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56 results about "Seismic noise" patented technology
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In geology and other related disciplines, seismic noise is a generic name for a relatively persistent vibration of the ground, due to a multitude of causes, that is a non-interpretable or unwanted component of signals recorded by seismometers.
First-arrival travel time picking method and device for seismic signal comprising noise
InactiveCN107272066AHigh first-to-picking qualityImprove picking qualitySeismic signal processingSliding time windowDecomposition
The invention discloses a first-arrival travel time picking method and device for a seismic signal comprising noise, and the method comprises the following steps: carrying out the decomposition of an original seismic signal s(t) comprising noise through a noise adaption complete set EMD (Empirical Mode Decomposition) method, and obtaining a series of finite IMF components from high frequency to low frequency and residual components; screening out a plurality of high-frequency IMF components according to an EIF effective index function, and carrying out the wavelet threshold denoising; carrying out the accumulation and reconstruction of the high-frequency IMF components denoised through wavelet threshold denoising and the high-frequency IMF components which are not denoised, i.e., obtaining the denoised seismic signal x(t); initially determining the first-arrival travel time t0 through an improved sliding time window energy ration method; calculating a local extreme value in a time window comprising the moment t0 through an AIC information criterion method, wherein the time corresponding to the extreme value is the precise first-arrival travel time t. According to the invention, the method can effectively improve the seismic noise inhibition effect and improve the picking precision of the first-arrival travel time, and creates the conditions for the accurate processing and explanation of the subsequent seismic data.
Owner:EAST CHINA UNIV OF TECH
Distributed system with shielded sensors
InactiveUS20100027235A1Lower the volumeReduce power consumptionMagnetic/electric field screeningSeismologyCavitationSignal processing
A sensing unit comprising sensor means enclosed in a casing made of a ferromagnetic material, to achieve a ferromagnetic shield. The sensing unit may further include signal processing means, also enclosed in the ferromagnetic casing.A distributed system for measuring, processing and displaying information from a plurality of sensors comprises a plurality of sensor units. A method for quick detection of offenders of oil, gas or other pipes, by monitoring the protective cathodic voltage and detecting quick changes in the voltage. A method for detecting leakage from a pipe using multiple channels / inputs, wherein a low frequency range input measures seismic noises, and a high frequency range input measures cavitation noises, and wherein a leakage indication is issued if both the low frequency and high frequency noises are simultaneously detected.
Owner:SAMUELSON JOSEF
Active noise injection computations for improved predictability in oil and gas reservoir discovery and characterization
Application of nonlinear resonance interferometry is introduced as a new geophysical approach to improve predictability in characterization of subsurface porosity, rock and fluid properties. In contrast to reflection methods that remove random information noise, nonlinear resonance interferometry exploits the full seismic acquisition spectrum to assess how low frequency and high-frequency noise is differentially and directly modulated by varying levels of porosity and hydrocarbon content in the lithologies of interest. In some examples, systems and techniques implement novel computational interactions between acquired seismic wavefield attributes and a nonlinear system in software to amplify distortions in seismic noise and exploits injection of synthetic noise, in software format, to detect hydrocarbon traps and lithology changes at spatial scales below seismic resolution, thereby increasing the information value of low-resolution data. The techniques are broadly applicable to de-risking conventional clastic and carbonate reservoirs and non-conventional shale gas resource prospects.
Owner:VIALOGY
Seismic image filtering machine to generate a filtered seismic image, program products, and related methods
ActiveUS8321134B2Faster and efficient attenuationLow cost2D-image generationSeismic signal processingWave fieldAcoustics
Seismic image filtering machines, systems, program products, and computer implemented methods are provided to generate a filtered seismic image responsive to filtered seismic image data generated by attenuating coherent seismic noise from surface waves of an unfiltered wavefield constructed from unfiltered seismic image data through a single downward extrapolation of the unfiltered wavefield using a plurality of nonstationary convolution operators to perform localized filtering at each of a plurality of spatial locations of the unfiltered wavefield. Various embodiments, for example, can beneficially handle strong lateral velocity variations thus making various embodiments effective tools to remove complicated coherent seismic noise which is typically in the form of exponentially decaying evanescent waves. Embodiments of the present invention, for example, can use, as a part of the filtering mechanism, specially designed nonstationary convolution operators that are implemented in the space-frequency domain as nonstationary filters.
