94results about "Seismic data acquisition" patented technology

The invention belongs to the technical field of geophysical monitoring, and relates to an electromagnetic interference detection method for earthquake monitoring, which comprises the following steps: deploying a multi-dimensional electromagnetic field sensing unit and an earthquake signal acquisition unit and realizing high-precision synchronization; synchronously acquiring multi-dimensional electromagnetic field and seismic physical signal data; performing multi-feature and noise feature extraction on the two; inputting the features into a pre-trained machine learning / deep learning model for identification, and outputting information such as interference type, intensity and azimuth angle; and carrying out influence evaluation and quality marking on the seismic data according to the output, and selectively inhibiting or compensating. Through the above scheme, multi-dimensional perception and characterization, high-precision synchronization and correlation analysis, intelligent identification and spatial positioning are realized, and the reliability and accuracy of earthquake monitoring data are significantly improved.

The invention discloses a background noise body wave extraction method and device based on distributed optical fiber acoustic sensing, and the method comprises the steps: obtaining an original phase difference signal along an optical fiber channel through a distributed optical fiber acoustic sensing system, and converting the original phase difference signal into strain rate data according to system demodulation parameters; performing preprocessing such as noise suppression and frequency energy balance on the strain rate data; calculating an autocorrelation function for the preprocessed signal, and superposing autocorrelation results of a plurality of time segments; performing band-pass filtering on the superposition autocorrelation function in a target frequency band, and extracting a body wave reflection response in background noise; and in order to eliminate the influence of the zero-time pulse in the shallow layer or weak reflection signal, carrying out mean value removal processing on the extraction result along the space direction to obtain a zero-offset body wave reflection response. The method can effectively describe the discontinuity from a superficial sedimentary layer and a fracture to a deep mourhua surface and even a lithosphere, and makes up for the defects of a conventional seismic station method.

A method for monitoring subterranean hydrocarbon storage sites includes simulating a seismic experiment using a baseline model. The method also includes perturbing the baseline model to produce one or more perturbed baseline models. The method also includes selecting a plurality of candidate acquisition geometries to probe the one or more perturbed baseline models. The method also includes extracting a set of simulated data from the simulated seismic experiment that corresponds to the plurality of candidate acquisition geometries. The method also includes executing a model probing exercise for the extracted set of simulated data for each candidate acquisition geometry and each of the one or more perturbed baseline models.

A system and method for designing a seismic survey including selecting a seismic survey grid as a basis for a seismic survey design and looping through the steps of generating off-the-grid locations by imposing spatial or temporal constraints on on-the-grid locations, 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, mapping the pre-selected domain to a rank-revealing domain using a pre-selected operator, applying a pre-selected process to minimize a rank of the off-the-grid locations in the pre-selected domain, and updating the seismic survey design based on which of the off-the-grid locations has the minimum rank until a pre-selected threshold is met indicating an optimal seismic survey design. The system and method include acquiring seismic data using the optimal seismic survey design, and enabling performing a wellsite action based at least on the seismic data.

A system and method for designing a seismic survey including selecting a seismic survey grid as a basis for a seismic survey design and looping through the steps of generating off-the-grid locations by imposing spatial or temporal constraints on on-the-grid locations, 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, mapping the pre-selected domain to a rank-revealing domain using a pre-selected operator, applying a pre-selected process to minimize a rank of the off-the-grid locations in the pre-selected domain, and updating the seismic survey design based on which of the off-the-grid locations has the minimum rank until a pre-selected threshold is met indicating an optimal seismic survey design. The system and method include acquiring seismic data using the optimal seismic survey design, and enabling performing a wellsite action based at least on the seismic data.

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.

System and method operable to estimate directional gradients of a seismic wavefield from seismic data from a seismic survey. The operations include receiving the seismic data describing the seismic wavefield, estimating the directional gradients, from the seismic data, of the seismic wavefield along one or more directions, using the seismic wavefield and the directional gradients to perform an action, creating interpolated data using the seismic wavefield and the directional gradients for interpolation, identifying a subset of the interpolated data based on pre-selected criteria, determining residual data based on a difference between the subset and the seismic wavefield, estimating the directional gradients from the residual data, and displaying the directional gradients.

A method can include can include tracking machine generated interactions with a computational framework to perform a workflow related to a reservoir, where the workflow generates output data using input data that characterizes the reservoir; identifying non-useful interactions that do not contribute to generation of the output data; generating a representation of the workflow that does not include the non-useful interactions; and storing the representation of the workflow to a workflow inventory.

