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32 results about "Magnetotellurics" patented technology
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Magnetotellurics (MT) is an electromagnetic geophysical method for inferring the earth's subsurface electrical conductivity from measurements of natural geomagnetic and geoelectric field variation at the Earth's surface. Investigation depth ranges from 300 m below ground by recording higher frequencies down to 10,000 m or deeper with long-period soundings. Proposed in Japan in the 1940s, and France and the USSR during the early 1950s, MT is now an international academic discipline and is used in exploration surveys around the world. Commercial uses include hydrocarbon (oil and gas) exploration, geothermal exploration, carbon sequestration, mining exploration, as well as hydrocarbon and groundwater monitoring. Research applications include experimentation to further develop the MT technique, long-period deep crustal exploration, deep mantle probing, and earthquake precursor prediction research.
Electromagnetic surveying for hydrocarbon reservoirs
InactiveUS20060129322A1Reduce analysisEasy to separateElectric/magnetic detection for well-loggingPermeability/surface area analysisOcean bottomData set
An electromagnetic survey method for surveying an area of seafloor that is thought or known to contain a subterranean hydrocarbon reservoir, comprising obtaining a first survey data set with a vertical electric dipole (VED) antenna for generating vertical current loops and a second survey data set with a vertical magnetic dipole (VMD) antenna for generating horizontal current loops. In an alternative embodiment, the VMD antenna is dispensed with and the horizontal electromagnetic field is derived from the naturally occurring magnetotelluric (MT) electromagnetic field. In another alternative embodiment, the VED data is compared with a background geological model instead of VMD or MT data. The invention also relates to a survey apparatus comprising VED and VMD antennae, to planning a survey using this method, and to analysis of survey data taken using this survey method. The first and second survey data sets allow the galvanic contribution to the detector signals collected at a detector to he independently contrasted with the inductive effects. This is important to the success of using electromagnetic surveying for identifying hydrocarbon reserves and distinguishing them from other classes or structure.
Owner:OHM
Electromagnetic surveying for hydrocarbon reservoirs
InactiveUS7337064B2Reduce analysisEasy to separateElectric/magnetic detection for well-loggingPermeability/surface area analysisOcean bottomData set
An electromagnetic survey method for surveying an area of seafloor that is thought or known to contain a subterranean hydrocarbon reservoir, comprising obtaining a first survey data set with a vertical electric dipole (VED) antenna for generating vertical current loops and a second survey data set with a vertical magnetic dipole (VMD) antenna for generating horizontal current loops. In an alternative embodiment, the VMD antenna is dispensed with and the horizontal electromagnetic field is derived from the naturally occurring magnetotelluric (MT) electromagnetic field. In another alternative embodiment, the VED data is compared with a background geological model instead of VMD or MT data. The invention also relates to a survey apparatus comprising VED and VMD antennae, to planning a survey using this method, and to analysis of survey data taken using this survey method. The first and second survey data sets allow the galvanic contribution to the detector signals collected at a detector to he independently contrasted with the inductive effects. This is important to the success of using electromagnetic surveying for identifying hydrocarbon reserves and distinguishing them from other classes or structure.
Owner:OHM
Invention of inductive magnetic sensor used for superficial layer CSAMT (controlled source acoustic magnetotelluric) method
InactiveCN102147482AReduce volumeReduce noiseElectric/magnetic detectionAcoustic wave reradiationMagnetic currentLow noise
The invention relates to an inductive magnetic sensor used for a superficial layer CSAMT (controlled source acoustic magnetotelluric) method, which solves the problem of collection of magnetic field signals in a CSAMT observation method with working frequency of 10KHz to 100KHz. Multiple circles of enameled wire coils are wound on a long and thin magnetic core with high magnetic conductivity so as to induce the magnetic field signals to be tested and send inductive signals to a low noise amplifier for signaling, thereby obtaining voltage signals in an observable range. The whole sensor is realized in a magnetic current negative feedback mode. The magnetic current negative feedback feeds output signals back to an input in modes of a feedback resistor and a secondary coil so as to increase the working bandwidth of the coil and enhance temperature stability and mechanical stability of a system. The practice proves that the inductive magnetic sensor has the advantages of low noise, flat response functions and the like and is suitable for CSAMT engineering application.
