126 results about "Seismic survey" patented technology

The invention discloses a coal seam passive source seismic survey system and method based on deep learning, and relates to the technical field of coal mining safety monitoring and early warning, and the method comprises the following steps: S1, collecting the passive source seismic data of a coal seam area; s2, deep fusion features are extracted; s3, constructing a semi-supervised self-attention prediction network model; s4, extracting coal seam structure prediction parameters; s5, the corrected coal seam structure parameters are extracted; s6, constructing a fast seismic wave forward model, and calculating and outputting an initial model of the coal seam underground structure; s7, constructing a Transform optimization network, and extracting a depth feature vector; and S8, constructing a coal seam structure inversion model, and training iteration by using the improved batch depth Bayesian optimization algorithm. The method overcomes the limitation of manual analysis and slow response in a traditional coal seam seismic survey method, and provides an efficient and accurate solution for safe production of a coal mine.

A method can include receiving seismic data of a seismic survey of a subsurface region; performing a full waveform inversion using the seismic data and a model of the subsurface region to determine one or more characteristics of the subsurface region, where the model of the subsurface region includes one or more angle-dependent model parameters; and outputting the one or more characteristics of the subsurface region.

The present invention discloses a method and system for detecting thin coal seams based on the attenuation of the period amplitude of refracted waves, including: S1 Instrument layout: The seismic survey line consists of S excitation points and R receiving points; the total number of seismic data d i (t) is formed through signal acquisition and data transmission between the excitation points and the receiving points; S2 Obtaining formation data and calculating the refracted wave period: Obtaining the longitudinal wave velocity v r of the surrounding rock and the longitudinal wave velocity v c of the coal seam, measuring the thickness h of the coal seam exposed in the roadway on the sidewall of the roadway, and calculating the refracted wave period T; S3 Processing d i (t) to obtain the seismic data s i (t) after deconvolution and in-trace equalization; obtaining the amplitude ratio of the seismic data s i (t) to the reference trace s0(t) at the n p th order as the refracted wave period amplitude coefficient a p of point P, and the numerical value of a p reflects the thickness of the coal seam at point P. The refracted wave of the coal seam used in the present invention is another underground seismic wave generated simultaneously with the trough wave. Using the refracted wave can more accurately interpret the boundary of the thin coal seam, improving the coal mining work efficiency and resource utilization rate.

The invention provides a seismic survey instrument for detecting underground geological structures, which belongs to the technical field of geological prospecting, and comprises a frame, a battery box mounted in the top end of the frame, a push plate mounted at the bottom end of a spring buffer, and a signal transmitter mounted on one side in the push plate, the leveling structure comprises a connecting arm rotationally connected to one side of the interior of the frame, a scraping plate fixed to one side of the interior of the housing and a transmission assembly arranged on one side of the housing. According to the ground leveling device, a driving motor is started to drive a rotating shaft to rotate, a scraper conducts leveling operation on the ground, the leveling depth is adjusted through stretching of a second electric push rod, and therefore the ground leveling function of the device is achieved, it is guaranteed that the device is in a horizontal state, and a detection unit is tightly attached to the ground; interference of external factors on observation data of the device is reduced, effective receiving and transmission of signals are ensured, and the reliability of survey results is improved.

The invention relates to a near-surface longitudinal wave velocity modeling method and device based on micro-motion exploration, and the method comprises the steps: obtaining a surface survey-based ground geological map of a target work area, and correcting a geological boundary of the surface survey-based ground geological map; according to stratum, fault and stratum occurrence information provided by the corrected ground geological map, a geological cross section is drawn along a seismic survey line, and a shallow ground structure model of the target work area is obtained; obtaining the shallow surface shear wave velocity of each preset measuring point in the target work area, and converting the shallow surface shear wave velocity of each preset measuring point into a longitudinal wave velocity; with the shallow ground structure model as a constraint, spatial interpolation is carried out on the longitudinal wave velocity of each preset measuring point to obtain a near-surface longitudinal wave velocity model based on the shallow ground structure model and a shallow velocity field based on the shallow ground structure model, the inversion velocity is close to the stratum velocity, and the precision is high; and a good near-surface longitudinal wave velocity model is provided for subsequent pre-stack depth migration.

