61 results about "Magnetotelluric sounding" patented technology

The present invention discloses a geologic body three-dimensional visualization method based on geophysical field data. Said method includes the following steps: (A), fetching collected geophysical field data, making fetched data be stored as object array, and statistically analyzing the fetched data so as to obtain space distribution characteristics of fetched data; (B), according to the space distribution characteristics of data combining data points in the object array and constructing them into concrete space polygonal mode; and (c), drawing and displaying said constructed space polygonal model, and making said space polygonal model undergo the process of visualization operation treatment.

This invention relates to earth physical exploring technique, which is of large earth electrical magnetic exploring data 3D resistance automatic imaging method, which comprises the following steps: using regular electrical magnetic exploring method to test and record area data; adopting the exploring two electrodes direction resistance rate and phase curve for insert value and induce with each image result as next reduce base near to aim object structure imaging.

The invention discloses a magnetic reference processing method for acquiring data in three dimensions through audio-frequency magnetotelluric sounding. The method can be used for acquiring high-quality electromagnetic field data. The method comprises the following steps: three-dimensional observation is conducted; observation points are distributed as a rectangular net on a rugged topography surface; a net observation density is defined according to an exploration proportional scale and the requirement of exploration depth; an electric channel is observed and a magnetic field component value is calculated at each observation point; the Cagniard resistivity corrected by the observation points is calculated by using the magnetic reference data. The magnetic reference processing method can be used for improving the working efficiency, independently collecting magnetic channels and electric channels and acquiring high-quality electromagnetic field data.

The invention provides a method for calculating the three-dimensional magnetotelluric sounding main impedance, and belongs to the field of electromagnetic exploration of geological exploration and underground mineral resource exploration such as petroleum, natural gas, and shale gas etc. The method includes: (1) acquiring time domain recording data obtained via field acquisition, wherein the data comprising an electric field and a magnetic field in the mutual vertical direction, namely ex (t), ey (t), hx (t), and hy (t), and t referring to time; (2) performing conversion of the time domain recording data in step (1) from time domain to frequency domain; (3) calculating the tensor impedance original value and performing editing processing of the original value; (4) calculating a correct coordinate rotation angle theta0; (5) calculating the main impedances a and b in the three-dimensional construction condition; (6) calculating three-dimensional scattering tensor factors e, lambda1, and lambda2; and (7) giving a calculating result of the coordinate rotation angle theta0, a three-dimensional scattering tensor factor C, and the main impedance Z0.

The present invention provides a geological data analysis and modeling method, comprising the following steps: ①Qualitative analysis: for the processed audio magnetotelluric sounding data, use two-dimensional deviation analysis, electrical main axis feature analysis, and polarization feature analysis respectively , Magnetic induction vector feature analysis and quasi-section map feature analysis are analyzed in at least three ways to obtain geological section data; ②AMT inversion: perform nonlinear conjugate gradient NLCG two-dimensional inversion on geological section data; ③Model establishment: according to the above According to the obtained data, according to the principle of continuous drilling, geological profile, lithology data and resistivity contour line, the section is electrically stratified. Combined to establish a geological and geophysical prospecting model. The beneficial effect of the invention is that: through qualitative analysis, AMT inversion and model building, a set of analytical methods with strong applicability, easy operation and system are provided for geological exploration of ore deposits.

The invention discloses a hidden polymetallic ore prospecting method. The method utilizes a rock debris geochemistry, a induced electric medium gradient scanning surface and a controllable source audio magnetotelluric sounding method to explore a hidden polymetallic ore bed controlled by a fracture structure, firstly selects a favorable polymetallic ore mining area according to a geological miningrule, and then utilizes the rock debris geochemistry measurement and defines a multi-element combined abnormal group; then, in the multi-element combined abnormal group area, an occurrence area of the polymetallic ore is defined by utilizing the induced electric medium gradient scanning surface; and finally, in the occurrence area of the polymetallic ore, the high-resistance mineralization and alteration zone is defined by utilizing the controllable source audio magnetotelluric sounding measurement. The hidden polymetallic ore prospecting method has the characteristics of accurate position identification of the blind deposit and obvious prospecting effect. By adopting the method, the prospecting breakthrough of the tin-silver-zinc-copper-lead polymetallic ore hidden under loose sedimentsis realized in the Baiyin Chagan Dongshan mining area of the Inner Mongolia Autonomous Region.