A method of performing a field (100) measurement is disclosed. The method comprises: arranging a landing dock (122) at a target location in the field, the landing dock (122) coupled to a fiber optic cable (123) for distributed fiber optic sensing measurements; guiding an unmanned aerial vehicle (UAV) (150) to land on a landing dock, the UAV (150) comprising an interrogator unit (151); communicatively coupling the interrogator unit (151) and the fiber optic cable (123) in response to the UAV landing on the landing dock (122); transmitting, by the interrogator unit (151), the light pulses to the fiber optic cable (123); receiving backscattered light from the fiber optic cable (123) in response to transmitting the light pulse; and generating, by the interrogator unit (151), a measurement of the target position based on the received backscattered light.

A method to perform measurements of a field (100) is disclosed. The method includes disposing a landing dock (122) at a target location in the field, the landing dock (122) being coupled to a fiber optic cable (123) for distributed fiber-optic sensing measurement, directing an unmanned aerial vehicle (UAV) (150) to land on the landing dock, the UAV (150) including an interrogator unit (151), communicatively coupling, in response to the UAV landing on the landing dock (122), the interrogator unit (151) and the fiber optic cable (123), sending, by the interrogator unit (151), a light pulse to the fiber optic cable (123), receiving, by the interrogator unit (151) and in response to sending the light pulse, a backscattered light signal from the fiber optic cable (123), and generating, by the interrogator unit (151) and based on the received backscattered light signal, a measurement of the target location.

To provide a seismic sensor, an earthquake detection method, and an earthquake detection program with which it is possible to appropriately produce outputs for the seismic ground motion, etc. of vibration strength detected in accordance with acceleration due to vibration.SOLUTION: A seismic sensor 10 comprises an acceleration acquisition unit 21, an acceleration waveform generation unit 22, a frequency detection unit 24, and an earthquake determination unit 25. The acceleration acquisition unit 21 detects vibration and measures the acceleration of vibration. The acceleration waveform generation unit 22 generates an acceleration waveform that indicates a relationship between the acceleration measured by the acceleration acquisition unit 21 and an elapsed time. The frequency detection unit 24 detects, by a zero-cross scheme, the frequency of the acceleration waveform generated by the acceleration waveform generation unit 22. The earthquake determination unit 25 determines whether or not being an earthquake, on the basis of the frequency detected by the frequency detection unit 24.SELECTED DRAWING: Figure 2

A method to perform measurements of a field (100) is disclosed. The method includes disposing a landing dock (122) at a target location in the field, the landing dock (122) being coupled to a fiber optic cable (123) for distributed fiber-optic sensing measurement, directing an unmanned aerial vehicle (UAV) (150) to land on the landing dock, the UAV (150) including an interrogator unit (151), communicatively coupling, in response to the UAV landing on the landing dock (122), the interrogator unit (151) and the fiber optic cable (123), sending, by the interrogator unit (151), a light pulse to the fiber optic cable (123), receiving, by the interrogator unit (151) and in response to sending the light pulse, a backscattered light signal from the fiber optic cable (123), and generating, by the interrogator unit (151) and based on the received backscattered light signal, a measurement of the target location.

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.

An invention that relates to streamers is described. These streamers contain one or more streamer sections. These sections can have sensors, channels, and / or analogue arrays of sensors are disposed along its length. At least one of these streamer sections has a variable density of sensors, channels, and / or analogue arrays along the length.

The invention belongs to the technical field of marine exploration equipment, and discloses an acquisition and transmission module and an offshore seismic exploration acquisition cable using the same. The acquisition and transmission module is embedded in a reserved window of an acquisition cable, and comprises two waterproof end blocks which are in fusion connection with a cable core wire and a cable sheath layer and are used for axial limiting and end sealing; the protective shell is internally provided with a space for accommodating the acquisition control circuit board; the two fixing end caps are used for fixing the shell; the limiting assembly is composed of a lining ring, a limiting block and a limiting supporting column and connected between the waterproof end block and the fixing end cap. The acquisition and transmission module fills gaps of all parts through an internal adhesive structure so as to be solidified into a whole, and the exterior is integrally wrapped by an injection molding protective layer. According to the acquisition and transmission module, the problems that the module is easy to loosen, poor in sealing and difficult to maintain in a complex marine environment are solved, and the stability and reliability of seismic data acquisition are remarkably improved.

Embodiments relate to data acquisition units or nodes and more specifically to seismic data acquisition units or nodes for use in data gathering for ambient noise tomography (ANT). Some embodiments relate to a method for data acquisition, and systems employing one or more data acquisition units. Some embodiments relate to systems comprising one or more satellites in communication with one or more data acquisition units for communication to a remote server, for remote storage, and processing for creating sub-surface tomography images accessible to client devices.

