233 results about "Apparent resistivity" patented technology

The invention belongs to the field of geophysical exploration, and particularly relates to an aviation natural source electromagnetic method complex medium parallel three-dimensional forward modeling method. Comprising the following steps: S1, constructing a three-dimensional geological geometric model of a research area; s2, generating a model unstructured tetrahedral mesh; s3, setting anisotropic conductivity tensor and magnetic conductivity of the model unstructured tetrahedral mesh; s4, constructing a frequency domain electric field control equation; s5, adopting a vector finite element discrete electric field control equation; s6, setting boundary conditions; s7, solving a finite element linear equation; s8, calculating three components of an electric field and a magnetic field at the measuring point and the base station; and S9, calculating impedance, apparent resistivity, phase and tipper data at the measuring point. According to the method, a three-dimensional forward modeling algorithm is provided for the aviation natural field source electromagnetic method, a basis is provided for research of the aviation natural field source electromagnetic method theory and inversion interpretation of actual observation data, and then the aviation natural field source electromagnetic method can better serve the application fields of mineral exploration, engineering exploration and the like.

The invention belongs to the technical field of oil-gas exploration and development, and relates to a transient electromagnetic wave through casing resistivity measurement method, which comprises the following steps of: establishing a cased well stratum model by considering a borehole, a casing and a stratum and combining transient electromagnetic wave logging characteristics; in the cased well stratum model, resistivity is measured by adopting an apparent resistivity extraction method based on a late signal, or an anomaly-background method based on a middle signal, or a compensation differential coil structure; the compensation differential type coil structure comprises a transmitting coil and at least one compensation coil system, the compensation coil system at least comprises a first receiving coil and a second receiving coil which are sequentially arranged, the transmitting coil and the second receiving coil are wound in the forward direction, and the first receiving coil serves as the compensation coil and is wound in the reverse direction; and the transmitting coil and the compensating coil system are sequentially arranged from front to back. According to the method, the transient electromagnetic wave through casing logging response precision can be improved, and formation resistivity extraction under the influence of a high-conductivity casing is achieved.

The invention discloses a multi-source data detection fused surface karst zone structure prediction method and device. The method comprises the steps of S1, obtaining apparent resistivity data detected by a high-density electrical method, electromagnetic wave data detected by a ground penetrating radar and remote sensing data of an overground environment; s2, extracting spatial distribution of surface environment factors based on the remote sensing image; s3, according to the apparent resistivity data, the electromagnetic wave data and the corresponding spatial distribution data, preliminarily determining soil and surface karst zone thickness data of the measured karst area; s4, the apparent resistivity data, the electromagnetic wave data, the surface environment factors and the corresponding thickness data form a training data set, and the model is trained to obtain a surface karst zone structure prediction model; and S5, inputting data obtained in real time into the surface karst zone structure prediction model to obtain a prediction result. The method has the advantages of being simple in implementation method, low in cost, high in prediction precision and efficiency and the like.

The invention provides a resistivity value energy ray estimation method for a termite ant cave position of a reservoir dam, and the method comprises the steps: calibrating different types of reservoir dams, and taking a corresponding determined termite ant cave of the reservoir dam as a calibration position; detecting all calibration positions by using a transient electromagnetic detector to obtain sampling data, and taking the sampling data as a background value; detecting the whole dam body of the target reservoir dam by using a high-resolution transient electromagnetic detector, and calculating the net block-shaped apparent resistivity value of the whole dam body; and determining the termite cave position of the target reservoir dam according to the net block apparent resistivity value and the background value. After the specific reservoir dam is calibrated, the termite cave position of the corresponding dam can be determined based on the sampling data and the background value of the high-resolution transient electromagnetic detector of the reservoir dam, so that the precision and the efficiency of detecting the termite cave position of the reservoir dam can be improved under the condition that the reservoir dam is not damaged.

