation plane of the seismic source and the receiving plane of the near-field wavelet. In a specific example, if the excitation device is located 20 meters below the water surface and the receiver is installed 10 meters below the water surface, then the first distance is 10 meters. Here, the excitation device can refer to an active source and the receiver can refer to a passive source.

[0090] The true sea level can refer to the height of the actual sea level at which the seismic source ship is located due to tidal forces. Due to tidal forces, there is a certain height difference between the true sea level and the mean sea level.

[0091] The second distance can refer to the vertical distance between the near-field wavelet receiving plane and the sea level. The second distance measures the receiver's position relative to the sea level, and it corrects for the near-field receiver's height, resulting in a more accurate water depth reading. The second distance compensates for differences between the receiver's installation location and the sea level, ensuring that the calculated water depth value is consistent with the relative height of the sea level. In a specific example, if the near-field wavelet receiver is located 50 meters underwater, and the actual sea level is calibrated at 0 meters, then the second distance is 50 meters.

[0092] Because the seismic source vessel can use dual-source excitation, the functions of the active and passive sources can alternate. In a specific example, during the measurement of water depth at point A, the active source is used to excite seismic waves, and the passive source is used to receive them. When the seismic source vessel moves to measure water depth at point B, the functions of the active and passive sources alternate; the original active source becomes the passive source to receive seismic waves, and the original passive source becomes the active source to excite them. The alternation process is as follows: Figure 7 As shown, the selection of active and passive sources differs depending on the location of the seismic source vessel. For example, when the seismic source vessel moves from the left to the right side of the figure, the functions of the active and passive sources alternate, with the original active source becoming the passive source receiver and the original passive source receiver becoming the active source excitation.

[0093] Tidal distance refers to the vertical distance between the actual sea level and the mean sea level during tidal conditions. The tidal distance varies with the tidal cycle, directly affecting the correction of seawater depth. In a specific example, changes in tidal height lead to changes in sea level. For instance, during high tide, the sea level is higher than the mean sea level; while during low tide, the sea level is lower. The tidal distance is the actual vertical position of the sea level relative to the mean sea level at a specific moment; if the current tidal condition is high tide and the actual sea level is 1.5 meters above the mean sea level, the tidal distance is +1.5 meters; if the current tidal condition is low tide and the actual sea level is 1.5 meters below the mean sea level, the tidal distance is -1.5 meters. Figure 6 As shown, the tidal distance is tidal dt.

[0094] Specifically, based on the first distance, the second distance, and the tidal distance, the second depth between the earthquake source excitation plane and the mean sea level can be expressed by the above formula:

[0095] d w =d i +d j -d t

[0096] In the formula, d w Indicates the second depth; d i Indicates the first distance; dj Indicates the second distance; d t Indicates tidal distance.

[0097] As can be seen, in this embodiment, by obtaining the first distance between the source excitation plane and the near-field wavelet receiving plane of the source vessel, the spatial relationship between the source excitation plane and the receiving plane can be determined more accurately, thereby improving the accuracy of water depth calculation; by obtaining the second distance between the near-field wavelet receiving plane and the true sea level, the relative position between the receiving plane and the true sea level can be considered more accurately, reducing measurement deviations caused by distance errors; by obtaining the tidal distance of the current cycle, the influence of tides can be considered in the calculation, reducing the interference of tidal changes on the water depth measurement results and ensuring the accuracy of the calculation results; by combining the first distance, the second distance, and the tidal distance for calculation, the relative position between the source excitation plane, the receiving plane, and the true sea level, as well as the tidal effect, can be comprehensively considered, thereby more accurately calculating the second depth between the source excitation plane and the mean sea level, improving the accuracy and reliability of the measurement results.

[0098] In some embodiments, obtaining the excitation time of multiple seismic waves excited by an active source and the first arrival time of each seismic wave received by a passive source includes:

[0099] The excitation time of the multiple source subarray excitation units included in the active source is obtained, and the source subarray excitation unit emits a seismic wave;

[0100] The receiving time of multiple source subarray excitation units included in the passive source is obtained, and each source subarray excitation unit receives a seismic wave; wherein, the positions of the source subarray excitation units that emit the same seismic wave correspond to those of the source subarray excitation units that receive the same seismic wave.