The invention provides a rare metal ore deposit prospecting method based on geological and geophysical technologies. Overlapped areas of structure intersection positions, mesozoic igneous rock bodies,high gravity value anomalies, and medium and high magnetic anomalies in province ranges are delineated as metallogenic prospect areas. Through combination of a rock geochemistry anomaly graph, metallogenic target areas of rare metal ore deposits are further delineated. An induced polarization method and high precision magnetic measurement are carried out in the target areas. Isolines of earth surface apparent resistivity and relative magnetic field values are drawn on a map. Overlapped areas of high apparent resistivity and high magnetic field values are delineated as metallogenic enriched sections. Audio magnetotelluric sounding and radon gas radioactive detection are carried out in the sections. Space distribution states of the ore deposits in the sections are delineated according to characteristics of high resistance, high gravity, high magnetic force and high radon gas. Suitable positions are selected for explosion of ore bodies. According to the method, through combination of thegeophysical technology, an ore body is precisely positioned, and a macroscopic to microscopic step-by-step prospecting ideal is embodied.

The invention belongs to the technical fields of uranium prospecting and geophysical exploration, particularly to an interlayer oxidation zone sandstone type uranium deposit favorable target area space location method. The interlayer oxidation zone sandstone type uranium deposit favorable target area space location method comprises the following steps of in key working areas, determining favorable metallogenic sections through telluric electromagnetic sounding; for the favorable metallogenic sections, outlining a redox transitional zone range through high-accuracy ground magnetic survey scanning; outlining the front line of a redox zone; primarily determining a favorable metallogenic area, performing electromagnetic measurement and fine sand body identification to outline target sand bodies in a longitudinal direction; according to the outlined redox transitional zone range and the longitudinal distribution of the target sand bodies, outlining a favorable metallogenic target area. The interlayer oxidation zone sandstone type uranium deposit favorable target area space location method solves the technical problem that the prior art cannot achieve accurate space location of uranium deposit, and by combining with the redox transitional zone range and the longitudinal distribution of the target sand bodies, can achieve accurate space location of interlayer oxidation zone sandstone type uranium deposit, thereby being significant sandstone type uranium deposit prospecting.

The invention provides a three-dimensional magnetotelluric tipper inversion method using nonlinear conjugate gradients and belongs to the technical field of magnetotelluric sounding. The method comprises steps as follows: S1, inputting data and performing ranking; S2, distributing the parameter of each frequency point to all cpus for tipper inversion and computing; S3, stopping parallel computing and combining the data, and comparing the difference between an invention result and the input date; S4, distributing the data difference and the parameter of each frequency point to all cpus for parallel computing of objective function gradients, computing the search direction p and the step length a and accordingly obtaining a model modification amount; S5, updating a module according to the model modification amount and stopping iteration when an objective function is one hour enough, otherwise, using a new model to repeat the steps from S2 to S5. According to the inversion method, tipper three-dimensional inversion is realized on the basis of tipper data by introducing a nonlinear conjugate gradient method, and the invention result approaches to real underground three-dimensional electrical structure information greatly; the method adopts a parallel computing structure, and the computing efficiency is improved.

The present invention discloses a sedimentary basin basement top surface form recovery and deep ore body location and prediction new method. The method comprises the following steps of: the step 1: atypical exploration line profile construction petrography catalog stage; the step 2: a typical exploration line profile voice frequency telluric electromagnetic sounding measurement stage; the step 3:on-surface developed area AMT profile measurement; and the step 4: a deep buried ore and rich and thick ore body location and prediction and key target area delineation stage. The sedimentary basin basement top surface form recovery and deep ore body location and prediction new method belongs to the technical field of mineral resource exploration. The method performs construction petrography catalog, voice frequency telluric electromagnetic sounding measurement and electrical resistivity parameter measurement of the typical exploration line profile system, a priori model formed by employing construction petrography catalog is employed to perform comparison and verification of voice frequency telluric electromagnetic sounding 1D and 2D inversion sections to determine an electrical structure surface between the basin basement structural layer and a cover layer and perform on-surface extension on this basis so as to accurately extract and recover the basin basement top surface form features.