Owner:朱万华
Magnetotelluric data acquisition system and method
ActiveCN104375191AReduce manufacturing costImprove data collection efficiencyElectric/magnetic detectionAcoustic wave reradiationData fileData acquisition
An embodiment of the invention provides a magnetotelluric data acquisition system comprising a data acquisition station and a broadband magnetic field sensor. The data acquisition station is capable of acquiring magnetotelluric data and high-frequency or audio magnetotelluric data in the same time; the broadband magnetic field sensor is capable of switching high and low frequencies. According to the magnetotelluric data acquisition system and method, three acquisition modes for different exploration purposes are provided. In the acquisition mode 1, high-frequency or audio magnetotelluric data is acquired; in the acquisition mode 2, at any observation point, low-frequency magnetotelluric data and high-frequency or audio magnetotelluric data are acquired in sequence, the low-frequency magnetotelluric data and the high-frequency or audio magnetotelluric data can be integrated in a broadband magnetotelluric data file; in the acquisition mode 3, the low-frequency magnetotelluric data is acquired. The magnetotelluric data acquisition system has such advantages that production cost is low, data acquisition efficiency is high, field production operations are simple and reliable, and few instruments or devices are used.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Field?audio magnetotelluric data acquisition method
ActiveCN103809204AReduce workloadGreat work efficiencyDetection using electromagnetic wavesElectrical resistance and conductanceHigh density
The invention belongs to the field of geophysical exploration and particularly relates to a field?audio magnetotelluric (AMT) data acquisition method. The method specifically comprises the following steps: (1) measuring lines?and?measuring point coordinates for area AMT acquisition are designed indoors; (2) measuring equipment is used for carrying out on-site positioning on the designed measuring lines?and?the measuring point coordinates and obstacles on the north-south measuring line are removed; (3) electrodes are laid; (4) a north-south horizontal magnetic?sensor Hx and an east-west horizontal magnetic?sensor Hy are laid in a central measuring point L4M4; (5) the potential ULiMj of each measuring point and the magnetic field in the center of a measuring net are measured; (6) the measuring net is moved and work in the whole measuring area is finished; (7) measured potentials of four points around the measuring point are used to calculate the electric field intensity; (8) tensor impedance, apparent resistivity, and phase data of each measuring point are calculated; and (9) tensor impedance and apparent resistivity of each measuring point are calculated to obtain homogenized high-density impedance, apparent resistivity and phase data.
Owner:BEIJING RES INST OF URANIUM GEOLOGY
Controlled source audio-frequency magnetotelluric (CSAMT) double-transmitting multi-receiving data acquiring system and CSAMT double-transmitting multi-receiving data acquiring method
InactiveCN101620277AGuaranteed safe operationMake sure not to interfere with each otherElectric/magnetic detectionAcoustic wave reradiationElectricityMeasuring instrument
The invention provides a controlled source audio-frequency magnetotelluric (CSAMT) double-transmitting multi-receiving data acquiring system which comprises transmitting systems and a signal receiving system, wherein each transmitting system comprises two sets of transmitters and generators connected with the transmitters, power supply poles at both ends of a transmitting electric dipole are connected with the two transmitters by a switch, and two sets of transmitting systems share one transmitting electric dipole; the signal receiving system comprises more than three data collecting groups, each data collecting group comprises a multifunctional electric measuring instrument V8 receiving host machine and an electric field signal data collecting instrument RXU3E matched with the multifunctional electric measuring instrument V8 receiving host machine, and all receiving groups are generally arranged along a measuring line. The invention also provides a CSAMT double-transmitting multi-receiving data acquiring method which comprises the following steps of preparing and demarcating equipment, arranging receiving points, transmitting by power supply, receiving and transmitting by switch. The invention realizes the continuous transmission all day, shortens the investigation time and improves the working efficiency in such a way that two sets of transmitting systems share one transmitting electric dipole to alternately transmit.