[0101] The active source comprises multiple source subarrays, each capable of generating one seismic wave. Therefore, the excitation time of each source subarray is determined. Similarly, the passive source receives the seismic waves emitted by the active source. Thus, the positions of the source subarrays emitting the same seismic wave correspond to those of the source subarrays receiving the same seismic wave.

[0102] As can be seen, in this embodiment, by obtaining the excitation time of the seismic waves emitted by the source subarray excitation unit, the accurate pairing of the excitation and reception times of each seismic wave can be ensured, thereby improving the accuracy of the seismic wave propagation path and the spatiotemporal consistency of the data; by obtaining the reception time of the multiple source subarray excitation units included in the passive source, the moment when each source subarray receives the seismic wave can be accurately tracked, thereby ensuring the temporal sequence of the reception time data and optimizing the data acquisition process; by ensuring that the positions of the source subarray excitation unit that emits the same seismic wave correspond to those of the source subarray excitation unit that receives the same seismic wave, the spatial consistency during the reception and excitation process can be improved, the error caused by spatial misalignment can be reduced, and the positioning accuracy can be improved.

[0103] In some embodiments, obtaining the transmission location of the active source and the reception location of the passive source includes:

[0104] Based on the positions of the multiple source subarray excitation units included in the active source, the center position between the multiple source subarray excitation units included in the active source is determined and used as the emission position of the active source; the center point of the line segment connecting the center point of the active source and the center point of the passive source is used as the origin of the coordinate system.

[0105] Based on the positions of the multiple source subarray excitation units included in the passive source, the center position among the multiple source subarray excitation units included in the passive source is determined and used as the receiving position of the passive source.

[0106] The active source consists of multiple source subarray excitation units, each with its own spatial location. By calculating the geometric center location of these source subarray excitation units, i.e., the average point of their locations, a center location is determined as the emission location of the active source.

[0107] The passive source also consists of multiple source subarray excitation units, and the specific location of the passive source can be measured and recorded. By calculating the geometric center of these source subarray excitation units, a central location is determined as the receiving location of the passive source. The receiving location of the passive source is determined by the center point of each of its individual receiving units.

[0108] The line connecting the center points of the active and passive sources defines a baseline in space. The midpoint of this line segment is chosen as the origin of the coordinate system.

[0109] As can be seen, in this embodiment, by calculating the center positions of the excitation units of multiple source subarrays, the active source emission position can be determined, which helps to reduce the influence of the position error of a single excitation unit, thereby improving the accuracy and consistency of the emission position; by selecting the center point of the line connecting the center points of the active and passive sources as the coordinate origin, a unified coordinate system can be achieved; by calculating the center position of the passive source excitation unit, the passive source receiving position can be determined, which simplifies the definition of the receiving position, makes measurement and data processing more efficient, and reduces the impact of the deviation of the position of a single excitation unit on the overall result.

[0110] In some embodiments, calculating the seawater depth of the target depth point based on the transmission location, the receiving location, the excitation time and the first arrival time of each seismic wave further includes:

[0111] Obtain the seismic wave reception time detected by a calibration device at a fixed location; the seismic wave reception time is the time between the start of seismic wave excitation and its arrival at the seabed.

[0112] Calculate half of the seismic wave propagation time to obtain the propagation time to be verified;

[0113] The seismic wave reception time is compared with the transmission time to be verified to obtain the transmission time comparison result.

[0114] Based on the transmission time comparison results, determine whether the seawater depth of the depth point to be measured is accurate.

[0115] Optionally, the distance between the calibration equipment and the seismic source vessel should be less than or equal to a preset distance threshold. Since the calibration equipment is in a fixed position, while the movement of the seismic source vessel will change the water depth to be measured, ensuring that the distance between the water depth to be measured and each calibration equipment in a fixed position is less than or equal to the preset distance threshold is essential to ensure the accuracy of the calibration.

[0116] The seismic wave reception time refers to the time interval during which the calibration equipment detects the arrival of a seismic wave signal at a fixed location. After the seismic source emits seismic waves, the waves propagate through the medium and eventually reach the calibration equipment, which records the time of receipt.