The invention provides a processing method using two-dimensional time-frequency electromagnetic data. The processing method comprises the following steps: obtaining collected time domain electric field data of a measuring point on a measuring line, and carrying out de-noising processing to obtain a time domain electric field database after de-noising correction; obtaining a measuring point frequency domain electric field amplitude and phase database on the acquisition measuring line based on Fourier transform; obtaining frequency domain-apparent resistivity data based on the whole-area apparent resistivity definition; carrying out three-dimensional fine processing on the original data by utilizing the electrical information; carrying out time-frequency electromagnetic three-dimensional inversion; the depth domain-resistivity data obtained through time-frequency electromagnetic three-dimensional inversion are analyzed and processed; extracting a time-frequency electromagnetic three-dimensional inversion depth domain-resistivity result of a corresponding seismic survey line coordinate; and carrying out comprehensive geological interpretation application in combination with seismic data. The method for carrying out three-dimensional processing, three-dimensional inversion and application on the two-dimensional time-frequency electromagnetic data is realized, and the inversion precision and accuracy of the two-dimensional time-frequency electromagnetic data are improved.

The invention discloses an electrical source transient electromagnetic data imaging method, device and system, and a storage medium. The method comprises the following steps: S1, observing a horizontal electric field Ex and a vertical induced voltage Vz at the same measuring point; s2, respectively solving first-order derivatives of the horizontal electric field Ex and the vertical induced voltage Vz to the time t; s3, calculating the whole-period apparent resistivity according to the first-order derivative; and S4, time-depth transformation is carried out according to the whole-period apparent resistivity, and apparent resistivity depth imaging is realized. By adopting the technical scheme of the invention, the influence of the emission source is eliminated, and the imaging precision and convenience of the electrical source transient electromagnetic method can be obviously improved.

The invention discloses a time sequence gradient structure constraint-based time shift resistivity inversion imaging method, which comprises the following steps of: firstly, acquiring apparent resistivity data at a plurality of moments, and performing independent inversion imaging by using a conventional electrical method at the initial stage of monitoring; and at the subsequent moment, gradient structure constraints of the previous moment are introduced into a traditional electrical method regularization inversion objective function, that is, gradient structure information of an inversion result of the previous moment is introduced into the inversion objective function for constraint, so that an inversion imaging result of the next moment based on the gradient structure constraints of the model of the previous moment is obtained. The electrical difference at the next moment is effectively regulated and controlled, so that the resolution of gradient structure constraint inversion is higher, the capability of an inversion model on boundary analysis is enhanced, the change process of the geological condition is accurately captured, the formation process of the geological anomalous body can be effectively distinguished finally, the resolution of the time shift resistivity method on the anomalous body boundary is improved, and the accuracy of the time shift resistivity method is improved. Accurate monitoring of the development process of the geological anomalous body is realized.

The invention discloses a dam leakage channel detection and danger elimination quality evaluation method based on transient electromagnetism, and relates to the technical field of earth and rockfill dam danger elimination and reinforcement. The method comprises the following steps: A, leakage channel detection: A1, data acquisition: performing data acquisition on a dam by adopting pull-type small loop transient electromagnetic equipment to obtain original electromagnetic signal data; a2, forward modeling: performing forward modeling on the acquired data, and calculating a theoretical attenuation curve and apparent resistivity distribution by considering special boundary conditions of the dam; and A3, carrying out inversion calculation. According to the method, leakage signals can be accurately captured based on the high sensitivity of a transient electromagnetic method to a low-resistance body, the used pull-type small-loop transient electromagnetic equipment is convenient to operate, a dam can be comprehensively covered by combining reasonable measurement point arrangement, forward modeling and inversion calculation can comprehensively consider various factors, the position and depth of a leakage area are determined, and the detection accuracy is improved. Compared with a traditional method, the method has obvious advantages in detection depth and accuracy.