Owner:甘肃铁道综合工程勘察院有限公司
A denoising method of magnetotelluric signal based on noise discrimination
ActiveCN109101910AAvoid filteringImprove classification accuracyCharacter and pattern recognitionData segmentDecomposition
The invention discloses a magnetotelluric signal denoising method based on noise discrimination, which comprises the following steps: calculating approximate entropy and LZ complexity of each electromagnetic signal sample; using the approximate entropy, LZ complexity and class value of each electromagnetic signal sample to train the preset classification model to get the noise discrimination classification model; acquiring magnetotelluric signals to be processed, and performing noise screening on the magnetotelluric signals to be processed according to the noise screening classification modelto obtain electromagnetic signal segments with non-strong interference and electromagnetic signal segments with strong interference; combining the empirical mode decomposition of complementary set andwavelet threshold method, the strong disturbance electromagnetic signal being suppressed; the reconstructed magnetotelluric signal being obtained by combining the de-noising suppressed electromagnetic signal with the non-strong disturbance electromagnetic signal. The method of the invention can more accurately discriminate the data segments with strong interference and non-strong noise interference, retain the real magnetotelluric signal, and improve the denoising effect of the magnetotelluric signal.
Owner:HUNAN NORMAL UNIVERSITY
Method and apparatus for obtaining controllable source audio-frequency magnetotelluric (CSAMT) apparent phase information
InactiveCN105911595AElectric/magnetic detectionAcoustic wave reradiationPotential differenceMagnetotellurics
The invention brings forward a method and apparatus for obtaining controllable source audio magnetotelluric (CSAMT) apparent phase information, and relates to the field of coalfield hydrogeology and geophysics. The method comprises the following steps: obtaining CSAMT electric field component potential difference data; through the potential difference data, obtaining apparent resistivity data; and according to the apparent resistivity data, calculating apparent phase data by use of a ratio. According to the invention, restrictions of a "remote area" are removed, under the condition of lack of magnetic field data, the apparent phase information is obtained by use of electric field single component data, and thus an important reference basis is provided for CSAMT data interpretation.
Owner:INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
Near-field correction method of apparent resistivity of controlled source audio-frequency magnetotelluric method
ActiveCN108169800AElectric/magnetic detectionAcoustic wave reradiationCorrection methodElectric field
The invention, which belongs to the field of electromagnetic method data processing of the artificial field source frequency domain for geophysical exploration, discloses a near-field correction method of the apparent resistivity of a controlled source audio-frequency magnetotelluric method. The method comprises: step A, transforming current data, electric field data, and magnetic field data in atime domain into frequency domain data by using Fourier transformation; step B, according to electric field data and magnetic field data in the frequency domain data, carrying out calculation to obtain a Cagniard apparent resistivity and a phase; and step C, determining whether a near-field effect exists based on the Cagniard apparent resistivity and phase features; and if so, acquiring a correction parameter based on ratio of normalized theoretical electric field data to electric field data after current normalization. Therefore, morphological distortion of an apparent resistivity curve is corrected and a low-frequency data form is restored; and thus the data of the source-detectable audio-frequency magnetotelluric method can be applied to the data inversion to the great extent, so that more underground electrical structure information is obtained.
Owner:江苏省有色金属华东地质勘查局地球化学勘查与海洋地质调查研究院
Magnetotelluric meshless numerical simulation method for random conductive medium model
InactiveCN105354421AEasy loadingFacilitate understanding of the laws of communicationInformaticsSpecial data processing applicationsCorrelation functionLU decomposition
The present invention proposes a magnetotelluric meshless numerical simulation method for a random conductive medium model. The method is for heterogeneity of underground space, and according to the method, a shape function is constructed based on discrete nodes, and dependence on a mesh no longer exists. The method provided by the present invention comprises: using the spectral decomposition theory and the hybrid autocorrelation function theory of the stochastic modeling process to construct a random conductive medium model of underground space; establishing a function of the magnetotelluric corresponding boundary value problem; establishing a shape function of a meshless method by using a least squares method; using the Lagrange multipliers method to load essential boundary conditions; resolving linear equations by using the biconjugate gradient stabilized (BICGSTAB) algorithm of incomplete LU decomposition preprocessing, to obtain a field value of each node in the region; and using the field values to calculate the apparent resistivity and phase of each point, thereby completing the whole numerical simulation calculation process. The section calculated according to values of the random conductive medium model better complies with the actual situation, and is more advantageous for the interpretation and processing work of the magnetotelluric data.