Owner:SAUDI ARABIAN OIL CO
Seismic signal random noise suppression processing method
InactiveCN108267784AAvoid problems that are largely influenced by subjective factorsImprove problems such as poor denoising effectSeismic signal processingSingular value decompositionRandom noise
Owner:STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
In-well micro-seismic noise elimination method based on experience wavelet transformation and various threshold functions
InactiveCN108107475AReduce signal to noise ratioSeismic signal processingFrequency spectrumDecomposition
The invention discloses noise inhibition which is an important processing step in a micro-seismic signal processing process. Complete ensemble empirical mode decomposition CEEMD and wavelet transformation WT are widely applied to seismic noise elimination; however, the CEEMD is lack of theoretical foundations and the self-adaptability of the WT is relatively weak. Therefore, the noise eliminationeffect is poor. According to the invention, experience wavelet transformation (EWT) is combined with various threshold functions to carry out micro-seismic noise elimination for the first time. The EWT is used for establishing a self-adaptive wavelet filter group through spectrum segmentation to extract different frequency blocks of a detected signal. In the EWT, four types of spectrum segmentation methods are adopted; an experiment finds out that an adaptive algorithm can be used for separating an effective signal and noises of micro-seismic data very well; after the EWT is carried out, the signal can be divided into two components through analyzing a spectrum and energy of each module. A hard threshold function is applied to the component containing more effective signals and an improvedthreshold function is applied to the component containing less effective signals. An extraction method is compared with the CEEMD and the WT in an analogue signal and an actual signal to prove the effectiveness of a provided method.
Owner:JILIN UNIV
Adaptive hybrid norm dictionary learning seismic wave impedance inversion method
InactiveCN109143356AOvercoming non-Gaussian noiseAvoid influenceSeismic signal processingWell loggingAdaptive denoising
The invention provides an adaptive hybrid norm dictionary learning seismic wave impedance inversion method, and belongs to the field of seismic inversion. Through the combination of the post-stack wave impedance inversion in exploration geophysics with dictionary learning and denoising, the adaptive denoising and dictionary learning based post-stack wave impedance inversion method can be provided.The method adopts an adaptive hybrid norm objective function to replace an original 2-norm objective function, so that an objective function can better overcome non-gaussian noise; well logging information is introduced through a dictionary learning method, so that influences of different seismic noise can be effectively overcome, and the vertical resolution of inversion can be enhanced by fullyutilizing the well logging information; and compared with traditional methods of least squares, robustness can be stronger, the noise immunity and inversion result precision of the seismic wave impedance inversion can be enhanced, multiple solutions can be reduced, and convenient data processing in geological exploration can be achieved.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Ground array type micro seismic data independent component separation denoising method
InactiveCN105093317AImprove signal-to-noise ratioHelp to accurately identifySeismic signal processingSignal-to-noise ratio (imaging)Iterative method
The invention discloses a ground array type micro seismic data independent component separation denoising method, comprising the steps of performing packet processing for close demodulator channels according to the similarity principle of micro seismic data; performing DC component and whitening processing for packets of seismic data; using negative entropy as independence determination conditions of a micro seismic effective signal component and a micro seismic noise component, using the Newton iterative method for an optimization solution, and achieving the uncertainty separation of the components; and performing cross-correlation processing between the two components after uncertainty separation and original micro seismic data, and achieving the certainty separation of the micro seismic effective signal component from the micro seismic noise component through the magnitude and sign of a cross-correlation numerical value. The invention can be used for dramatically improving the signal to noise ratio of ground array type micro seismic data, achieving accurate identification of effective events in the micro seismic data, and improving the accuracy of micro seismic fracturing monitoring results.
Owner:CHINA PETROLEUM & CHEM CORP +1
Seismic gun assembly for shooting into a bore hole
InactiveUS8104568B2Avoid enteringImprove ventilationBreech mechanismsSeismic energy generationEngineeringCatheter
A seismic gun assembly comprising a barrel and guide tube assembly for delivering a projectile to the bottom of a bore hole with a non-line-of-sight section. The guide tube being either a large diameter guide tube or a tight fitted guide tube. The large diameter guide tube allowing the projectile to perform shallow angle bounces to reach the bottom of a non-line-of-sight bore hole. The tight fitted guide tube allows the projectile to ride the inner wall of the guide tube to reach the bottom of a non-line-of-sight bore hole. The projectile comprises an outer jacket and a frangible core. The seismic gun barrel assembly additionally comprises a fluid exclusion puck for preventing fluids from entering the guide tube, a suppressing collar for suppressing seismic noise, and a method for modulating recoil.