A method can include receiving seismic survey data of a subsurface environment from a seismic survey that includes a source arrangement of sources that is spatially denser than a receiver arrangement of receivers; processing the seismic survey data using the principle of reciprocity for performing interpolation across the receivers to generate processed seismic survey data; and generating an image of at least a portion of the subsurface environment using the processed seismic survey data.

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.

The invention provides a crustal stress prediction method and device, electronic equipment and a storage medium, and relates to the technical field of seismic survey. The method comprises the following steps: obtaining observation seismic data of seismic wavelets in a strong VTI medium, and constructing a to-be-inverted parameter matrix based on a PP wave reflection coefficient corresponding to the strong VTI medium; constructing a posterior probability function obeyed by an inversion parameter matrix corresponding to the to-be-inverted parameter matrix based on a Bayesian inversion theory and observation seismic data, and determining a target functional based on a prior probability function and a likelihood function corresponding to the posterior probability function; determining medium density and each stiffness matrix coefficient based on an inversion parameter matrix solving result of the target functional, and determining a flexibility matrix of the strong VTI medium based on each stiffness matrix coefficient; and predicting the ground stress distribution of the target profile in the strong VTI medium based on the medium density and the positive strain matrix and the flexibility matrix corresponding to the strong VTI. Therefore, the crustal stress prediction accuracy under the strong VTI medium is improved.

A method can include generating a visual group of datasets; receiving a visualization mesh that intersects at least two of the datasets; executing a shader using graphics hardware to generate values for the visualization mesh, where the values depend on data within at least one of the at least two datasets; and rendering a visualization to a display using the values.

The invention discloses a method and a device for inverting a high-order frequency dispersion curve of a seafloor node Schelt wave. The method comprises the following steps: determining the distance between reference points according to seismic data arrangement information, and setting a plurality of reference points on a target section where a seismic survey line is located; according to the maximum offset distance and the minimum offset distance, common receiving point sub-gathers are screened from a common receiving point Schelt channel set of each seabed node, sub-gathers are intercepted from the common receiving point sub-gathers according to the reference point position information and the maximum distance, and the sub-gathers with the length not smaller than the minimum length form the gathers of the reference points; determining a frequency dispersion energy spectrum of each sub-gather in the reference point gather to obtain a superposed frequency dispersion energy spectrum of the reference point; and picking up a high-order frequency dispersion curve by superposing a frequency dispersion energy spectrum, and carrying out seismic inversion modeling. According to the method, through screening of available trace gathers of reference points and determination and superposition of frequency dispersion energy spectrums, an energy-enhanced superposed frequency dispersion energy spectrum is obtained, so that high-resolution seismic modeling can be realized based on extracted high-order frequency dispersion curve inversion.

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.

In survey configurations for towed streamer shallow target investigations, seismic sources are placed in one or more of several zones disposed at different inline offsets relative to the streamers. In some embodiments, a vessel tows a set of one or more streamers along with a set of one or more sources disposed aft of the tail end of the streamers. In other embodiments, a vessel tows a set of one or more streamers, a set of one or more near offset sources disposed forward of the front end of the streamers, and a set of one or more far offset sources disposed forward of the near offset sources.

The invention discloses a multiple sample library construction method, system and device and a storage medium, and the method comprises the steps: obtaining the ocean stratum data of a target sea area, and determining an ocean stratified geologic model comprising a seawater layer geologic model according to the ocean stratum data; obtaining forward modeling data; the forward modeling data is obtained according to a preset forward modeling observation system; based on a preset boundary condition, respectively inputting the forward modeling data into an ocean stratified geologic model and a seawater layer geologic model for calculation to obtain first seismic record data and second seismic record data; performing calculation based on the first seismic record data and the second seismic record data, and determining a multiple wave sample data set; and performing sample augmentation and normalization processing based on the multiple wave sample data set, and determining a multiple wave sample library of the target sea area. According to the embodiment of the invention, the overall accuracy of the constructed free surface multiple sample library can be improved, and the method can be widely applied to the technical field of seismic survey.

A computer-implemented method includes: accessing ground-force signal traces measured at each source location when applying a pilot sweep signal characterized by a sweeping instantaneous frequency that includes a fundamental component, wherein each ground-force signal trace comprises a fundamental mode signal component as well as at least one harmonic mode signal component; obtaining an analytic function representation for the pilot sweep signal and each ground-force signal trace, wherein the analytic function representation comprises a phase portion; establishing a matrix representation characteristic of the phase portion of the analytic function representation for the fundamental component in the ground-force signal, and wherein the matrix representation is size limited; retrieving, from the analytic function representation for each ground-force signal trace and after inverting the matrix representation, the fundamental mode signal component of the ground-force signal trace; and providing the retrieved fundamental mode signal component of each ground-force signal trace for subsequent data processing.

