19 results about "Ocean bottom" patented technology

A free surface multi-wave suppression method for ocean bottom node data, relating to the technical field of seismic exploration. The method comprises: performing interpolation of upgoing wave and downgoing wave ocean bottom node data (S110); separating multiple waves according to periodic characteristics of a wave field incident angle change (S120); and using a sparse inversion method to establish a target function, and, on the basis of the target function and by means of a fast iterative shrinkage threshold, solving for an upgoing wave field that does not contain multiple waves related to a free surface (S130), so as to remove multiple waves on the free surface. According to the method, multiple waves on a free surface in an upgoing wave field of ocean bottom node data of an ultra-shallow water area can be removed, and primary wave imaging quality of seismic data is improved. Further provided is a free surface multi-wave suppression apparatus for ocean bottom node data, a computer device, and a computer program product.

A method for designing a seismic survey including (a) selecting a seismic survey grid as a basis for a seismic survey design, (b) generating off-the-grid locations by imposing spatial / temporal constraints on on-the-grid locations of the seismic survey grid, (c) mapping the off-the-grid locations from a physical domain to a pre-selected domain by applying a multidimensional transform to the off-the-grid locations, (d) mapping the pre-selected domain to a rank-revealing domain using a pre-selected operator, (e) applying a pre-selected process to minimize a rank of the off-the-grid locations in the pre-selected domain, (f) updating the seismic survey design based on which of the off-the-grid locations has the minimum rank, (g) repeating steps (b)-(f) for a number of iterations until a pre-selected threshold is met indicating an optimal seismic survey design, and (h) acquiring seismic data using the optimal seismic survey design.

The invention discloses a submarine sediment in-situ low-frequency acoustic measurement system and method. The in-situ low-frequency acoustic measurement system for the seabed sediment comprises a mother ship, a control center, an umbilical cable, a low-frequency sound source transmitting host, a drill rod and a self-contained acoustic receiver, when the low-frequency sound source emission host controls the drill rod to drill into a target detection stratum, the self-contained acoustic receiver is put into the drill rod, after the drill rod clamps the self-contained acoustic receiver, the self-contained acoustic receiver is pressed into the target detection stratum, and the drill rod is used for drilling seabed sediments; the low-frequency sound source transmitting host is used for transmitting sound wave signals with different frequencies, and the self-contained acoustic receiver processes and converts the received sound wave signals with different frequencies into data and stores the data; the control center reads data measured by the self-contained acoustic receiver and analyzes the data to obtain sound velocity and sound attenuation of the seabed sediment at different frequencies. According to the invention, the accuracy of ocean sediment acoustic measurement can be improved, and the frequency range of ocean sediment acoustic measurement is increased.

A seabed magnetic exploration device capable of suppressing the difference in distance from each magnetic sensor to the seabed. [Solution] This is an underwater magnetic exploration device that explores dangerous objects on the seabed F by measuring with multiple magnetic sensors 12-21 fixed at intervals in a width direction W perpendicular to the direction of movement T of a frame body 11 that moves underwater. The device is equipped with multiple transmitters and receivers fixed to different locations in the width direction of the frame body 11, each of which emits sound waves toward the seabed F and receives reflected waves, distance derivation means that derives the distance from each transmitter and receiver to the seabed F based on the time difference between the emission of the sound wave by each transmitter and receiver and the reception of the reflected wave, and tilt adjustment means 25, 26, 27, 28 that adjust the tilt of the frame body 11 in the width direction.

A method for designing a seismic survey including (a) selecting a seismic survey grid as a basis for a seismic survey design, (b) generating off-the-grid locations by imposing spatial / temporal constraints on on-the-grid locations of the seismic survey grid, (c) mapping the off-the-grid locations from a physical domain to a pre-selected domain by applying a multidimensional transform to the off-the-grid locations, (d) mapping the pre-selected domain to a rank-revealing domain using a pre-selected operator, (e) applying a pre-selected process to minimize a rank of the off-the-grid locations in the pre-selected domain, (f) updating the seismic survey design based on which of the off-the-grid locations has the minimum rank, (g) repeating steps (b)-(f) for a number of iterations until a pre-selected threshold is met indicating an optimal seismic survey design, and (h) acquiring seismic data using the optimal seismic survey design.

The disclosure relates to an autonomous underwater vehicle for marine seismic data acquisition, the autonomous underwater vehicle comprising a cavity for accommodating an ocean bottom node such that a coupling surface of the ocean bottom node is at least partially exposed for coupling the ocean bottom node to a sea floor. The disclosure further relates to a marine seismic data acquisition system comprising an autonomous underwater vehicle and an ocean bottom node provided in the cavity. The disclosure further relates to a marine seismic data acquisition method comprising installing an ocean bottom node in a cavity of an autonomous underwater vehicle; releasing the autonomous underwater vehicle to a sea floor; and recording marine seismic data while the ocean bottom node is coupled to the sea floor.