Owner:LUCHINI CHRIS
System, method and computer program product for stacking seismic noise data to analyze seismic events
Disclosed is a method for determining seismic event data from indications of seismic noise, the method including receiving seismic trace data from a plurality of locations, and providing a virtual trace value (ERvirtual) as seismic event data for a virtual trace location from the seismic trace data. A system and computer program product for determining seismic event data is also disclosed.
Owner:MAGNITUDE SPAS
Method to attenuate strong marine seismic noise
ActiveUS20120008458A1Digital computer detailsSeismic signal processingSingular value decompositionSeismic noise
Methods to attenuating strong marine seismic noises using singular value decomposition, determining noisiest traces and estimating noise components only from these traces, iteratively estimating the noise and protecting signal behind the noise. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).
Owner:WESTERNGECO LLC
Method for analyzing pre-stack time migration response of seismological observation system
ActiveCN104142518AIntuitive evaluationComprehensive evaluationSeismic signal processingSystems analysisObservation system
The invention relates to a method for analyzing the pre-stack time migration response of a seismological observation system. For the given seismological observation system, a geologic model and seismic noise parameters, a seismic record cannel is obtained through the forward modelling method obtained when a diffraction point travels aiming at each shot point-demodulator point pair in the seismological observation system, a noise recording channel is obtained through synthesis according to the noise parameters, a synthetic seismic record channel is obtained through superposition of the seismic record cannel and the noise recording channel, a pre-stack time migration result is obtained through Kirchhoff pre-stack time migration by the synthetic seismic record channel, superposition is conducted on the pre-stack time migration results of all the shot points-demodulator points in the seismological observation system to obtain the pre-stack time migration response of the seismological observation system, and the response is represented by a seismic cross-section graph to be used for evaluating the imaging effect of pre-stack time migration of the seismological observation system.
Owner:CHINA PETROLEUM & CHEM CORP +1
Apparatus and methods for attenuating seismic noise associated with atmospheric pressure fluctuations
Apparatus and methods are described for attenuating noise associated with atmospheric pressure fluctuations in a seismic signal during seismic data acquisition using at least a pair of sensors comprising a seismic sensor and a pressure sensor for concurrently receiving a seismic signal and a pressure signal respectively, the sensors being adapted individually to transmit the respective seismic and pressure signals to a remote recording station which is adapted to record a plurality of seismic and pressure signals; and a filter for removing, at least partly, noise associated with atmospheric pressure fluctuations in the seismic signal, the filter employing an input signal from the pressure sensor; and a model of the coupling between the atmosphere and the ground to generate a reference signal which is combined with the seismic signal to produce an output signal.
Owner:SCHLUMBERGER TECH CORP
Reflection coefficient inversion reservoir prediction method based on weighted stacking noise suppression strategy
ActiveCN107356965AReduce exploration riskStrong inversion noise immunitySeismic signal processingFrequency spectrumSeismic noise
The invention discloses a reflection coefficient inversion reservoir prediction method based on a weighted stacking noise suppression strategy. The method includes six main steps: 1), through a noise disturbance analysis, determining a source of noise influencing the inversion effect, and distinguishing seismic noise and inversion noise; 2) performing seismic noise suppression preprocessing on seismic data through a post-stack wavelet frequency division method; 3) for de-noised seismic data, constructing reflection coefficient inversion key parameters (a wavelet inverse transform factor F, an inversion predominant frequency band Q, and an inversion initial model S(n)); 4) suppressing inversion noise through weighted stacking of inversion results of multiple regularization parameters to obtain reflection coefficient inversion results; 5) performing quality control (QC) on the inversion results through spectrum analysis and a calibrated sound wave curve to obtain final result data; and 6) performing sand body fine interpretation based on the reflection coefficient result data, and predicting sand body spatial distribution characteristics. Compared with other thin reservoir prediction methods, according to the reflection coefficient inversion reservoir prediction method, the inversion anti-noise performance is high, thin-layer interference in the original seismic data can be eliminated, the prediction precision of the thin layer is greatly improved, and oil and gas exploration risks are reduced.