The invention discloses a transient electromagnetic global apparent resistivity definition method based on differential pulses, and relates to the technical field of artificial source electromagnetic detection, and the method comprises a transient electromagnetic field response calculation method based on a step wave emission waveform, and an electromagnetic forward modeling method for obtaining the differential pulses by adopting a time shift method. Based on a differential pulse transient electromagnetic forward modeling method, electromagnetic fields under different pulse widths, different flight heights and different offsets are calculated, and curve characteristics of the electromagnetic fields changing along with resistivity are analyzed; selecting a target electromagnetic field component, and adopting an inverse function theorem to obtain a global apparent resistivity iteration expression based on a differential pulse emission waveform; according to the transient electromagnetic global apparent resistivity defining method, the global apparent resistivity of multiple pulse width differential pulses is calculated through a global apparent resistivity iteration expression, underground comprehensive electrical characteristics are obtained through a correlation superposition algorithm, and the transient electromagnetic data interpretation capacity is improved through the transient electromagnetic global apparent resistivity defining method.

The invention discloses a reservoir fluid property identification method, system and device and a storage medium. The method comprises the steps that inversion apparent resistivity data and logging data of a research area are acquired; performing first-order derivation on the inversion apparent resistivity data to obtain first-order derivation data; based on logging data, corresponding weight coefficients are distributed to the average thin layer thicknesses of different reservoirs, and the resistivity corresponding relation between the apparent resistivity and the logging resistivity is established; determining logging resistivity value difference standard data among different reservoir fluids in the research area according to the logging data; apparent resistivity value difference standard data are determined according to the resistivity corresponding relation and the logging resistivity value difference standard data; and determining fluid boundaries of different reservoirs according to the apparent resistivity value difference standard data and the sawtooth points of the first-order derivation data. According to the reservoir fluid property identification method, system and device and the storage medium provided by the embodiment of the invention, the accuracy of reservoir fluid property identification can be improved.

The invention discloses a coal mine tunnel shield excavation-following multi-frequency alternating current parallel advanced detection method and system, and the method comprises the steps: arranging a three-direction data observation system in a tunnel excavation direction; collecting a three-direction potential difference amplitude value and a three-direction potential difference phase value for the arranged three-direction data observation system by adopting a multi-frequency pseudo-random galvanic couple source emission mode; the obtained three-direction potential difference amplitude value and the potential difference phase value are sent to professional software based on a Cole-Cole model for inversion, and a three-dimensional apparent resistivity image and a three-dimensional apparent charging rate image are obtained; according to the method, the problems that a traditional advanced detection method is insufficient in space positioning of a geologic body and detection is carried out while excavation under the tunnel shield condition are solved, and technical support is provided for tunnel shield excavation-while-excavation water disaster detection.

The invention discloses a non-contact geomagnetic coil single-frequency and multi-frequency combined stratum exploration method. The method comprises the following steps that S1, observation parameters are calculated according to exploration requirements; s2, transmitting a single-frequency vertical coil, and moving and scanning a three-component coil; s3, the apparent resistivity and the apparent polarizability of the earth are quickly found through transverse and longitudinal table look-up; s4, quickly identifying a regional stratum, and dividing abnormal sections; s5, abnormal section multi-frequency static data acquisition; s6, multi-frequency data longitudinal underground layering inversion is carried out; and S7, performing combined output of plane quick sweeping and section layering results. According to the method, the precision of the exploration result and the data accuracy are guaranteed, the final exploration result is combined with the plane section and the longitudinal section, the exploration efficiency is guaranteed, the exploration precision can be guaranteed, and the exploration cost is greatly reduced on the premise that the exploration precision is guaranteed.

The invention belongs to the technical field of oil-gas exploration and development, and relates to a transient electromagnetic wave through casing resistivity measurement method, which comprises the following steps of: establishing a cased well stratum model by considering a borehole, a casing and a stratum and combining transient electromagnetic wave logging characteristics; in a cased well formation model, the resistivity is measured by adopting an apparent resistivity extraction method based on a late signal, and the resistivity measurement method of the apparent resistivity extraction method based on the late signal comprises the following steps: simulating different formation resistivity in the cased well formation model; a single-transmitting single-receiving coil structure is adopted to measure zz component induced electromotive force of late transient electromagnetic wave logging; the apparent resistivity is extracted according to the late transient electromagnetic wave logging zz component induced electromotive force signal, and the extracted apparent resistivity is the transient electromagnetic wave through casing resistivity. According to the method, the transient electromagnetic wave through casing logging response precision can be improved, and formation resistivity extraction under the influence of a high-conductivity casing is achieved.