The invention relates to the technical field of ocean observation, in particular to an ocean bottom layer heat wave prediction method and system based on a generative adversarial network and computer device.The method comprises the steps that a data set is established, satellite remote sensing data and reanalysis data of the ocean surface are preprocessed based on longitude and latitude grids, and a multi-dimensional data set is constructed; and a bottom layer heat wave prediction step: based on a pre-trained heat wave prediction model, feature extraction is performed on the multi-dimensional data set, the heat wave prediction model outputs a prediction result by using a generator, and the generator is obtained by training confrontation based on historical heat wave phenomenon data of the ocean bottom layer and a discriminator. The method can effectively predict ocean bottom layer heat waves, thus improving deep sea heat wave phenomenon perception capability and response efficiency.

A system and method for deploying and retrieving a plurality of ocean bottom seismic nodes to and from the seabed by using a floating platform. The system comprises an autonomous underwater vehicle (AUV) (101) coupled to a node skid (131) that is configured to handle a plurality of ocean bottom seismic nodes. The AUV and coupled skid may be lowered to and raised from the seabed and a platform in a garage. The AUV may comprise one or more fuel cells in addition to or as a replacement of traditional rechargeable batteries. The system may utilize an unmanned underwater vehicle (UUV) or unmanned surface vehicle (USV) to monitor and track AUV deployment and to provide acoustic communications between the surface platform and the AUV.

The present invention discloses a method, system, and electronic device for quickly fitting a Biot model parameter curve. The method comprises: obtaining ocean bottom sediment data, determining an initial parameter value for each sediment parameter based on the ocean bottom sediment data; constructing a preliminary curve of the Biot model based on the initial parameter values; performing a sensitivity analysis on the Biot model to obtain a weight coefficient for each parameter; performing a piecewise fitting based on the Biot model by combining measured data with a preset frequency segment; and, during the fitting process, searching for a target fitting result of the Biot model using a particle swarm optimization algorithm. The present invention achieves accurate fitting of the Biot model parameter curve by combining the sensitivity analysis and piecewise fitting methods and utilizing the particle swarm optimization algorithm, thereby not only improving fitting efficiency but also more accurately reflecting the characteristics of seabed sediments. This provides strong support for marine geological exploration and resource development, and can be widely applied in the field of data processing technology.

An ocean bottom node multi-component rotation quality control method based on a cross-correlation principle, comprising: acquiring P component data collected by an ocean bottom node and rotated X, Y and Z three-component data, and separating P, X, Y and Z four-component data (S1); preprocessing the separated four-component data (S2); acquiring a comprehensive polarity analysis graph of a P component on the basis of the P component data in the preprocessed four-component data (S3); separately calculating correlation coefficients between P component hydrophone data and rotated X, Y, and Z three-component geophone data (S4); forming a polarity analysis graph of rotated X, Y and Z components on the basis of a polarity quality control graph of the P component and the correlation coefficients between the P component hydrophone data and the rotated X, Y and Z three-component geophone data (S5); and performing quality control on the rotation effect of the rotated X, Y and Z three-component data on the basis of the polarity analysis graph of the rotated X, Y and Z components (S6). Also provided is an ocean bottom node multi-component rotation quality control apparatus based on a cross-correlation principle.

A system and a method for arrangement and recovery of an ocean bottom node are disclosed. The system for arrangement and recovery of an ocean bottom node, according to the present invention, comprises: an ocean bottom node (OBN) disposed on the seabed; a movement path prediction device for predicting a movement path along which the OBN moves from the sea surface to the ocean bottom in response to a marine area in which the OBN is disposed; and a drop point calculation device for setting a seabed point at which the OBN for the marine area is disposed, and calculating a drop point of the OBN on the sea surface corresponding to the set seabed point on the basis of the movement path predicted by the movement path prediction device.

It is proposed a seismic data acquisition device (400) intended to be placed on an ocean bottom floor, comprising a polymeric casing (412) defining a chamber that houses at least art of a data acquisition system (440, 444, 445); and a metallic device (414) in which the polymeric casing (412) is trapped, the metallic device (414) comprising two metallic beams (4141, 4142) that extend on opposite sides of the polymeric casing (412). It is also proposed a method for assembling such a device and a corresponding method for seabed seismic data acquisition.

A method may include ocean bottom sensor (OBS) acquisition designed for complex earth model building and imaging with full waveform inversion (FWI) technology. Various combinations of OBS source and receiver patterns, as well as source design may be validated with FWI sensitivity kernel analysis technique. Usually, OBS design is done using conventional methods based on wavelength, frequency requirements, ray tracing and rules of thumps. The method of the disclosed embodiments utilizes OBS design and acquisition combined with FWI sensitivity kernel analysis.

