42results about How to "Improve exploration accuracy" patented technology

The invention discloses a method for identifying natural gas hydrate (NGH) by using the incremental ratio between the wave impedance of longitudinal and traverse waves. The method comprises the following steps: (1) inverting the longitudinal wave impedance ZP=VP rho of strata and the transverse wave impedance ZS=VS rho of strata by using seismic data; (2) obtaining the longitudinal wave impedanceZP0 and the transverse wave impedance ZS0 of water-saturated strata; (3) obtaining the longitudinal wave impedance increments delta ZP=ZP-ZP0 and the transverse wave impedance increments delta ZS= ZS-ZS0; (4) obtaining the incremental ratio Ratio of the wave impedance of longitudinal and traverse waves; (5) inverting the porosity of strata; (6) determining the threshold value of the incremental ratio of the wave impedance of longitudinal and traverse waves according to the porosity; (7) judging whether the incremental ratio Ratio of the wave impedance of longitudinal and traverse waves is higher than the threshold value, if so, indicating that the strata contain the NGH; and (8) drawing the bisect where the incremental ratio of the wave impedance of longitudinal and traverse waves is higher than that of the threshold value, wherein the bisect can reflect the distribution range of underground NGH. The method of the invention improves the reliability of the identification results of NGH,greatly improves the exploration precision of NGH and reduces the dry-well rate.

The invention discloses a remote reference magnetotelluric impedance calculation method based on correlation detection, and belongs to the field of geophysical exploration, for overcoming the disadvantage of low accuracy of conventional magnetotelluric tensor impedance calculation. The method comprises the following steps: electric fields and magnetic fields of a base station and a reference station are respectively acquired, processed and obtained, electromagnetic field coherence degrees of the base station and the reference station are respectively calculated, when the two electromagnetic field coherence degrees are greater than a certain threshold, data segments are reserved and marked, and data segments, free from non-relevant noise interference, of the base station and the reference station are obtained; and then, magnetic field component coherence degrees of the base station and the reference station with the marked data segments are calculated, when the magnetic field component coherence degrees are greater than a certain threshold, data segments, free from noise interference, of these magnetic fields are reserved, otherwise, the data segments are abandoned, participation in subsequent tensor impedance estimation is canceled, tensor impedance estimation is carried out by use of a conventional remote reference magnetotelluric mode based on a Robust method, and apparent resistivity and impedance phase values are calculated by use of tensor estimated values. The method provided by the invention is applied to magnetotelluric exploration.

A device for detecting a parking space of a smart parking assistant system (SPAS) is disclosed. A device for detecting a parking space includes: a signal pre-processing unit configured to filter reflection signals which are ultrasonic signals reflected and returned from a corner section of an obstacle, the ultrasonic signals being emitted from ultrasonic sensors attached to a vehicle; a pattern-based corner estimating unit configured to extract a crossing point of a plurality of circles having a plurality of measurement distances, which are collected from the reflection signals according to a movement of the vehicle as radiuses, estimate a reflection angle between a first line for bisecting a detection region within the detection region of the ultrasonic sensor, which has an attachment position of the ultrasonic sensor as a reference point, and a second line for connecting the reference point and the crossing point, and estimate the corner section of the obstacle based on the estimated reflection angle; and a parking space detecting unit configured to detect a parking space of the vehicle according to the estimated corner section.

The invention provides a three-dimensional high-precision bin fractionation processing and evaluation technology for seismic data, and the method comprises the following steps: analyzing original data, and carrying out trace header modification, grid definition and linear normal moveout correction on data acquired by an observation system, thus acquiring a prestack multi-domain composite denoised image; based on the relationship between bin fractionation and the signal-to-noise ratio as well as the relationship between bin fractionation and the multiplicity during forward modeling, comprehensively compensating for the vibration amplitude, thus acquiring a tomographic inversion refracted wave static correction image; analyzing the quantitative relationship between bin fractionation and the longitudinal resolution and lateral resolution, carrying out prestack shot-domain optimized deconvolution, and carrying out azimuth restrained bin fractionation and speed optimized analysis, thus acquiring a progressive frequency-divided residual correction image; and carrying out multiple three-dimensional prestack migrations, and establishing a three-dimensional prestack migration speed model, thus acquiring a prestack migration image. Thus, the method provided by the invention provides a reliable guarantee for improving the exploration development precision and upgrading a seismic exploration technology.