The invention discloses a magneto-telluric field static displacement correcting method based on an inversion model, and belongs to the technical field of data processing of a telluric electromagnetic sounding method. The correcting method comprises the following steps that a high resistance body or a low resistance body with a shallow copy assigned to generalized static displacement electrical resistivity is added in a designed inversion initial model, in other words, the model grid electrical resistivity corresponding to a measurement point with static displacement is assigned to the generalized static displacement electrical resistivity to participate in inversion, accordingly, the static displacement of the measurement point is corrected, and the inversion result with the static displacement correction effect is obtained. The resistivity of the high resistance body is larger than that of the background, and the resistivity of the low resistance body is smaller than that of the background. According to the correcting method, the magneto-telluric field static displacement correcting is carried out on the basis of a three-dimensional theory, the corrected result is closer to the actual underground electrical structure, and information is more accurate. The static displacement correcting is achieved by designing the original model, the static correction implementing complexity is lowered, and zero-cost working is achieved.

The invention discloses a method and a device for estimating magnetotelluric parameters, and belongs to the technical field of magnetotelluric sounding. The method comprises the steps that electromagnetic field frequency domain signals of four components are acquired, wherein the four components include an x-direction electric field, a y-direction electric field, an x-direction magnetic field and a y-direction magnetic field, and the electromagnetic field frequency domain signal of each component comprises a plurality of electromagnetic field frequency domain signals; power spectra of the electromagnetic field frequency domain signals of the four components are determined, wherein the electromagnetic field frequency domain signal of the same component has a plurality of auto-power spectra, and the electromagnetic field frequency domain signals of the two same components have a plurality of cross-power spectra; an iterative initial value of impedance and an iterative initial value of admittance are determined by adopting a median filtering algorithm; iteration is performed for several times on the power spectra by adopting the iterative initial value of the impedance and the iterative initial value of the admittance; a mean of the power spectra and updated impedance and admittance are obtained; and the mean of the power spectra and the updated impedance and admittance are output as the magnetotelluric parameters. The method improves the estimation accuracy.

The invention covers the mining industry. Detection method of the occurrence zone of the mantle substance diapir finger consisting in that that geological observation are carried out in riftzones banked up by diapirs of the abnormal mantle and places of location of the mantle substance finger in the earth's crust are determined. Based on the presence of influence traces of silanes streams upon the rock and/or presence of separate ridges having the length up to 200 km by the width of up to 20 km and/or based on the blast traces of silanes and/or presence of scoria cones, differing by that that the correspondence of ³He/⁴He from gases sampled from sources of 10⁻⁵ order is additionally determined for determination of silicides at the small depth as physical parameters for the location of the mantle substance diapir finger in the earth's crust. The presence of high semiconductor conductivity, locality and activity of magnetic anomalies and anomalies of gravity field is additionally established. The occurrence depth of silicides is determined by magnetotelluric sounding and/or seismic reflection and refraction methods.

The invention discloses an active field compensation type digital ultralow frequency electromagnetic sensor, consisting of a sensor seal head, an SD card groove, a collection instrument cabin, a cushion block, an induction coil group, a sensor housing, a sensor shielding layer, and a magnetic core rod support. The invention utilizes a high performance CPU as a main controller, realizes the high accuracy data collection under a condition of low frequency and weak signal and stores the collected data into the SD card. The CPU starts up the active compensation system according to the real-time measurement temperature and vibration data in the data collection process, performs real-time automatic compensation on the collected signal, and effectively overcomes the affect on the test data due to the environment temperature and vibration. The invention has advantages of compensating the capability width and digitalized output.

The invention relates to a static effect correction method and system for magnetotelluric sounding. The correction method comprises the following steps: acquiring a magnetotelluric signal to be processed, wherein the magnetotelluric signal comprises five mutually orthogonal to-be-processed signals, and performing empirical mode decomposition on each to-be-processed signal to obtain a multi-order intrinsic mode function component corresponding to each to-be-processed signal; according to the multi-order intrinsic mode function component corresponding to each to-be-processed signal, determininga multi-order principal component of each to-be-processed signal by adopting a principal component analysis method; determining an effective signal component of each to-be-processed signal by adoptinga canonical correlation analysis method according to the multi-order principal components of all the to-be-processed signals; and reconstructing according to the effective signal component of each path of to-be-processed signal to obtain each path of corrected to-be-processed signal. According to the method, the static effect can be corrected, and the quality of the reconstructed signal is improved.