[0117] The transmission time to be verified can refer to the seismic wave transmission time used to verify the measurement of water depth. By taking half the seismic wave transmission time, the time taken for the seismic wave to travel half the distance during the water depth measurement process can be obtained.

[0118] The transmission time comparison result refers to the comparison between the actual reception time of the seismic wave and the calculated transmission time to be verified. By comparing the actual reception time with the calculated transmission time, the difference between the two is analyzed. If the reception time is very close to the theoretical transmission time, it indicates that the seismic wave propagation process is normal, and the calculated water depth is relatively accurate. If the difference is large, there may be measurement errors or other influencing factors. For example, suppose the calculated transmission time to be verified is 0.3333 seconds, while the actual received seismic wave reception time is 0.35 seconds. The difference is 0.0167 seconds, representing a measurement error. Based on the magnitude of the transmission time comparison result, the accuracy of the seawater depth at the measured depth point is determined.

[0119] As can be seen, in this embodiment, by acquiring the seismic wave reception time recorded by the calibration device, the accuracy of the received signal during the measurement process can be ensured, the propagation time of the seismic wave can be determined, and the accuracy of subsequent depth calculation can be improved. By calculating half of the seismic wave transmission time and obtaining the transmission time to be calibrated, it is helpful to determine whether the propagation of the seismic wave meets expectations, thereby improving the reliability of water depth measurement. By comparing the seismic wave reception time with the transmission time to be calibrated, it can be confirmed whether the seismic wave arrives within the expected time. If there is a significant deviation between the reception time and the calibration time, it can be determined that there may be an error in the measurement process, and adjustments can be made accordingly. By judging the accuracy of water depth measurement based on the transmission time comparison results, it can be ensured that the calculation results conform to the actual situation. If there is a large difference, the measurement method or equipment settings can be readjusted to avoid incorrect depth calculations and improve measurement accuracy.

[0120] In a specific example Figure 8 This is a schematic diagram of the initial arrival pickup of seabed reflected signals provided in an embodiment of the present invention; the near-field wavelet detector uses a sampling frequency of 0.5 ms, thus collecting more accurate seabed reflected signals. Figure 8 In the diagram, channels 1-8 represent signals acquired by the near-field geophones installed at the active source, primarily used to detect the airgun firing status; channels 9-16 represent seismic signals received by the passive source near-field geophones, including direct wave signals excited by the active source and seabed reflection energy signals. Since each near-field geophone is installed at a different location within the subarray, the initial arrival positions of the seabed reflection signals they pick up may differ slightly. The initial arrival time t of the seabed reflection signal received by the passive source near-field wavelet is also shown. i It can be the first arrival time of each seismic wave received by the passive source.

[0121] In a specific example Figure 9This diagram illustrates a water depth verification method provided by an embodiment of the present invention. The water depth calculated using this embodiment is verified by selecting node data. The shot point data, after correction of the node data, is aligned and displayed to check the consistency of the first arrival times. If the overall first arrival times are smooth and without anomalies, it proves that the water depth data calculated using this embodiment is highly accurate. Figure 9 The discontinuous black dots in the data may refer to the first arrival times of the corrected shot points. The overall display shows that the first arrival times are smooth and without abnormalities, proving that the water depth data calculated through the embodiments of the present invention is highly accurate.

[0122] In a specific example, a water depth measurement method provided by an embodiment of the present invention is compared with a traditional water depth gauge measurement method to verify the differences and prove the feasibility of the embodiment of the present invention.

[0123] The specific steps are as follows:

[0124] 1) Data collection: Collect actual production data such as the coordinates of the active and passive sources, near-field wavelet signals, source configuration, tides, and sound speed of these 100 shot points.

[0125] 2) Near-field wavelet selection: Select the near-field wavelet closest to the excitation location of the active source from the passive source near-field wavelets as the object of further analysis.

[0126] 3) First arrival time determination: Determine the first arrival time of the near-field wavelet seabed reflection signal.

[0127] 4) Water depth calculation: Calculate the water depth corresponding to the initial arrival time using the water depth formula in the embodiment of the present invention.