Owner:CHINA PETROLEUM & CHEM CORP +1
System and method for isolating signal in seismic data
Owner:CHEVROU USA INC
Composition (floor) slab of steel bar welding orthogonal net rack and concrete
InactiveCN102776973ATime-consuming and labor-intensive solutionIncrease stiffnessFloorsBuilding reinforcementsCrack resistanceEngineering
The invention discloses a composition (floor) slab of a steel bar welding orthogonal net rack and concrete, reinforcement is realized through welding a net rack 1 or a net rack 2 by using rebars, so that the property that the traditional reinforced concrete plate is zero in bearing force before setting of concrete is thoroughly changed, and thus cast-in-place operation of the (floor) slab disclosed by the invention does not require templates and supports. From the situation that reinforcement of the net rack has bearing force before concrete setting, various decorative plates, insulation plates and anti-seismic noise plates can be developed to serve as permanent templates; and due to the principle that bending a plane to a curved surface can increase the rigidity of the plane, the net rack 1 or the net rack 2 is bent into a net rack 3, and various decorative plates, insulation plates and fire-proof plates are fixed on the inner side of the bent net rack 3 by using hanging bars. Concrete with the strength larger than C30 is sprayed in a layering mode. The design and construction of a shell can be greatly expanded by using the composition (floor) slab. As the composition (floor) slab conforms to favorable conditions described by modern three mechanical theories, the bearing force of the composition (floor) slab is increased, and the crack resistance and aseismicity are strengthened due to the strengthening of ductility of the composition (floor) slab.
Owner:陈云波
Wireless communications method
InactiveUS20100146374A1Increase the areaReduce power consumptionCode conversionSeismologyCavitationMessage type
A Wireless communications protocol / method comprises: a. Sensors data size and structure are constant, and consist of several fields; b. The sensors message include one or more of the following: 1) a 8 to 16 bits long preamble of a start sequence, for example a binary 1010 . . . binary sequence 2) a sync sequence of for example 8 bits of a 11001100 sequence 3) a sensor's unique ID number of for example 8 to 16 bits 4) several bits of sensor's internal clock counter 5) several bits indicating the message type 6) data, for example 16 bits of data, and / or 7) CRC (for Cyclic Redundancy Check purposes), for example 8 to 16 bits. A method for detecting leakage from a pipe uses multiple channels / inputs, wherein a low frequency range input measures seismic noises, and a high frequency range input measures cavitation noises.
Owner:SAMUELSON JOSEF
Seismic noise suppression method based on unbalanced depth expectation block logarithm likelihood network
ActiveCN112598593AControl Denoising StrengthImprove denoising effectImage enhancementImage analysisPattern recognitionImaging processing
The invention discloses a seismic noise suppression method based on an unbalanced depth expectation block logarithm likelihood network, belongs to the technical field of machine learning and seismic image processing, and aims to solve the problem that strong noise cannot be suppressed thoroughly due to the fact that regular term parameters in an expectation block logarithm likelihood algorithm only change along with overall noise variance. The invention provides the seismic noise suppression method based on an unbalanced depth expected block logarithm likelihood network, and the end-to-end denoising network consists of an expected block log-likelihood denoising main network and an unbalanced multilayer perceptron parameter estimation network, and takes a noisy seismic image as an input end. The clean seismic image is used as an output-end learning network parameter. Futhermore the multilayer perception paramter estimation parameter with unbalanced block signal-to-noise ratio is firstlyadopted. According to the method, accurate regular term parameters can be estimated for each block in the seismic image, the denoising intensity of each block can be better controlled, the block denoising effect is improved. The method is superior to a traditional seismic denoising algorithm in the aspects of desert strong noise suppression and signal detail maintenance.
Owner:JILIN UNIV
Method, device and system for suppressing seismic noise
InactiveCN109917459AReduce complexityImprove signal-to-noise ratioSeismic signal processingSignal-to-noise ratio (imaging)Noise suppression
The embodiment of the invention discloses a method, device and system for suppressing seismic noise, and the method comprises the steps: carrying out the curvelet transformation processing of originalseismic data, and obtaining a curvelet coefficient; solving a gradient for the curvelet coefficient to obtain a local wave vector; carrying out first threshold processing on the size of the local wave vector to obtain a curvelet coefficient after threshold processing; and performing inverse curvelet transformation on the curvelet coefficient subjected to threshold processing to obtain seismic data after noise suppression. According to the embodiment of the invention, the method can achieve the more effective suppression of the seismic noise, and improves the signal-to-noise ratio of the seismic data.