The invention discloses a continuous missing original data filling method for bottom-supported acoustic wave observation, and relates to the technical field of ocean bottom-supported acoustic wave observation, and the method comprises the steps: decomposing an original time sequence into different feature subsequences through a singular spectrum analysis algorithm, and extracting a trend component and a transient change component; a trend component missing part is subjected to fitting through a BP neural network according to existing time sequence data to generate overall trend component data to complete filling of missing data; according to the transient change component, filling of missing data of each part of the data is completed through a GRU-DTW neural network model according to forward and backward complete time sequence data of a transient component missing data period; and after data filling is completed, complete original data are reconstructed and formed and are used for statistical calculation of wave characteristic values. According to the method, the original states of different numbers of continuous missing data are efficiently restored, and the measurement accuracy of the wave height and the wave period is improved.

A system and method for deploying and retrieving a plurality of ocean bottom seismic nodes to and from the seabed by using a floating platform. The system comprises an autonomous underwater vehicle (AUV) coupled to a node skid that is configured to handle a plurality of ocean bottom seismic nodes. The AUV and coupled skid may be lowered to and raised from the seabed and a platform in a garage. The AUV may comprise one or more fuel cells in addition to or as a replacement of traditional rechargeable batteries. The system may utilize an unmanned underwater vehicle (UUV) or unmanned surface vehicle (USV) to monitor and track AUV deployment and to provide acoustic communications between the surface platform and the AUV.

A correlated sparse nodes and mini-streamers system for collecting seismic data includes plural nodes distributed on the ocean bottom, and a mini-streamer spread that includes plural mini-streamers. The plural nodes and the mini-streamer spread are configured to simultaneously collect seismic data from a surveyed subsurface, and wherein a length of the mini-streamers is equal to or less than three times an inline distance between adjacent nodes of the plural nodes.

The invention discloses an in-situ measurement system for ocean bottom layer suspended matter flux, which comprises a light source, a frame structure, a support structure, a plurality of cameras, a support adjusting module, an attitude sensor, an optical fiber and a control module, and is characterized in that the control module is connected with the light source, the cameras, the support adjusting module and the attitude sensor through the optical fiber; the light source and the camera are placed in the frame structure through the support structure, and the attitude sensor is arranged in the frame structure; the support adjusting module is used for adjusting the height of the support structure to adjust the height from the light source and the camera to the seabed; and the control module is used for receiving attitude information sent by the attitude sensor and video information sent by the plurality of cameras, sending a control instruction and calculating the flux of suspended solids at the bottom layer of the ocean according to the video information. The embodiment of the invention can improve the accuracy of measuring the flux of the marine bottom layer suspended solids. The method can be widely applied to the technical field of marine survey.

The invention discloses an intelligent detection robot for nuclear radiation in a marine environment. The intelligent detection robot comprises a robot body, an in-water walking driving device, a nuclear radiation monitoring device and a power supply device, an in-water walking driving device is installed on the machine body and used for driving the machine body to ascend and descend in water. A nuclear radiation monitoring device is installed in the machine body and comprises a nuclear radiation detection execution module, a control module and a motor driving module, the nuclear radiation detection execution module is used for detecting the nuclear radiation intensity in water, and the output end of the nuclear radiation detection execution module is connected to the control module; the output end of the control module is connected to the control end of the motor driving module, and the power supply device supplies power to the in-water walking driving device through the motor driving module. The intelligent detection robot for nuclear radiation in the marine environment solves the problem that nuclear radiation at the bottom of the sea cannot be detected in the prior art.

The invention belongs to the technical field of ocean engineering, and discloses an ocean subsurface buoy system and a control method thereof.The ocean subsurface buoy system comprises a communication buoy and a subsurface buoy, the subsurface buoy is electrically connected with the communication buoy through a communication cable, and a buoy retracting and releasing device is arranged on the subsurface buoy and connected with the communication buoy through a connecting cable; the communication buoy is provided with a first position and a second position, the buoy winding and unwinding device is used for achieving switching of the communication buoy between the first position and the second position by winding and unwinding the connecting cable, the communication buoy is located on the ocean water surface when the communication buoy is located at the first position, and the communication buoy is located outside the ocean internal subsurface buoy when the communication buoy is located at the second position. According to the ocean subsurface buoy system, the subsurface buoy and the communication buoy are physically separated, the subsurface buoy is always kept at the underwater safe depth, and the micro communication buoy is released to the water surface for short-time communication only when needed and is recovered immediately after communication is finished, so that the contradiction between the concealment and the communication capability is solved, and the survivability and the task cycle of the system are improved.