The invention provides a seismic inversion method and a device. The method comprises the following steps: determining the vertical slowness relation of plane P-wave in a reservoir to be tested based on the value of P-wave velocity in the vertical direction in the reservoir to be tested, the change of P-wave velocity with phase angle near vertical incidence, the horizontal slowness, and the difference between P-wave velocity in the transverse direction and P-wave velocity in the vertical direction; determining the vertical slowness relation of plane S-wave in the reservoir to be tested according to the value of S-wave velocity in the vertical direction in the reservoir to be tested; and building a new reflection coefficient calculation approach of a transversely isotropic medium with a vertical symmetry axis, and inverting the reservoir to be tested. In the embodiment of the invention, the two relations have high calculation accuracy, and have a relatively simple form and relatively weak nonlinearity. The simplified reflection coefficient calculation approach has high calculation accuracy under the conditions of strong anisotropy, large impedance difference and large incident angle. The accuracy of oil exploration is improved.

The invention provides a method and a system for simulating air gun hypocenter wavelets for offshore seismic prospecting. The method includes measuring basic parameters of seawater and air gun devices; calculating a throttle constant of a gun body, an initial temperature of a gun chamber of an air gun, an initial molar mass of a gas in the gun chamber, an initial molar mass of the gas in a bubble, a molar mass of the gas in the balanced bubble, initial still water pressure, an initial radius of the bubble, an initial volume of the gas in the bubble and a bubble balancing radius; determining a function of a temperature time history of the bubble in the vibration process of the bubble, a function of a molar mass time history of the gas in the bubble and a function of a volume time history of the gas in the bubble; simulating a time history seawater viscosity; simulating a pressure wave produced by the bubble in consideration of the seawater viscosity and a ghost reflection pressure field; using the pressure wave produced by the bubble to simulate a ghost reflection pressure wave of the pressure wave; and overlying the pressure wave produced by the bubble and the ghost reflection pressure wave to synthesize the air gun wavelets. By means of the method and the system, the consistency of simulation wavelets and actual measurement wavelets is enhanced.

The invention relates to a velocity and acceleration two-parameter digital geophone, so that a problem that surveying accuracy is poor in the prior art can be solved. A micro electromechanical system acceleration transducer and a moving-coil velocity detector are integrated into one to form a digital detector that is capable of simultaneously collecting two physical quantities: velocity and acceleration of a same receiving point and has functions of signal collection and reception of velocity and acceleration at a same receiving point; therefore, subsequent data processing and analyzing can be carried out in fields of velocity and acceleration that are different physical quantities for describing displacement of the same receiving point and then comparison and analyzing are carried out. The digital geophone has advantages that: a seismic wave spreading characteristic can be studied precisely and surveying accuracy can be improved.

The invention discloses a common source receiving system of a seismic prospecting instrument and a VSP logging instrument. The system comprises the seismic prospecting instrument, a modulator, an encoder, a first broadcasting station arranged at the position where the seismic prospecting instrument is located, a second first broadcasting station arranged at the position where a shotpoint excitation device is located, a decoder, the shotpoint excitation device, a surface geophone, a VSP borehole geophone, a third broadcasting station and the VSP logging instrument, wherein the surface geophone and the VSP borehole geophone are arranged at receiving points, and the third broadcasting station is arranged at the position where the VSP logging instrument is located. The precise and synchronous relation among the seismic prospecting instrument, the VSP logging instrument and the excitation point is ensured through the modulator, the encoder, the decoder, the demodulator and radio stations connected between the modulator, the encoder, the decoder and the demodulator, two-dimensional and three-dimensional seismic exploration and VSP logging working are synchronously carried out, the shotpoint focus is shared, repeated excitation of the same excitation points in the same working area by the seismic exploration and the VSP logging is avoided, and the excitation workloads are saved by two times.