Owner:PETROCHINA CO LTD
Method for detecting leakage from a pipe
InactiveUS20100139372A1Increase the areaDetection of fluid at leakage pointSeismologyCavitationVoltage variation
A method for detecting leakage from a pipe uses multiple channels / inputs, wherein a low frequency range input measures seismic noises, and a high frequency range input measures cavitation noises. A leakage indication is issued if both the low frequency and high frequency noises are simultaneously detected. A Sophisticated algorithm for processing sensors data in a four dimensional space includes location and time, includes a method for detecting an intruder's path in a location and time space. A method for detecting unauthorized access to oil, gas or other pipes, by monitoring the protective cathodic voltage and detecting changes in the voltage which are indicative of a technical failure or a deliberate attack on the pipe.
Owner:SAMUELSON JOSEF
System and method for filtering seismic noise data to analyze seismic events
InactiveUS7908086B2Seismic signal processingSpecial data processing applicationsData setComputer science
A method for filtering noise from seismic data is disclosed. The method includes: receiving at least one seismic data set; computing a value of at least one subset of a plurality of subsets of the at least one seismic data set; computing quartiles and an upper moustache (M) for the plurality of subsets; comparing the upper moustache (M) to the value of the at least one subset; and one of discarding and retaining the at least one subset as filtered seismic data. A system and computer program product for filtering noise from seismic data is also disclosed.
Owner:MAGNITUDE SPAS
High-temperature-resistant anti-knock sound-insulation plastic alloy composite material
InactiveCN107556603AHigh surface glossImprove the plating effectLinear low-density polyethyleneAlloy composite
The invention discloses a high-temperature-resistant and shock-resistant sound-insulating plastic alloy composite material, which belongs to the technical field of plastic alloys. Prepared from the following components by weight: 20-35 parts of linear low-density polyethylene, 15-35 parts of polypropylene, 15-35 parts of methyltriethoxysilane, 0.8-35 parts of ethylene-tetrafluoroethylene copolymer 2.5 parts, 2‑6 parts of calcium stearate, 5‑8 parts of epoxy soybean oil, 2‑3 parts of composite flame retardant, 2‑3 parts of ABS resin, 2‑6 parts of sodium hydroxide, 5 parts of crosslinking agent 9 parts, 1-3 parts of coupling agent, 5-9 parts of light calcium carbonate, 1-2 parts of stabilizer. The plastic alloy produced by the invention has good antibacterial and antifungal properties, high strength and strong aging resistance, excellent flame retardancy, high temperature resistance, high product strength, good impact strength, low cost, simple operation and corrosion resistance.
Owner:扬州市星海塑料制品有限公司
System, method and computer program product for stacking seismic noise data to analyze seismic events
Disclosed is a method for determining seismic event data from indications of seismic noise, the method including receiving seismic trace data from a plurality of locations, and providing a virtual trace value (ERvirtual) as seismic event data for a virtual trace location from the seismic trace data. A system and computer program product for determining seismic event data is also disclosed.
Owner:MAGNITUDE SPAS
System and Method for Filtering Seismic Noise Data to Analyze Seismic Events
InactiveUS20080162052A1Seismic signal processingSpecial data processing applicationsData setComputer science
A method for filtering noise from seismic data is disclosed. The method includes: receiving at least one seismic data set; computing a value of at least one subset of a plurality of subsets of the at least one seismic data set; computing quartiles and an upper moustache (M) for the plurality of subsets; comparing the upper moustache (M) to the value of the at least one subset; and one of discarding and retaining the at least one subset as filtered seismic data. A system and computer program product for filtering noise from seismic data is also disclosed.
Owner:MAGNITUDE SPAS
Automated in motion railway seismic wheel failure detection system
ActiveUS9969409B2Vibration measurement in solidsRegistering/indicating working of vehiclesPhase shiftedTrackway
Owner:VAN DER MERWE FRANK CARL
Seismic noise imaging exploration method and apparatus, and a storage medium
The embodiment of the invention discloses a seismic noise imaging exploration method and apparatus, and a storage medium. The method that is applied to an exploration system including a plurality of three-component low-frequency detectors that are arranged on one straight line at a preset interval comprises: acquiring a plurality of low-frequency three-component data including first data and two horizontal components and second data of a vertical component by the plurality of three-component low-frequency detectors; acquiring a measurement dispersion curve characterizing a correspondence relationship between a surface wave phase velocity and a frequency by using the plurality of the second data; acquiring a plurality of velocity models characterizing a correspondence relationship between the depth and velocity of the stratum of each measuring point according to the measurement dispersion curve and the plurality of low-frequency three-component data; and on the basis of the plurality ofvelocity models, determining a stratum velocity profile of the testing area based on the plurality of velocity models.