[0128] Comparative analysis: The water depth calculated using the embodiments of the present invention is compared with the water depth obtained by the traditional depth gauge measurement method. Figure 10 This is a comparison curve provided by an embodiment of the present invention with that of a traditional depth gauge, wherein the curve for calculating water depth is the water depth measurement data provided by the embodiment of the present invention, and the curve for measuring water depth by the depth gauge is the water depth measurement data obtained by a traditional depth gauge.

[0129] Practical application verified that the method proposed in this invention has high accuracy in seabed depth measurement. In practical application, the calculated depth generally matched the actual measured depth, although slight differences existed at some shot points, possibly due to shot point location or system errors. Further optimization of the calculation method can improve measurement accuracy. This comparative verification only selected one near-field detector on the passive source for calculation. Using all near-field detectors in the calculation would further improve accuracy and increase measurement density. This demonstrates the potential advantages of this invention in seabed depth measurement and provides strong support for future research and applications.

[0130] Figure 11 This invention provides a schematic diagram of a water depth detection device. This invention is applicable to water depth detection applications, and the device can perform water depth detection methods. The device can be implemented in hardware and / or software.

[0131] See Figure 11 The water depth detection device shown includes: a location acquisition module 1101, a water depth point determination module 1102, a time acquisition module 1103, and a depth calculation module 1104, wherein...

[0132] The location acquisition module is used to acquire the transmission location of the active source and the reception location of the passive source.

[0133] The depth-to-be-measured point determination module is used to determine the midpoint between the active source and the passive source based on the transmission and reception positions, and use it as the depth-to-be-measured point.

[0134] The time acquisition module is used to acquire the excitation time of multiple seismic waves excited by the active source and the first arrival time of each seismic wave received by the passive source.

[0135] The depth calculation module is used to calculate the seawater depth of the target water depth point based on the transmission location, receiving location, excitation time and first arrival time of each seismic wave.

[0136] The technical solution of this invention, by acquiring the positions of the active and passive sources, can ensure spatial reference information during the measurement process and accurately locate the positions of the source and receiver during the calculation process, thus providing a basis for subsequent calculations; by determining the midpoint between the active and passive sources and using it as the water depth point to be measured, the location of the water depth point to be measured can be clearly defined; by acquiring the excitation time and first arrival time of multiple seismic waves, sufficient time data can be provided to calculate the propagation path and propagation time of seismic waves, enhancing the accuracy and reliability of the measurement results; by combining the transmission position, receiving position, excitation time, and first arrival time for calculation, the precision and accuracy of water depth measurement can be improved, thus making the measurement of seawater depth more reliable.

[0137] In some embodiments, in calculating the seawater depth of the target depth point based on the transmission location, the reception location, the excitation time and first arrival time of each seismic wave, the depth calculation module 1104 is specifically used for:

[0138] Calculate the seismic wave propagation time based on the excitation time and first arrival time of each seismic wave;

[0139] Get the propagation speed in the current area;

[0140] Calculate the first depth between the source excitation plane and the water depth to be measured based on the propagation speed, seismic wave propagation time, launch location, and receiver location;

[0141] Calculate the second depth between the earthquake source excitation plane and the mean sea level;

[0142] The seawater depth at the point to be measured is obtained by summing the first and second depths.

[0143] In some embodiments, after calculating the seismic wave propagation time based on the excitation time and first arrival time of each seismic wave, the depth calculation module 1104 is specifically used for:

[0144] Obtain the equipment compensation duration;

[0145] The seismic wave transmission time is corrected based on the equipment compensation time.

[0146] In some embodiments, in calculating a second depth between the source excitation plane and the mean sea level, the depth calculation module 1104 is specifically used for:

[0147] Obtain the first distance between the source excitation plane and the near-field wavelet receiving plane of the seismic source vessel; the seismic source vessel is equipped with an active source and a passive source;

[0148] Obtain the second distance between the near-field wavelet receiving plane and the actual sea level;

[0149] Get the tidal distance for the current round;

[0150] The second depth between the source excitation plane and the mean sea level is calculated based on the first distance, the second distance, and the tidal distance.