The invention discloses a rapid comprehensive survey method and system for natural hydrogen resources, and the method comprises the steps: rapidly delineating a prospective area through remote sensing and geochemical measurement, fusing aviation gravity and magnetism, earthquake, time-frequency electromagnetism and ground geological survey multi-source data, finding out the characteristics of hydrogen source rock, a migration channel, a reservoir stratum and a cover stratum through the integrated evaluation of source-communication-storage-cover, and carrying out the comprehensive survey of the natural hydrogen resources. A target area is optimized through multi-information fusion, drilling verification is carried out, and efficient exploration of natural hydrogen resources is achieved. According to the method, the potential of the natural hydrogen resource can be rapidly and accurately evaluated.

System and method for designing dithers having a pre-determined distribution within a dithers range, wherein the dithers range is chosen for the seismic survey, wherein a lower boundary of the dithers range is 4 seconds or +2 seconds dithers distribution relative to nominal shotting times of sources of seismic waves in the seismic survey, and wherein an upper boundary of the dithers range is a largest value compatible with constraints of the seismic survey.

Systems and methods for building a near surface velocity model for a subsurface formation include obtaining seismic data representing a subsurface formation; forming seismic gathers based on the seismic data; and determining uphole vertical velocities for the subsurface formation based on uphole seismic survey data. A training dataset is formed including input features that include a subset of the seismic gathers and labeled output data that includes the uphole vertical velocities corresponding to the subset of seismic gathers. A machine learning model is trained using the training dataset; and a near surface velocity model is generated for the subsurface formation using the machine learning model that takes as input the seismic gathers.

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 computer-implemented method includes: accessing wireline data and vertical seismic profiling (VSP) data; correlating logged velocity from the wireline data with velocity data from the VSP data to calibrate the logged velocity; determining, based on, at least in part, the calibrated logged velocity, a range of incidence angles for acquiring seismic traces sufficient to map a formation depth at the geo-exploration site using pairs of acoustic emitter and acoustic receiver placed at a surface of the geo-exploration site; and determining a range of offsets between the acoustic emitter and the acoustic receiver of each pair so that the acoustic receiver can acquire seismic traces sufficient to map the formation depth at the geo-exploration site; and comparing the range of angles and the range of offsets with acquisition parameters of a planned seismic survey to determine whether the planned seismic survey can map as deep as the formation depth.

The construction of an uphole-calibrated velocity model from uphole seismic survey data using a machine learning model. Uphole seismic survey data may be processed to obtain seismic travel times sorted in a midpoint-offset domain. The machine learning model may be trained with pairs of training data that include travel time vs offset and uphole time, travel times vs offset and uphole velocity, and travel times vs. offset and seismic velocity determined from an interval velocity interpretation of uphole times. The trained machine learning model may output calibrated pseudo uphole velocities having a vertical resolution comparable to the existing upholes.

A method for discovering geofeatures in a subterranean formation includes receiving first input data including training seismic surveys. The method also includes training a model based on the training seismic surveys to produce a pre-trained model using a self-supervised learning (SSL) technique. The method further includes receiving second input data. The second input data includes one or more target seismic surveys associated with the subterranean formation. The method also includes generating geological representations of the subterranean formation using the pre-trained model and based on the one or more target seismic surveys. The method also includes generating a database based on the geological representations. The method also includes generating an output based on the database.

The application discloses a marine seismic survey line leveling method, a processing system and a storage medium, and comprises the following steps: acquiring a seismic operation survey line; extracting a seabed first arrival wave time value according to the seismic operation survey line; grouping the seismic operation survey line to obtain a main survey line group and a liaison survey line group; obtaining an intersection difference according to the seabed first arrival wave time value, the main survey line group and the liaison survey line group; calculating a difference adjustment value of the seismic operation survey line according to the intersection difference; and completing seismic survey line leveling according to the difference adjustment value. The application can quickly level the seismic survey line, reduce the closure error of the seismic survey line and improve the processing efficiency of the closure error of the seismic survey line by grouping the seismic operation survey line first, then calculating the intersection difference (i.e. the difference value of the seabed first arrival wave time value) of two groups of seismic operation survey lines in different directions, and finally calculating the corresponding difference adjustment value and adjusting all the seismic operation survey lines.