The invention provides a transient electromagnetic transmitting coil self-induction signal eliminating method and device. The method includes the following steps that: a rectangular loop source is adopted to detect secondary induction transient electromagnetic field data of an area to be estimated with predetermined observation parameters; transmitting coil self-induction signal transient electromagnetic field data are obtained based on the predetermined observation parameters; and the difference value of the secondary induction transient electromagnetic field data and the transmitting coil self-induction signal transient electromagnetic field data is calculated, and the interference of transmitting coil self-induction signals are eliminated according to the difference value, so that the electromagnetic induction signals of the area to be estimated can be obtained. With the method and device adopted, the degree of distortion at an early stage is reduced, and exploration accuracy is improved.

The invention provides a method for correcting diurnal variation of a natural electric field. As for the method, natural electric field measuring equipment is adopted to collect natural electric fieldsignals of a known geological point at a certain time interval, according to the natural electric field acquisition time, frequency and other parameters, a formula is adopted to correct natural electric field data of other measuring points, wherein the formula is F<n>(f)=(U<n>(T<n>,f)-U<0>(T<n>,f)*L<0> / U<0>(T<n>,f) / L<n>, thus the random change and interference of the natural electric field signals are eliminated, the geological conditions of the measuring area is more truly reflected, the quality of the natural electric field data in the whole measuring area is improved, and the exploration effect is improved.

The invention discloses a method of exploring morphological characteristics of a gorge bank slope deep-buried underground large karst cave. According to the method, through excavating a horizontal exploratory cave to the karst cave at the gorge slope, if the karst cave is a filled karst cave, the tail-end section of the exploratory cave is expanded to form an operation room, the operation room is internally provided with a geological drilling rig for karst cave exploration operation, and if the karst cave is a half-filled or non-filled karst cave, the horizontal exploratory cave only needs to be communicated with the karst cave. karst cave filling material can be sampled, analyzed and tested in a near distance, and on the basis of improving the karst cave exploration precision, the drilling engineering quantity and the exploration fee can be saved obviously, and the exploration period is shortened.

The invention discloses an array antenna source for advanced transient electromagnetic tunnel forecast. The array antenna source comprises multiple emission units, wherein the back of each emission unit is an external power source, the emission units respectively comprise an emission antenna, a spiral wire and a foundation, the spiral wire is wound at periphery of the emission antenna, an isolation layer is arranged between the spiral wire and the emission antenna to prevent current contact, the mutual inductance elimination effect is further realized, one side of a recess portion of a foundation center is an access port of the external power source, the other side of the access portion is provided with a needle array used for plugging the emission antennas, and periphery of the foundation has corresponding projections and recesses which are used for splicing the multiple emission units into one body. According to the array antenna source, emission field source intensity can be improved through changing source parameters and emission current intensity, exploration depth is improved, emission source pulse width is changed, high frequency harmonic wave components are improved, exploration precision is improved, high-resolution long distance exploration can be realized, and precise detection on a water guide channel in front of a tunnel face can be realized.

The invention provides an observation system optimization method and device for signal-to-noise ratio consistent energy illumination of a target layer. The method comprises the steps that a near-surface signal-to-noise ratio library is established; a target layer illumination result is combined on the basis of the near-surface signal-to-noise ratio library to form a signal-to-noise ratio illumination analysis result based on the target layer; and consistency processing is carried out on the illumination result to optimize an observation system. According to the invention, the signal-to-noise ratio weight factor is added on the basis of conventional target layer ray illumination; in addition to considering the influence of a velocity field on the illumination, the influence of factors suchas near-surface structure, lithology, excitation parameters and surface fluctuation elevation on the illumination result are mainly considered; the design optimization of the observation system basedon the signal-to-noise ratio consistent energy illumination of the target layer is more in line with the actual situation, and can better guide the design and evaluation of a field observation system;and collected seismic data have higher energy and signal-to-noise ratio, which ensures the data quality and improves the exploration accuracy.

The invention relates to the technical field of magnetic exploration, and discloses a device for surveying the position of a magnetic mine according to underground magnetic field distribution. The device comprises a ship body, a support is hinged to the bottom of the ship body, a wire is inserted into the support, the outer side of the wire is fixedly connected with a bottom plate, a sliding block is hinged to the inner wall of a swing rod, a driving lever is welded to the inner top of the support, an electromagnet is fixedly connected to the inner wall of a transmission wheel, an ejector rod is slidably connected to the inner bottom of the transmission wheel, and a friction plate is hinged to the inner bottom of the transmission wheel. According to the device for surveying the position of the magnetic mine according to the underground magnetic field distribution, a counterweight mechanism descends to drive a roller to descend, the roller rotates under the action of friction force of the wire, the roller rotates to drive a worm to rotate, the worm drives a worm gear to rotate, the worm gear drives a cutting ring to rotate, and the cutting ring and the counterweight mechanism are used in cooperation, so the effects of equipment blockage prevention and stable operation are achieved.