[0151] In some embodiments, the time acquisition module 1103 is specifically used for: acquiring the excitation time of multiple seismic waves excited by an active source and the first arrival time of each seismic wave received by a passive source;

[0152] The excitation time of the multiple source subarray excitation units included in the active source is obtained, and the source subarray excitation unit emits a seismic wave;

[0153] The receiving time of multiple source subarray excitation units included in the passive source is obtained, and each source subarray excitation unit receives a seismic wave; wherein, the positions of the source subarray excitation units that emit the same seismic wave correspond to those of the source subarray excitation units that receive the same seismic wave.

[0154] In some embodiments, the time acquisition module 1103 is specifically used for: acquiring the transmission position of the active source and the reception position of the passive source.

[0155] Based on the positions of the multiple source subarray excitation units included in the active source, the center position between the multiple source subarray excitation units included in the active source is determined and used as the emission position of the active source; the center point of the line segment connecting the center point of the active source and the center point of the passive source is used as the origin of the coordinate system.

[0156] Based on the positions of the multiple source subarray excitation units included in the passive source, the center position among the multiple source subarray excitation units included in the passive source is determined and used as the receiving position of the passive source.

[0157] In some embodiments, in calculating the seawater depth of the target depth point based on the transmission location, the reception location, the excitation time and first arrival time of each seismic wave, the depth calculation module 1104 is further specifically used for:

[0158] Obtain the seismic wave reception time detected by a calibration device at a fixed location; the seismic wave reception time is the time between the start of seismic wave excitation and its arrival at the seabed.

[0159] Calculate half of the seismic wave propagation time to obtain the propagation time to be verified;

[0160] The seismic wave reception time is compared with the transmission time to be verified to obtain the transmission time comparison result.

[0161] Based on the transmission time comparison results, determine whether the seawater depth of the depth point to be measured is accurate.

[0162] The water depth detection device provided in the embodiments of the present invention can execute the water depth detection method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the water depth detection method.

[0163] Figure 12 This is a schematic diagram of a water depth detection device provided in an embodiment of the present invention.

[0164] like Figure 12As shown, the depth detection device 1200 includes at least one processor 1201 and a memory, such as a read-only memory (ROM) 1202 or a random access memory (RAM) 1203, communicatively connected to the at least one processor 1201. The memory stores computer programs executable by the at least one processor. The processor 1201 can perform various appropriate actions and processes based on the computer program stored in the ROM 1202 or loaded into the RAM 1203 from the storage unit 1208. The RAM 1203 can also store various programs and data required for the operation of the depth detection device 1200. The processor 1201, ROM 1202, and RAM 1203 are interconnected via a bus 1204. An input / output (I / O) interface 1208 is also connected to the bus 1204.

[0165] Multiple components in the depth sensing device 1200 are connected to the I / O interface 1205, including: an input unit 1206, such as a keyboard, mouse, etc.; an output unit 1207, such as various types of displays, speakers, etc.; a storage unit 1208, such as a disk, optical disk, etc.; and a communication unit 1209, such as a network card, modem, wireless transceiver, etc. The communication unit 1209 allows the depth sensing device 1200 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0166] Processor 1201 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 1201 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any suitable processor, controller, microcontroller, etc. Processor 1201 performs the various methods and processes described above, such as water depth detection methods.

[0167] In some embodiments, the depth detection method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 1208. In some embodiments, part or all of the computer program may be loaded and / or installed on the depth detection device 1200 via ROM 1202 and / or communication unit 1209. When the computer program is loaded into RAM 1203 and executed by processor 1201, one or more steps of the depth detection method described above may be performed. Alternatively, in other embodiments, processor 1201 may be configured to perform the depth detection method by any other suitable means (e.g., by means of firmware).

[0168] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transferring data and instructions to the storage system, the at least one input device, and the at least one output device.

[0169] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0170] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0171] To provide interaction with the user, the systems and techniques described herein can be implemented on an operational depth sensing device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the depth sensing device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0172] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0173] A computing system can include clients and servers. Clients and servers are generally geographically separated and typically interact via communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system. It addresses the shortcomings of traditional physical hosts and VPS (Virtual Private Server) services, such as high management difficulty and weak business scalability.