Owner:JILIN UNIV
A controlled source audio-frequency magnetotellurics one-dimensional inversion method using an improved genetic algorithm
InactiveCN106021859AImprove robustnessImprove performanceInformaticsSpecial data processing applicationsProbitInversion methods
The invention provides a controlled source audio-frequency magnetotellurics one-dimensional inversion method using an improved genetic algorithm. By applying the genetic algorithm to CSAMT one-dimensional data inversion, a target function based on the combination of frequency weighting and phase weighting is proposed, a selection operator based on the combination of fitness value ranking selection and the simulated annealing method is proposed, segmented crossover probability upper and lower limits are proposed, and a crossover operator based on the combination of the self-adaptive crossover probability based on fitness values and a mutation operator based on the combination of fitness and gene weighting are proposed; by using the probability-based optimal individual preservation strategy, the individual with the smallest fitness value is replaced by the individual with the largest fitness value with a certain probability. Compared with the conventional CSAMT data inversion method, the method prevents inversion failure caused by the emergence of ill-conditioned matrixes, can avoid the problems of prematurity and the condition of being liable to be caught in a local extremum in the standard genetic algorithm, and enables chromosomes to move in the optimal solution direction rapidly to find the optimal solution.
Owner:JILIN UNIV
High-precision magnetotelluric forward modeling method
InactiveCN109977585AImprove the accuracy of forward modelingImprove efficiencyDesign optimisation/simulationSpecial data processing applicationsModel methodAlgebraic equation
The invention provides a high-precision magnetotelluric forward modeling method, which comprises the following steps of establishing a geophysical model, and dividing a geoelectric model by adopting Chebyshev points; establishing a Chebyshev derivation matrix; utilizing the Chebyshev derivation matrix to convert a partial differential equation of the magnetotelluric forward modeling calculation into an algebraic equation; carrying out the boundary condition processing; solving a large asymmetric dense complex coefficient linear equation set; carrying out the magnetotelluric response calculation. In order to improve the forward modeling calculation precision of the magnetotelluric response, the invention provides the magnetotelluric forward modeling method with high precision, high adaptability and high efficiency. According to the method, the magnetotelluric high-precision forward modeling can be performed, so that the magnetotelluric inversion calculation efficiency can be greatly improved, and the method has the important practical significance for promoting the popularization and application of the magnetotelluric method in the deep resource exploration field.
Owner:CENT SOUTH UNIV
Static correction method of CSAMT data
InactiveCN109470135AIntuitively reflect the correction situationReflect the correctionElectric/magnetic depth measurementMagnetotelluricsOriginal data
The invention relates to a static correction method of CSAMT data. The method comprises the following steps of fitting a controllable source audio magnetotelluric original signal according to apparentresistivity data of controllable source audio magnetotelluric discrete points and performing empirical mode decomposition on each IMF component; identifying a static effect according to a correlationcoefficient between the apparent resistivity values of all frequency points of observation points and reference points, and if the static effect exists, reconstructing the original signal according to each IMF component to obtain a statically corrected controllable source audio frequency magnetotelluric reconstruction signal s'(t). The method can keep the information of an abnormal body in the original data during suppression of the static effect, so that the abnormal body is not distorted.
Owner:JILIN UNIV
Controllable-source high-frequency magnetotelluric instrument system and measuring method
PendingCN109490968AAccurate detectionReduce detection blind spotsElectric/magnetic detectionAcoustic wave reradiationMagnetotelluricsSurface construction
The invention discloses a controllable-source high-frequency magnetotelluric instrument system. The controllable-source high-frequency magnetotelluric instrument system comprises an emitting terminaland a receiving terminal, the receiving terminal is arranged in the emitting-electrode midperpendicular electromagnetic field measuring range of the emitting terminal and in a region with the receiving-emitting distance of 1.5 Km to 3 Km; the emitting-electrode midperpendicular electromagnetic field measuring range is a 60-degree sector range with the emitting-electrode midperpendicular as the central horizontal line; the invention also discloses a controllable-source high-frequency magnetotelluric instrument method. By means of the controllable-source high-frequency magnetotelluric instrumentsystem, earth's surface constructions within 500 m can be efficiently and accurately measured, and a detecting dead zone is reduced.