The invention provides a non-planar wave identification method and system for controllable source audio magnetotelluric sounding. The method comprises the following steps: performing forward modeling on a two-layer model and a four-layer model in a uniform half-space model to obtain CSAMT observation data; comparing the data curve observed by the CSAMT corresponding to each model with the data curve corresponding to the MT; determining the reaction of the CSAMT observed data curve corresponding to each model to the shallow stratum, and further determining the change form of the observed data along with the frequency; and identifying the non-plane wave according to the relationship between the change form of the observed data corresponding to each model along with the frequency and the response of the non-plane wave. According to the method, the transition region and the near region of the non-plane wave can be correctly identified and divided, and a correct inversion result is obtained.

The invention relates to a geochemical prospecting combination method for delineating a sandstone-type uranium ore-prospecting prospecting area in a coverage area, and the method comprises the following steps: carrying out the uranium ore geological survey and ground gamma total measurement in a basin-mountain coupling area, and knowing the uranium source condition of uranium mineralization in a basin and the evolution characteristics of a basin-mountain structure; performing comprehensive arrangement and research of data in the basin, and determining a possible uranium mineralization favorable area; performing controllable source audio magnetotelluric sounding, and determining the form and space distribution of a sand body beneficial to uranium mineralization; carrying out soil radon gasmeasurement and ground gamma total amount measurement in the uranium mineralization favorable sand body distribution area delineated in the step (3); comprehensively predicting the uranium mineralization prospective area; drilling follow-up verification. According to the method provided by the invention, uranium mineralization favorable areas can be rapidly screened, uranium-containing geologic bodies can be rapidly positioned, blindness of drilling construction is avoided, drilling work can be targeted, and therefore the progress of uranium ore exploration work is accelerated.

The invention relates to a telluric electromagnetic sounding data transmission and monitoring method based on Internet of Things and relates to the fields of Internet of Things, wireless transmission, intelligent terminal, database and data processing. In order to realize smooth data communication on the working site of the telluric electromagnetic sounding and especially under the condition of complex topography, severe environment and nonexistence of mobile phone signals, the invention provides a wireless networking technique suitable for telluric electromagnetic sounding working site and on the basis of Internet of Things and ZigBee, provides a wireless transmission protocol suitable for telluric electromagnetic sounding data transmission, provides a data processing and filtering algorithm and provides a database model suitable for management and automatic data organization of the data acquisition unit.

The invention provides a method and a device for data collection of controllable source audio-frequency magnetotelluric sounding. The method includes: receiving an electric field signal and a magnetic field signal transmitted by a transmitter and propagated through a terrestrial medium; based on the frequency of the electric field signal or a magnetic field signal and the frequency of the power frequency fundamental wave, obtaining a sampling rate and a sampling length; sampling the electric field signal by using the sampling rate and the sampling length to obtain electric field information, and sampling the magnetic field signal by using the sampling rate and the sampling length to obtain magnetic field information; and calculating an electrical structure of the terrestrial medium based on the electric field information and the magnetic field information, wherein the fundamental wave is an artificial power interference signal that affects electric field signal and the magnetic field signal. The invention also discloses a corresponding device for data collection of controllable source audio-frequency magnetotelluric sounding.

The invention relates to a magnetotelluric sounding signal reconstruction method and system. The method comprises the following steps of acquiring an initial magnetotelluric sounding signal; performing complementary ensemble empirical mode decomposition on the initial magnetotelluric sounding signal to obtain a plurality of mode component sequences; performing Hilbert transform on the plurality ofmodal component sequences to obtain an instantaneous frequency spectrum of each modal component sequence; screening a modal component sequence corresponding to the instantaneous frequency spectrum according to the distribution condition of the frequency points of the instantaneous frequency spectrum; and reconstructing all the reserved modal component sequences to obtain a reconstructed magnetotelluric sounding signal. The magnetotelluric sounding signal reconstruction method and system provided by the present invention solves a problem that a good denoising effect cannot be achieved for themagnetotelluric sounding signal of a dead band in the prior art.

The invention relates to the field of geological exploration, in particular to a deep heat storage well position target area exploration method and device, electronic equipment and a storage medium. The method comprises the steps of obtaining gravity data of a to-be-measured region; determining a buried hill zone and/or a raised area according to the gravity data, and taking the buried hill zone and/or the raised area as a preferred target area; determining a magnetotelluric signal of the preferable target region according to magnetotelluric sounding; and determining electrical data of the preferred target region according to the magnetotelluric signal. The method and the device have the effect of improving the well position selection efficiency.