A system and method for time-lapse seismic data acquisition and processing using permanent or semi-permanent seismic sources, combined with a specialized processing workflow. The method is designed to reliably detect time-lapse changes in the structure and physical properties of subsurface formations over time by providing highly repeatable seismic surveys. This method includes optimizing the seismic source system based on the specific environment to determine the ideal sweep setups; establishing an efficient sweep schedule to maximize data quality while minimizing operational costs; creating a baseline seismic model by capturing seismic data over a predetermined time frame prior to production activities; and continuously acquiring and comparing time-lapse seismic data with the baseline to detect variations in seismic attributes that reflect structural or physical property changes in subsurface formations.

Systems, methods, and apparatus, including computer programs encoded on computer-readable media, for performing a seismic survey and characterization of a subsurface formation. Seismic sources coupled to a wellbore of a well system may emit source seismic signals. Seismic sensors coupled to the wellbore may detect seismic signals associated with the plurality of source seismic signals. The detected seismic signals may be reflected seismic signals, refracted seismic signals, or both. A seismic characterization of the subsurface formation may be performed based on analysis of the detected seismic signals and the plurality of source seismic signals. A change in a fluid front of the subsurface formation may be detected based on the seismic characterization of the subsurface formation. Inflow control devices that control fluid flow in a plurality of zones of the wellbore may be controlled based on the seismic characterization and a detected change in the fluid front.

The application discloses a method and device for identifying gas-bearing reservoirs, and the method comprises the following steps: establishing a reservoir longitudinal identification criterion according to well logging data and seismic data of a study area; extracting a plurality of seismic attributes from each seismic survey line in two-dimensional seismic data of the study area; determining optimal seismic attributes from the plurality of seismic attributes through comparative analysis; and determining a favorable reservoir distribution area according to the reservoir longitudinal identification criterion and the optimal seismic attributes.

Techniques are disclosed relating to deblending of sources in multi-source geophysical survey data, including marine or land-based data. Multiple sets of deblended receiver traces are generated by iteratively applying a coherency filter to estimated sets of deblended receiver traces and updating a residual until a termination condition is reached. In some embodiments, applying the coherency filter during a current iteration may include determining coefficients of the coherency filter based on estimated sets of deblended receiver traces from an immediately prior iteration. In further embodiments, applying the coherency filter may include applying a 3D projection filter, such as an fxy projection filter.

The invention relates to the field of seismic survey, in particular to a geophysical prospecting system and method for seismic survey, and the method comprises the steps: collecting earth surface information, and constructing an earth surface model; setting a virtual shot point in the earth surface model; simulation is carried out in the earth surface model, and forward modeling of seismic waves is carried out; an area where scattering interference generated by forward modeling internal seismic waves is larger than a preset value is extracted as a noise dense area, micro-logging adapting to the surface layer earth surface is set according to the earth surface model, the micro-logging is used for detecting the geological component structure of the noise dense area, and when the complexity of the geological component structure exceeds the preset value, the noise dense area is determined. Changing the position of a virtual shot point, triggering time and generated seismic wave parameters, and repeating simulation; and when the geological component structure complexity does not exceed a preset value, setting a compensation strategy corresponding to the noise dense area based on the geological component structure. According to the technical scheme of the invention, the method is used for reducing the superposition area of the wave interference noise and the complex geological noise of the superficial layer underground of the overlying earth surface, and improving the seismic survey effect.

Described herein is a method for performing a long offset refraction seismic survey of a subsurface area of interest using a fiber-optic cable (170) positioned on or under the earth's surface and extending between a first cable end (172) closer to the area of interest and a second cable end further from the area of interest, the method comprising: connecting an interrogator to an end of the fiber-optic cable, wherein the interrogator is configured to emit light into the cable through the end and detect reflected light from the cable; simultaneously steering and activating a low frequency seismic source and operating the interrogator to collect seismic refraction data; wherein steering the source comprises directing the source along a travel path that extends between a first source position closer to the area of interest and a second source position further from the area of interest, wherein the second source position is horizontally offset at least 9 km from the first cable end, and the cable and source travel path extend in opposite directions away from the area of interest, and processing the collected refraction data to build up an image of or extract information about the subsurface area of interest.

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.