Owner:国科(重庆)仪器有限公司
Time-shift controlled source audio-frequency magnetotellurics detection method applied to coalbed methane development process
InactiveCN108227006AGood geological effectPlay a role in promotingElectric/magnetic detectionAcoustic wave reradiationMeasurement pointData treatment
The invention relates to a time-shift controlled source audio-frequency magnetotellurics detection method applied to a coalbed methane development process. According to the method, a plurality of actual measurement point apparent resistivity curves are repeatedly acquired a plurality of times for the same target region or test region according to a certain time interval and a "six-identical requirement" with the same observation method adopted before and during the coalbed methane development of the target region, wherein the six-identical requirement is explained in the descriptions of the invention; and the above data are processed, so that an along-coalbed differential apparent resistivity data body is obtained, and coal reservoir water system dynamic change during a coalbed methane well draining and mining process and a range influenced by the coalbed methane development process can be obtained, and coalbed methane development can be quantitatively monitored. The method has been applied to the coalbed methane development of some regions in the Zhijin County of the Guizhou Province and the southern region of the Yanchuan County with successful experience achieved.
Owner:CHINA PETROLEUM & CHEM CORP
Advanced geological forecasting method and device and storage medium
InactiveCN110320576AAvoid false positivesEasy to identifyGeological measurementsMagnetotelluricsBusiness forecasting
Owner:CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP +1
Apparatus for airborne geophysical prospecting using both natural and controlled source fields and method
ActiveUS20160231449A1Electric/magnetic detection for transportAcoustic wave reradiationMagnetotelluricsEngineering
A composite electromagnetic (EM) system and method for measuring naturally occurring magnetic fields and controlled magnetic fields. The composite EM system includes a housing, an audio-magnetotelluric (AMT) system attached to the housing and measuring natural magnetic fields generated by earth, a frequency-domain EM (FDEM) system attached to the housing and measuring controlled magnetic fields generated by a controlled source, and a position and orientation (POS) system attached to the housing and configured to calculate an orientation and a position of the AMT system and housing relative to the earth. The housing is configured to be attached to an aircraft for being airborne while measuring the natural magnetic fields and the controlled magnetic fields.
Owner:CGG SERVICES SA
Low-frequency magnetotelluric signal denoising method based on shift invariant sparse coding
ActiveCN110147766AAvoid lostAccurate removalCharacter and pattern recognitionWater resource assessmentPattern recognitionMagnetotellurics
The invention provides a low-frequency geomagnetic signal denoising method based on shift-invariant sparse coding. The method comprises the following steps: firstly, decomposing a noise-containing magnetotelluric time sequence into a low-frequency effective signal and a noise-containing high-frequency signal by using mathematical morphology filtering; and then dividing the high-frequency signal containing noise into a plurality of segments, autonomously learning a feature structure of human noise from the high-frequency signal containing noise by using shift invariant sparse coding to construct a learning type redundant dictionary, and performing signal-noise separation on the high-frequency effective signal containing noise by using the learned redundant dictionary to obtain a denoised high-frequency effective signal; and adding the low-frequency effective signal and the high-frequency effective signal to obtain a full-band magnetotelluric effective signal. Strong human noise in low-frequency magnetotelluric data can be effectively removed, the quality of the magnetotelluric data is remarkably improved, and the deep detection effect of a magnetotelluric method is improved.