The invention discloses a seismic data reconstruction method, device and equipment and a medium, and is applied to the technical field of seismic exploration and used for solving the problems of relatively high acquisition cost and relatively low exploration precision of high-density seismic data in the prior art. The method specifically comprises the following steps: training a deep neural network model representing a nonlinear mapping relationship between sparse seismic data and high-density seismic data by using the sparse seismic data and the high-density seismic data of each geologic model, so that the finally trained seismic data reconstruction model can obtain the high-density seismic data according to the to-be-reconstructed sparse seismic data, thereby achieving the reconstruction of the seismic data, reducing the collection cost of the high-density seismic data, and improving the exploration precision of the high-density seismic data.

The invention discloses a moving coil detector for simultaneously detecting speed and acceleration. The moving coil detector for simultaneously detecting speed and acceleration is based on a traditional moving coil detector structure, two large flat plate electrodes are arranged above and below a moving coil moving part as a moving capacitor, and one flat plate electrode is respectively arranged on the upper surface and the lower surface of the inner side of a shell as a fixed polar plate, so that a capacitor is respectively formed on the upper part and the lower part of a moving coil to formthe structure of a capacitive accelerometer; two side surfaces of the moving coil are also respectively provided with a capacitor polar plate as a moving polar plate, and the position of the inner wall of the corresponding shell is also provided with a capacitor flat plate as the fixed polar plate, so that two capacitors are formed on the side surface of the moving coil; the upper capacitor and the lower capacitor are connected with the subsequent detection circuit. The beneficial effect of the moving coil detector for simultaneously detecting speed and acceleration is that the double-parameter acquisition and reception of the speed and the acceleration of the same receiving point can be achieved, weak signals can be detected, the propagation characteristics of the seismic waves can be studied more finely, and the exploration precision can be improved; the system structure is simple and the sensitivity is high.

The present invention discloses a method for identifying natural gas hydrate (NGH) by using the incremental ratio between the wave impedance of longitudinal and traverse waves. The method comprises the following steps: (1) inverting the longitudinal wave impedance ZP=VP rho of strata and the transverse wave impedance ZS=VS rho of strata by using seismic data; (2) obtaining the longitudinal wave impedance ZP0 and the transverse wave impedance ZS0 of water-saturated strata; (3) obtaining the longitudinal wave impedance increments delta ZP=ZP-ZP0 and the transverse wave impedance increments delta ZS= ZS-ZS0; (4) obtaining the incremental ratio Ratio of the wave impedance of longitudinal and traverse waves; (5) inverting the porosity of strata; (6) determining the threshold value of the incremental ratio of the wave impedance of longitudinal and traverse waves according to the porosity; (7) judging whether the incremental ratio Ratio of the wave impedance of longitudinal and traverse waves is higher than the threshold value, if so, indicating that the strata contain the NGH; and (8) drawing the bisect where the incremental ratio of the wave impedance of longitudinal and traverse waves is higher than that of the threshold value, wherein the bisect can reflect the distribution range of underground NGH. The method of the invention improves the reliability of the identification results of NGH, greatly improves the exploration precision of NGH and reduces the dry-well rate.

The invention discloses a common source receiving system of a seismic prospecting instrument and a VSP logging instrument. The system comprises the seismic prospecting instrument, a modulator, an encoder, a first broadcasting station arranged at the position where the seismic prospecting instrument is located, a second first broadcasting station arranged at the position where a shotpoint excitation device is located, a decoder, the shotpoint excitation device, a surface geophone, a VSP borehole geophone, a third broadcasting station and the VSP logging instrument, wherein the surface geophone and the VSP borehole geophone are arranged at receiving points, and the third broadcasting station is arranged at the position where the VSP logging instrument is located. The precise and synchronous relation among the seismic prospecting instrument, the VSP logging instrument and the excitation point is ensured through the modulator, the encoder, the decoder, the demodulator and radio stations connected between the modulator, the encoder, the decoder and the demodulator, two-dimensional and three-dimensional seismic exploration and VSP logging working are synchronously carried out, the shotpoint focus is shared, repeated excitation of the same excitation points in the same working area by the seismic exploration and the VSP logging is avoided, and the excitation workloads are saved by two times.