According to one embodiment, a near-field data is used to determine a taper length that can isolate the source signature at the top of near-field data with minimum interaction with the Green's function. In some embodiments, a range of taper lengths is selected and for each length after tapering the near-filed data, converting each filtered near-field data to its minimum-phase equivalents. Summing pairwise cross-correlation of all of the minimum-phase equivalent wavelets at the zero-lag provides an attribute that shows how much the tapered portions of the near-field data look alike. An acceptable taper size will be the one that has the highest summation value. Finally, the average of the minimum-phase equivalents of tapered near-field data with the selected taper size is the estimated source signature.

The invention belongs to the technical field of geological exploration, and particularly discloses a symmetrical excitation anti-explosion geological exploration system and method, and the method comprises the steps: receiving array multi-channel signals at two sides, and carrying out the time alignment correction of all channel signals, so as to eliminate the time delay; a multi-channel cross-correlation matrix between the left array and the right array is constructed based on the aligned signals, and matrix elements are obtained through integral cross-correlation operation of array channel signals on the two sides; performing low-rank decomposition on the cross-correlation matrix, and extracting the first k main components as public noise modes; carrying out inversion calculation on the contribution of each noise mode in each acquisition channel, and reconstructing a channel noise component; and subtracting the reconstructed noise component from the original signal, and outputting a purified geological reflection signal. The method does not need special hardware, can accurately suppress the homologous low-frequency noise of the tunnel, improves the signal-to-noise ratio of the signal and the geological imaging resolution, and is suitable for geological detection of closed spaces such as the tunnel.

A multi-dimensional integrated monitoring system and method for underground engineering. The system comprises a point monitoring module (1) mounted on a plurality of first monitoring sections (01) of underground engineering, a line monitoring module mounted on a plurality of second monitoring sections (02), an area monitoring module mounted on a tunnel face (03), a volume monitoring module mounted on a plurality of third monitoring sections (04), and a data analysis platform for receiving and analyzing first feature information collected by the point monitoring module (1), second feature information collected by the line monitoring module, third feature information collected by the area monitoring module, and fourth feature information collected by the volume monitoring module. The system provided in the present application solves the problems of incapability of forming a unified system in which monitoring means are integrated to each other in underground engineering and incapability of comprehensively reflecting the overall situation of engineering.

The invention relates to a seismic oscillation simulation method matched with a long-period response spectrum, and the method achieves the high-precision representation of a 0.03-20 s full-band seismic oscillation characteristic through expanding a response spectrum analysis period to 20 seconds and constructing a low-frequency characteristic seismic oscillation database. According to the method, the limitation that attenuation of a traditional model is too fast in an amplitude drop section is broken through, and a seismic oscillation input solution with broadband spectrum matching precision and geological environment physical characteristic fidelity is provided for aseismic design of long-period structures such as a super high-rise building.

Multicomponent seismic data 1a and fibre optic seismic data 1b is provided for a region. The data is input 2 into the neural network to train it to predict multicomponent seismic data from fibre optic

The invention discloses a seismic source on-the-road automatic layout method, a storage medium and equipment, and the method comprises the steps: automatically calculating the position of a selected road seismic source after setting a seismic source point spacing distance through employing the vector data of a road, calculating the number of times of coverage, reducing the spacing distance if the number of times of coverage is not satisfied, and automatically calculating the position again. And the coverage times meet the requirements. The vibroseis points can be quickly arranged along the road, and the arrangement positions of the vibroseis points are efficiently obtained.

Some embodiments relate to a method of controlling seismic sensing nodes for ambient noise tomography (ANT). The method includes: transmitting a sensing initiation command simultaneously to a plurality of the seismic sensing nodes to cause the seismic sensing nodes to begin passive seismic sensing for ANT, each of the seismic sensing nodes being deployed as part of a spaced array of seismic sensing nodes, the spaced array extending across a region of interest, the seismic sensing nodes having their own respective power supplies, vibration sensors, and communication componentry; receiving sensor data from the seismic sensing nodes while the seismic sensing nodes remain deployed across the region; generating a geophysical model of a sub-ground region in the region of interest based on the received sensor data; and transmitting a sensing termination command simultaneously to the seismic sensing nodes to cause the seismic sensing nodes to stop the passive seismic sensing.