Owner:EAST CHINA UNIV OF TECH
Magnetotelluric three-dimensional forward modeling method based on spherical coordinate system
ActiveCN110068873AAvoid Calculation BiasImprove matchElectric/magnetic detectionAcoustic wave reradiationCalculation errorPrism
The invention discloses a magnetotelluric three-dimensional forward modeling method based on a spherical coordinate system, and belongs to the technical field of geophysical exploration. The method comprises the following steps: a, establishing a magnetotelluric control equation; b, dividing the spherical coordinate system into a plurality of small inverted quadrangular prism grid units; c, setting spherical coordinate model parameters, and constructing a spherical coordinate staggered grid unit with a discrete magnetic field; d, cycling a single frequency, and performing numerical dispersionon the magnetotelluric control equation in the spherical coordinate staggered grid unit; e, solving a system of linear equations; and f, calculating impedance via a spherical coordinate tensor impedance formula, and then substituting the impedance into a Kania apparent resistivity calculation formula to figure out the apparent resistivity and phase at a measuring point. By adoption of the magnetotelluric three-dimensional forward modeling method disclosed by the invention, the interference of the earth curvature on the magnetotelluric three-dimensional deep detection can be effectively overcome, calculation errors caused by the earth curvature are avoided, the magnetotelluric three-dimensional forward modeling method is suitable for the numerical simulation of magnetotelluric three-dimensional forward modeling, and can be better matched with an earth model, and the accuracy is high.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY
Intelligent broadband long-period magnetotelluric measurement system
ActiveCN106772627AGuaranteed unidirectional conductivityWith unidirectional conductivityElectric/magnetic detectionAcoustic wave reradiationLow noiseElectric field
The invention discloses an intelligent broadband long-period magnetotelluric measurement system comprising a data recorder. The data recorder is connected with an electrode, a three-axis inductive magnetic sensor and a three-axis flux gate sensor through cables. The electrode is a non-polarizable electrode, and is used for observing electric field signals. The three-axis inductive magnetic sensor is composed of three magnetic sensors which are arranged in the due north, due east and vertically-down directions respectively and are used for observing three-component high-frequency magnetic field signals. The flux gate sensor is integrated with a three-axis coil and is used for observing three-component low-frequency magnetic field signals. The data recorder collects and stores the voltage output signals of the electrode, the three-axis inductive magnetic sensor and the three-axis flux gate sensor at high precision. The data recorder is equipped with multiple groups of lead-acid batteries and is connected with a solar panel. The multiple groups of lead-acid batteries are connected in parallel to power the data recorder. The solar panel charges the multiple groups of lead-acid batteries. The system is built to satisfy the demand for building a long-period magnetotelluric observation station, and has the characteristics of wide frequency, low noise, low power consumption, and intelligence.
Owner:北京优赛寰宇科技有限公司
Determination system containing magnetosphere-shaped dielectric electromagnetic response
InactiveCN106054257AMaster ResponsivenessElectric/magnetic detectionAcoustic wave reradiationMagnetotelluricsMagnetic anomaly
The present invention discloses a determination system containing magnetosphere-shaped dielectric electromagnetic response. The system comprises an electromagnetic response analyzing module and an electromagnetic response numerical value calculation module, and has the positive theoretical and practical significance for identifying a magnetic anomaly effect in the field actual measurement controlled source audiofrequency magnetotelluric (CASMT) data and improving the data explanation precision.
Owner:INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
Distribution type multi-parameter deep electromagnetic section imaging system and measuring method thereof
InactiveCN102012525BEnabling Excited Polarization MeasurementsImprove test accuracyElectric/magnetic detectionAcoustic wave reradiationNetwork connectionData acquisition
Owner:JILIN UNIV
Apparatus for airborne geophysical prospecting using both natural and controlled source fields and method
ActiveUS10393910B2Acoustic wave reradiationElectric/magnetic detection for transportMagnetotelluricsEngineering
A composite electromagnetic (EM) system and method for measuring naturally occurring magnetic fields and controlled magnetic fields. The composite EM system includes a housing, an audio-magnetotelluric (AMT) system attached to the housing and measuring natural magnetic fields generated by earth, a frequency-domain EM (FDEM) system attached to the housing and measuring controlled magnetic fields generated by a controlled source, and a position and orientation (POS) system attached to the housing and configured to calculate an orientation and a position of the AMT system and housing relative to the earth. The housing is configured to be attached to an aircraft for being airborne while measuring the natural magnetic fields and the controlled magnetic fields.