The present invention proposes an observation system optimization method and device for the consistent energy illumination of the target layer signal-to-noise ratio. The method includes: establishing a near-surface signal-to-noise ratio library; , form the lighting analysis results based on the signal-to-noise ratio of the target layer; perform consistency processing on the lighting results, and optimize the observation system. On the basis of conventional ray lighting of the target layer in the past, the present invention increases the weight factor of the signal-to-noise ratio. In addition to considering the influence of the velocity field on the lighting, the present invention mainly considers the impact of factors such as near-surface structure, lithology, excitation parameters, and surface relief elevation on the surface. The impact of the lighting results makes the design optimization of the illumination observation system based on the consistent energy of the signal-to-noise ratio of the target layer more in line with the actual situation, and can better guide the design and evaluation of the field observation system, so that the collected seismic data has higher energy and signal-to-noise ratio, ensuring Improve data quality and improve exploration accuracy.

Embodiments of the application provide a method and device for determining a depth domain quality factor, wherein the method comprises the following steps: acquiring a seismic record of a target area;acquiring a time domain offset gather and a seismic reflection interface according to the seismic record; performing autocorrelation processing on the time domain offset gather at the seismic reflection interface to obtain an autocorrelation function of the time domain offset gather; acquiring an amplitude spectrum of the autocorrelation function of the time domain offset gather; determining an effective quality factor according to the amplitude spectrum; and determining a depth domain quality factor according to the effective quality factor. Since the scheme first performs autocorrelation processing on the time domain offset gather and acquires an amplitude spectrum according to the processed autocorrelation function so as to eliminate the noise interference in the data and obtain a moreaccurate amplitude spectrum, and then determines an effective quality factor using the amplitude spectrum to determine a depth domain quality factor, thereby solving the technical problem of determining the depth domain quality factor with poor accuracy and low resolution in the existing methods.

The invention discloses a complex surface three-dimensional exploration first-motion wave time determining method utilized in oil geophysical prospection. The method is realized through the following steps: a sectorial subregion is divided by taking a shot point as a circle center in the area surrounding the shot point position of a seed cannon and a rectangular region; fitting a straight line tothe first-motion wave time on the shot-geophone distance so as to obtain the slope of the straight line; the apparent velocity of each path of the seed cannon is calculated by utilizing weighted distance; a non-seed cannon surrounding the seed cannon and nearest the seed cannon is taken as an extrapolation object; and the time difference caused by the distance difference between the seed cannon and the non-seed cannon is calculated, so as to obtain the first-motion wave time of the non-seed cannon by calculating the time difference and the first-motion wave time of the seed cannon. The invention has the advantages that the first-motion wave estimating efficiency is improved by times; the handling quality is improved; the exploring accuracy is improved; and the first-motion wave time determining method of the position of stratum containing oil and gas is better carried out.

The invention provides a three-dimensional high-precision bin fractionation processing and evaluation technology for seismic data, and the method comprises the following steps: analyzing original data, and carrying out trace header modification, grid definition and linear normal moveout correction on data acquired by an observation system, thus acquiring a prestack multi-domain composite denoisedimage; based on the relationship between bin fractionation and the signal-to-noise ratio as well as the relationship between bin fractionation and the multiplicity during forward modeling, comprehensively compensating for the vibration amplitude, thus acquiring a tomographic inversion refracted wave static correction image; analyzing the quantitative relationship between bin fractionation and thelongitudinal resolution and lateral resolution, carrying out prestack shot-domain optimized deconvolution, and carrying out azimuth restrained bin fractionation and speed optimized analysis, thus acquiring a progressive frequency-divided residual correction image; and carrying out multiple three-dimensional prestack migrations, and establishing a three-dimensional prestack migration speed model, thus acquiring a prestack migration image. Thus, the method provided by the invention provides a reliable guarantee for improving the exploration development precision and upgrading a seismic exploration technology.