Owner:CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
Seismic noise imaging exploration method and apparatus, and storage medium
The embodiment of the invention discloses a seismic noise imaging exploration method and apparatus, and a storage medium. The method is applied to an exploration system including a three-component detector and a plurality of single-component detectors; and the plurality of single-component detectors are arranged on the circumference using the location of the three-component detector as the center.The method comprises: acquiring first data, including two horizontal component data and one vertical component data, of by the three-component detector; acquiring a plurality of second data characterizing a vertical direction by the plurality of single-component detectors; determining the velocity of a surface layer based on the plurality of second data and the vertical component data; and determining a velocity model that characterizes a correspondence relationship between the depth and velocity of the stratum according to the surface layer velocity and the first data; and determining a velocity profile of the testing area based on the velocity model.
Owner:CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
Safety protection type anti-seismic noise-reduction electromechanical engineering equipment for building construction
InactiveCN112706064AReduce harmImprove polishing accuracyGrinding carriagesPolishing machinesArchitectural engineeringMechanical engineering
The invention discloses safety protection type anti-seismic and noise-reducing electromechanical engineering equipment for building construction. The equipment comprises a box body; the box body is composed of sound insulation plates; a damping device is arranged at the bottom of the box body and comprises a first supporting plate; the bottom of the first supporting plate is fixedly connected with a damping rod; the bottom of the damping rod is fixedly connected with a second supporting plate; the second supporting plate is slidably connected with the side wall of a supporting base; the bottom of the second supporting plate is slidably connected with two sliding blocks; one sides of the two sliding blocks are fixedly connected with tooth blocks; tooth grooves meshed with the tooth blocks are formed in the inner wall of the supporting base; the two sliding blocks are connected through a fourth spring; and the bottoms of the sliding blocks are slidably connected with baffles. When the box body vibrates, the damping rods enable the second supporting plate to move downwards, when the tooth blocks and the tooth grooves are staggered, the two sliding blocks can move in the opposite directions to compress the fourth spring, so that vibration is well relieved in the process; and the baffles compress a damping spring, so that a good damping and buffering effect can be achieved.
Owner:TAIZHOU BUILDING INSTALLATION ENG
Method for detecting unauthorized access
InactiveUS20100141276A1Increase the areaHigh sensitivityResistance/reactance/impedenceSeismologyWireless communication protocolCavitation
A method for detecting unauthorized access to oil, gas or other pipes, by monitoring the protective cathodic voltage and detecting changes in the voltage which are indicative of a technical failure or a deliberate attack on the pipe. A method for detecting leakage from a pipe using multiple channels / inputs, wherein a low frequency range input measures seismic noises, and a high frequency range input measures cavitation noises, and wherein a leakage indication is issued if both the low frequency and high frequency noises are simultaneously detected. A low power consumption Wireless communications protocol is used.
Owner:SAMUELSON JOSEF
Algorithm for separating microseism noise mixed signal by utilizing SVD-EMD algorithm
PendingCN111709279AAffect local featuresPreserve local featuresCharacter and pattern recognitionComplex mathematical operationsSingular value decomposition methodEngineering
The invention discloses an algorithm for separating micro-seismic noise mixed signals by using an SVD-EMD algorithm. The algorithm comprises the following steps: (S1) preprocessing the micro-seismic noise mixed signals by using a singular value decomposition method SVD; (2) obtaining a signal f (x, t) subjected to SVD preprocessing, carrying out EMD decomposition on the signal, calculating currentstep signals f0 (x, t) of all extreme points by initializing a residual function res (x, t), and then removing an average envelope value from the original signal to enable the remaining part of signals f1 (x, t) to become signals of the next step; (S3) placing the current step signal f1 (x, t) and the previous step signal f0 (x, t) in a stop state, and repeating the screening process through an intrinsic mode function and a final remaining function; and (S4) utilizing Hilbert transform to obtain frequency characteristics of each intrinsic mode function decomposed through EMD, and calculatinga correlation coefficient Ri so as to complete signal reconstruction. By means of the scheme, the purposes of improving microseism seismic phase recognition and realizing the optimal P wave picking effect are achieved, and high practical value and promotional value are achieved.
Owner:TIANJIN CHENGJIAN UNIV +1
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