Systems and methods are provided for generating a model for detection of seismic events. In this regard, one or more processors (220) may receive from one or more stations (110, 120, 130) located along an underwater optical route (100), one or more time series of polarization states (SI, S2, S3) of a detected light signal during a time period. The one or more processors (220) may transform the one or more time series of polarization states (S 1, S2, S3) into one or more spectmms in a frequency domain. Seismic activity data for the time period may be received by the one or more processors (220), where the seismic activity data include one or more seismic events detected in a region at least partially overlapping the underwater optical route (100). The one or more processors then generate a model for detecting seismic events based on the one or more spectmms and the seismic activity data.

The invention discloses a coal mine rock burst micro-seismic monitoring method and system. The method comprises the following steps: collecting multi-dimensional geological data to construct a three-dimensional geological structure model; performing monitoring area division on the target coal mine, and analyzing rock burst risk grades of different monitoring areas; screening an optimal layout scheme; receiving underground seismic wave signals of the target coal mine in real time; calculating a focus position and an intensity grade; evaluating the effectiveness of the optimal layout scheme, and optimizing the optimal layout scheme; according to the system, a data acquisition module comprises multiple groups of sensors; the geological data receiving module is used for receiving multi-dimensional geological data; the model construction module is used for constructing a three-dimensional geological structure model; the risk division module is used for determining a rock burst risk level; the scheme generation module is used for screening an optimal layout scheme; the data processing module is used for processing the signals; the micro-seismic analysis module is used for calculating a seismic source position and an intensity grade; and the feedback optimization module is used for optimizing the optimal layout scheme. According to the invention, accurate positioning of the seismic source and accurate calculation of the intensity can be realized.

Systems and methods are provided for generating a model for detection of seismic events. In this regard, one or more processors (220) may receive from one or more stations (110, 120, 130) located along an underwater optical route (100), one or more time series of polarization states (S1, S2, S3) of a detected light signal during a time period. The one or more processors (220) may transform the one or more time series of polarization states (S1, S2, S3) into one or more spectrums in a frequency domain. Seismic activity data for the time period may be received by the one or more processors (220), where the seismic activity data include one or more seismic events detected in a region at least partially overlapping the underwater optical route (100). The one or more processors then generate a model for detecting seismic events based on the one or more spectrums and the seismic activity data.

Systems and a method are disclosed. The method includes obtaining a plurality of raw seismic datasets for a subterranean region of interest, wherein each raw seismic dataset is generated by a high-speed train traversing a train track at a unique speed. The method further includes determining a plurality of processed seismic datasets by processing each of the plurality of raw seismic datasets and determining a final seismic dataset by combining the plurality of processed seismic datasets. The method still further includes identifying subterranean features within the subterranean region of interest using the final seismic dataset.

The invention provides a seismic exploration observation system data generation method, which comprises the following steps of: 1, acquiring observation system data or parameters, and extracting an excitation point, a receiving point and relation information between the excitation point and the receiving point from the observation system data or parameters; 2, re-numbering the receiving points and the excitation points according to three-dimensional space position distribution, and respectively storing the receiving points and the excitation points in receiving point information and excitation point information; step 3, establishing receiving group information according to the receiving point information; 4, establishing excitation group information, excitation set information and receiving set information; and step 5, respectively establishing relation information of the excitation group and the receiving group, and receiving and storing the relation information of the excitation group and the receiving group. The seismic exploration observation system data generation method can be compatible with requirements of a new exploration technology, richer relation information between excitation points, between receiving points and between excitation and receiving is established, and observation system data with comprehensive information and efficient access is provided for processing offset, forward inversion and the like after data acquisition.

A method for identifying a frequency producing a dominant vibration response of an underground structure includes the steps of inducing controlled acoustic waves in the structure via ground, the acoustic waves varying over a predetermined frequency range, measuring vibration response associated with the structure in response to the controlled acoustic waves over the predetermined frequency range, using a measurement device in vibrational communication with the structure, detecting a dominant vibration response among measurements across all frequencies of the predetermined frequency range, and, identifying a frequency of the predetermined frequency range which produced the dominant vibration response.

A system for seismic event prediction uses seismic sensors and non-seismic sensors to collect real-time data at one or more sites. One or more processors receive the data, align it into time-synchronized windows, and generate modality-specific features. The system executes at least one predictive pathway selected from: a seismic model trained on seismic features, a non-seismic model trained on non-seismic features, a feature-fusion model trained on a joint representation of both, and a decision-fusion model that combines outputs of the seismic and non-seismic models. The system produces a model output indicating a likelihood of a seismic event within a prediction horizon and, in some cases, a magnitude estimate or time window, and generates an alert based on the output using region-configurable thresholds.