Owner:CGG SERVICES SA
A field audio magnetotelluric data acquisition method
ActiveCN103809204BReduce workloadGreat work efficiencyDetection using electromagnetic wavesData acquisitionInterior design
The invention belongs to the field of geophysical exploration and particularly relates to a field?audio magnetotelluric (AMT) data acquisition method. The method specifically comprises the following steps: (1) measuring lines?and?measuring point coordinates for area AMT acquisition are designed indoors; (2) measuring equipment is used for carrying out on-site positioning on the designed measuring lines?and?the measuring point coordinates and obstacles on the north-south measuring line are removed; (3) electrodes are laid; (4) a north-south horizontal magnetic?sensor Hx and an east-west horizontal magnetic?sensor Hy are laid in a central measuring point L4M4; (5) the potential ULiMj of each measuring point and the magnetic field in the center of a measuring net are measured; (6) the measuring net is moved and work in the whole measuring area is finished; (7) measured potentials of four points around the measuring point are used to calculate the electric field intensity; (8) tensor impedance, apparent resistivity, and phase data of each measuring point are calculated; and (9) tensor impedance and apparent resistivity of each measuring point are calculated to obtain homogenized high-density impedance, apparent resistivity and phase data.
Owner:BEIJING RES INST OF URANIUM GEOLOGY
Controlled source audio frequency magnetotelluric one-dimensional inversion method based on improved genetic algorithm
InactiveCN106021859BImprove robustnessImprove performanceInformaticsSpecial data processing applicationsProbitInversion methods
The invention provides a controlled source audio-frequency magnetotellurics one-dimensional inversion method using an improved genetic algorithm. By applying the genetic algorithm to CSAMT one-dimensional data inversion, a target function based on the combination of frequency weighting and phase weighting is proposed, a selection operator based on the combination of fitness value ranking selection and the simulated annealing method is proposed, segmented crossover probability upper and lower limits are proposed, and a crossover operator based on the combination of the self-adaptive crossover probability based on fitness values and a mutation operator based on the combination of fitness and gene weighting are proposed; by using the probability-based optimal individual preservation strategy, the individual with the smallest fitness value is replaced by the individual with the largest fitness value with a certain probability. Compared with the conventional CSAMT data inversion method, the method prevents inversion failure caused by the emergence of ill-conditioned matrixes, can avoid the problems of prematurity and the condition of being liable to be caught in a local extremum in the standard genetic algorithm, and enables chromosomes to move in the optimal solution direction rapidly to find the optimal solution.
Owner:JILIN UNIV
A magnetotelluric data acquisition system and its acquisition method
ActiveCN104375191BReduce manufacturing costImprove data collection efficiencyElectric/magnetic detectionAcoustic wave reradiationCollection systemData acquisition
The magnetotelluric data collection system of the embodiment of the present invention includes a data collection station capable of simultaneously collecting low-frequency magnetotelluric data and high-frequency or audio frequency magnetotelluric data and a broadband magnetic field sensor capable of switching between high and low frequencies. The magnetotelluric data acquisition system and its acquisition method of the present invention have three acquisition modes for different exploration purposes. Collection method 1 collects high-frequency or audio magnetotelluric data; when it is set to collection method 2, at any observation point, low-frequency magnetotelluric data and high-frequency or audio magnetotelluric data can be collected sequentially, and low-frequency magnetotelluric data can be collected Combined with high-frequency or audio magnetotelluric data in a broadband magnetotelluric data file; acquisition method 3 collects low-frequency magnetotelluric data. The collection system of the present invention has the advantages of low production cost, high data collection efficiency, simple and reliable field production operation, less instruments and equipment used, and the like.
Owner:BC P INC CHINA NAT PETROLEUM CORP +1
Near-field correction method for apparent resistivity of controlled source audio magnetotelluric method
ActiveCN108169800BElectric/magnetic detectionAcoustic wave reradiationCorrection methodElectric field
The invention, which belongs to the field of electromagnetic method data processing of the artificial field source frequency domain for geophysical exploration, discloses a near-field correction method of the apparent resistivity of a controlled source audio-frequency magnetotelluric method. The method comprises: step A, transforming current data, electric field data, and magnetic field data in atime domain into frequency domain data by using Fourier transformation; step B, according to electric field data and magnetic field data in the frequency domain data, carrying out calculation to obtain a Cagniard apparent resistivity and a phase; and step C, determining whether a near-field effect exists based on the Cagniard apparent resistivity and phase features; and if so, acquiring a correction parameter based on ratio of normalized theoretical electric field data to electric field data after current normalization. Therefore, morphological distortion of an apparent resistivity curve is corrected and a low-frequency data form is restored; and thus the data of the source-detectable audio-frequency magnetotelluric method can be applied to the data inversion to the great extent, so that more underground electrical structure information is obtained.