The invention discloses a one-dimensional joint inversion method for time-frequency electromagnetic data and magnetotelluric data. The transmitting frequency of the joint inversion time-frequency electromagnetism ranges from 0.025 Hz to 100 Hz, the frequency of the magnetotelluric sounding ranges from 0.0005 Hz to 320 Hz, the distances between all time-frequency electromagnetic measuring points and all magnetotelluric measuring points are calculated, the nearest magnetotelluric measuring point is obtained, data of the magnetotelluric measuring point are extracted, a joint inversion Jacobian partial derivative matrix of the time-frequency electromagnetism and the magnetotelluric sounding is calculated, a target function is calculated according to the regularization inversion principle, the target function is minimized through the conjugate gradient iterative algorithm, and when the fitting error of the target function reaches the set error standard or the iterations exceed the set maximum iteration number, the joint inversion is finished. According to the one-dimensional joint inversion method, the underground dielectric resistivity distribution below a measuring line can be obtained, the interpretation requirements for structures, faults and entrapments can be met, and the joint inversion result shows that the resolution from shallow to deep is higher than the resolution of the inversion result obtained by independently using time-frequency electromagnetic data.

The invention provides a transient electromagnetic step response acquisition method, which comprises the following steps of: performing full-time sampling and recording on any transient electromagnetic emission waveform and response to obtain transient electromagnetic full waveform and transient electromagnetic full waveform response; discretizing the transient electromagnetic arbitrary transmitted waveform by adopting a pulse waveform, and obtaining a relational expression of transient electromagnetic arbitrary waveform response and transient electromagnetic step response after concluding and recurring a discretized result; transient electromagnetic arbitrary waveform response can be converted into step waveform response by adopting the relational expression. According to the method for acquiring the transient electromagnetic step response, the transient electromagnetic step response under an ideal condition can be acquired, so that the exploration precision is improved.

The invention provides a static displacement correction method, a device and an intelligent terminal in a controllable source electromagnetic measurement, which relate to the technical field of geophysical electromagnetic exploration, and include acquiring a measurement magnetic field and a measurement point at a receiving area corresponding to an excitation field source of an electrical source The electric field is measured; the corrected apparent resistivity is calculated based on the measured magnetic field; the corrected electric field is obtained according to the corrected apparent resistivity, and the measured electric field is corrected based on the corrected electric field. The invention effectively reduces the influence of the static displacement on the collected data in the controllable source electromagnetic method detection, and improves the exploration accuracy.

The invention provides a method and a device for conducting reservoir prediction and based on earth surface consistency deconvolution. The method includes collecting earthquake records formed by reflection earthquake signals from underground, generating a target function according to the earthquake records, conducting earth surface consistency deconvolution on the earthquake records to obtain shot point components and demodulator probe components, conducting minimum phase processing on the shot point components and the demodulator probe components to obtain minimum phase shot detection response, acquiring earthquake records free of non-geological factors according to the target function and the minimum phase shot detection response, mapping an earthquake section image according to the earthquake records free of the non-geological factors, comprehensively interpreting the earthquake section image to obtain a reservoir prediction result. The method and device removes effect of collection and earth surface factors on the earthquake records, improves real underground structure reflection capability of earthquake files and further improves reservoir prediction accuracy.

The invention relates to an oil exploration device high in exploration precision. The oil exploration device comprises a body and a plurality of supporting columns. The body is internally provided with a protection groove, two air blowers and two detection mechanisms. The protection groove is internally provided with a cutting mechanism. The cutting mechanism comprises a lifting unit, a lifting plate, a first motor and a plurality of blades. The lifting unit comprises a driving assembly, a movable block, a movement groove, a telescopic frame, a slider and a slide groove. Each detection mechanism comprises a limiting groove, a stretch-out unit, an abutting unit and a dustproof unit. Each stretch-out unit comprises a second motor, a lead screw, a nut, a connecting rod and a limiting block. Through the cutting mechanism, the oil exploration device can remove vegetation on a detection site, prevent the vegetation from influencing the spreading of detection waves sent out by probes, and ensure the exploration precision of the oil exploration device; moreover, through the detection mechanisms, the oil exploration device can collect the probes back into the limiting grooves after the exploration work is completed so that the probes can be prevented from being damaged.