[0174] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0175] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for detecting water depth, characterized in that, The method includes: Obtain the transmission position of the active source and the reception position of the passive source; Based on the transmission position and the receiving position, determine the midpoint between the active source and the passive source, and use it as the water depth to be measured. The excitation time of the multiple seismic waves excited by the active source and the first arrival time of each of the seismic waves received by the passive source are obtained. The seawater depth of the target depth point is calculated based on the launch location, the receiving location, the excitation time and first arrival time of each seismic wave.

2. The method according to claim 1, characterized in that, The step of calculating the seawater depth of the target depth point based on the transmission location, the receiving location, the excitation time and first arrival time of each seismic wave includes: Calculate the seismic wave propagation time based on the excitation time and first arrival time of each seismic wave. Get the propagation speed in the current area; The first depth between the source excitation plane and the water depth to be measured is calculated based on the propagation speed, the seismic wave transmission time, the emission location, and the receiving location. Calculate the second depth between the excitation plane of the seismic source and the mean sea level; The seawater depth of the point to be measured is obtained by calculating the sum of the first depth and the second depth.

3. The method according to claim 2, characterized in that, After calculating the propagation time of the seismic waves based on their excitation and first arrival times, the method further includes: Obtain the equipment compensation duration; The seismic wave transmission time is corrected based on the device compensation duration.

4. The method according to claim 2, characterized in that, The calculation of the second depth between the earthquake source excitation plane and the mean sea level includes: Obtain the first distance between the source excitation plane and the near-field wavelet receiving plane of the seismic source vessel; the seismic source vessel is equipped with an active source and a passive source; Obtain the second distance between the near-field wavelet receiving plane and the actual sea level; Get the tidal distance for the current round; The second depth between the source excitation plane and the mean sea level is calculated based on the first distance, the second distance, and the tidal distance.

5. The method according to claim 1, characterized in that, The acquisition of the excitation time of the multiple seismic waves excited by the active source and the first arrival time of each of the seismic waves received by the passive source includes: The excitation time of the multiple source subarray excitation units included in the active source is obtained, and the source subarray excitation unit emits a seismic wave; The receiving time of the multiple source subarray excitation units included in the passive source is obtained, and the source subarray excitation unit receives a seismic wave; wherein, the positions of the source subarray excitation unit that emits the same seismic wave correspond to the positions of the source subarray excitation unit that receives the same seismic wave.

6. The method according to claim 5, characterized in that, The acquisition of the transmission position of the active source and the reception position of the passive source includes: Based on the positions of the multiple source subarray excitation units included in the active source, the center position among the multiple source subarray excitation units included in the active source is determined and used as the emission position of the active source; the center point of the line segment connecting the center point of the active source and the center point of the passive source is used as the origin of the coordinate system. Based on the positions of the multiple source subarray excitation units included in the passive source, the center position among the multiple source subarray excitation units included in the passive source is determined and used as the receiving position of the passive source.

7. The method according to claim 2, characterized in that, Calculating the seawater depth at the target depth point based on the transmission location, the receiving location, the excitation time and first arrival time of each seismic wave further includes: The seismic wave reception time detected by a calibration device at a fixed location is obtained; the seismic wave reception time is the time between the start of seismic wave excitation and its arrival at the seabed. Calculate half of the seismic wave propagation time to obtain the propagation time to be verified; The seismic wave reception time is compared with the transmission time to be verified to obtain the transmission time comparison result. Based on the transmission time comparison results, determine whether the seawater depth of the depth point to be measured is accurate.

8. A water depth detection device, characterized in that, include: The location acquisition module is used to acquire the transmission location of the active source and the reception location of the passive source. The water depth determination module is used to determine the midpoint between the active source and the passive source based on the transmitting position and the receiving position, and use it as the water depth to be measured. The time acquisition module is used to acquire the excitation time of the multiple seismic waves excited by the active source and the first arrival time of each of the seismic waves received by the passive source. The depth calculation module is used to calculate the seawater depth of the target depth point based on the transmission location, the receiving location, the excitation time and first arrival time of each seismic wave.

9. A water depth detection device, characterized in that, The water depth detection equipment includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the water depth detection method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the water depth detection method according to any one of claims 1-7.

Images