Owner:江苏省有色金属华东地质勘查局地球化学勘查与海洋地质调查研究院
Method of quickly contouring multi-metal mineralization position
InactiveCN103901480AStrong Attack Deep AbilityQuick CircleElectric/magnetic detectionAcoustic wave reradiationMagnetotelluricsGeophysical Processes
The invention belongs to the technical field of applied geophysics of the field of geological mineral exploration, and particularly relates to a method of quickly contouring a multi-metal mineralization position. The method comprises the following steps of laying a geophysical induced polarization intermediate gradient surface scanning survey network in an exploration area, carrying out induced polarization intermediate gradient survey on the laid geophysical induced polarization intermediate gradient surface scanning survey network, laying an audio magnetotelluric survey network to find out underground electric difference at the abnormal induced polarization position according to the abnormal induced polarization form, carrying out survey on each survey line of the audio magnetotelluric survey network, carrying out inversion on data of the audio magnetotelluric survey and ensuring the inversion result to be consistent, drawing a geoelectric section diagram of the corresponding survey line, determining geoelectric characteristics at the abnormal induced polarization position according to the geoelectric section diagram of each survey line of the audio magnetotelluric survey network, and determining the electric transition zone and the electric change zone below the abnormal induced polarization position to be the possible mineralization position according to the geoelectric characteristics acquired by the audio magnetotelluric engineering.
Owner:BEIJING RES INST OF URANIUM GEOLOGY
A denoising method for magnetotelluric signal based on noise discrimination
ActiveCN109101910BAvoid blindnessHigh precisionCharacter and pattern recognitionData segmentDecomposition
The invention discloses a method for denoising magnetotelluric signals based on noise discrimination, which includes: calculating the approximate entropy and LZ complexity of each electromagnetic signal sample; using the approximate entropy, LZ complexity and category value training of each electromagnetic signal sample The preset classification model is used to obtain the noise discrimination classification model; the magnetotelluric signal to be processed is obtained, and then the noise discrimination is performed on the magnetotelluric signal to be processed according to the noise discrimination classification model to obtain the electromagnetic signal segment of non-strong interference and the electromagnetic signal segment of strong interference; The electromagnetic signal segment with strong interference is combined with complementary set empirical mode decomposition and wavelet threshold method for noise suppression processing; the electromagnetic signal segment after denoising suppression processing is merged with the electromagnetic signal segment without strong interference to obtain the reconstructed magnetotelluric signal. The present invention can more accurately discriminate strong interference and non-strong noise interference data segments through the above method, retain the real magnetotelluric signal, and improve the denoising effect of the magnetotelluric signal.
Owner:HUNAN NORMAL UNIVERSITY
Broadband intelligent long-period magnetotelluric measurement system
ActiveCN106772627BRealize magnetic field signal observationNoise power increaseElectric/magnetic detectionAcoustic wave reradiationLow noiseElectric field
The invention discloses an intelligent broadband long-period magnetotelluric measurement system comprising a data recorder. The data recorder is connected with an electrode, a three-axis inductive magnetic sensor and a three-axis flux gate sensor through cables. The electrode is a non-polarizable electrode, and is used for observing electric field signals. The three-axis inductive magnetic sensor is composed of three magnetic sensors which are arranged in the due north, due east and vertically-down directions respectively and are used for observing three-component high-frequency magnetic field signals. The flux gate sensor is integrated with a three-axis coil and is used for observing three-component low-frequency magnetic field signals. The data recorder collects and stores the voltage output signals of the electrode, the three-axis inductive magnetic sensor and the three-axis flux gate sensor at high precision. The data recorder is equipped with multiple groups of lead-acid batteries and is connected with a solar panel. The multiple groups of lead-acid batteries are connected in parallel to power the data recorder. The solar panel charges the multiple groups of lead-acid batteries. The system is built to satisfy the demand for building a long-period magnetotelluric observation station, and has the characteristics of wide frequency, low noise, low power consumption, and intelligence.
Owner:北京优赛寰宇科技有限公司
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