The invention provides a single-valued transient electromagnetic apparent resistivity calculation method based on deep learning, and the method comprises the following steps: a), carrying out the normalization processing of an actually-measured induced voltage, and obtaining a normalized induced magnetic field; b) a deep neural network model comprising an input layer, a plurality of hidden layers and an output layer is constructed, the input layer receives the normalized induced magnetic field, and the output layer outputs transient field parameters; c) training the deep neural network model by using a Nadam optimization algorithm, wherein a training sample set comprises multiple groups of actually measured induced voltages and transient field parameters corresponding to the actually measured induced voltages; and d) inputting the actually measured induced voltage to be measured into the trained deep neural network model, obtaining the output transient field parameters, and calculating the apparent resistivity according to the theoretical formula of the transient electromagnetic field. Compared with a traditional method, the method has the advantages that the fitting capacity of nonlinear data is higher, and the transient electromagnetic apparent resistivity can be solved more accurately.

The invention provides a fluid identification method, device and equipment and a storage medium, and the method comprises the steps: obtaining the geological information data of a to-be-identified region, building a plurality of well-connecting stratigraphic framework profiles, and calibrating the horizon; obtaining first wide-area apparent resistivity data of all layers in the to-be-identified area and second wide-area apparent resistivity data of a target layer in the to-be-identified area, and replacing the data of the target layer in the first wide-area apparent resistivity data with the second wide-area apparent resistivity data to obtain an electrical comprehensive data volume; carrying out joint constraint inversion according to the multiple well-connected stratigraphic framework profiles and the electrical comprehensive data volume to obtain multiple inversion apparent resistivity distribution profiles, determining a target inversion apparent resistivity distribution profile, obtaining a wide-area fluid identification standard, carrying out fluid identification division on the multiple inversion apparent resistivity distribution profiles, and carrying out fluid identification division on the wide-area fluid identification standard. And further obtaining a fluid plane identification result of the to-be-identified area. According to the invention, high-precision fluid identification of the target layer in the to-be-identified area can be realized through the logging data and the electromagnetic data.

The invention discloses a high-density electric quantitative interpretation method based on a soil resistivity calculation model, and the method specifically comprises the steps: 1, measuring the physical characteristics of a sampling soil body in a detection region, carrying out the orthogonal test of main influence factors of the resistivity of the soil body, and analyzing the primary and secondary factors which affect the change of the resistivity; 2, selecting three factors with large influence degrees to carry out a quantitative test, and determining a quantitative relationship between the resistivity of the soil sample and the influence factors; step 3, based on the quantitative relation between the resistivity and each influence factor, fitting to obtain a soil resistivity calculation model of the detection area; 4, carrying out a nondestructive testing field test on the detection area to obtain an apparent resistivity image of the area; and 5, performing qualitative and quantitative double interpretation on a field detection result by combining an indoor test and a field test. The problem that in the prior art, high-density television resistivity result analysis depends on manual subjective experience judgment, and large uncertainty exists is solved.

The invention relates to geophysical inversion, in particular to an electromagnetic inversion method based on well electric-seismic joint modeling, which comprises the following steps: acquiring actually measured apparent resistivity data; well-to-seismic joint stratum thickness and stratum apparent resistivity modeling based on geosteering; performing one-dimensional band source apparent resistivity inversion based on a nonlinear least square fitting algorithm; and outputting a stratum apparent resistivity inversion result. The method is based on geosteering, the advantages of three geophysical prospecting methods of earthquake, logging and electromagnetism are fully fused and played, the multiplicity of electromagnetic inversion solutions is reduced, the inversion depth and accuracy are improved, and powerful guarantee is provided for subsequent section interpretation, well position deployment, fluid identification and other operations. The invention also provides a device for realizing the electromagnetic inversion method based on well electric shock joint modeling.

The invention discloses a method for dividing an electric dipole source CSAMT field region, and the method comprises the steps: defining a last coincidence point of an apparent resistivity curve of a whole region and a far region of an electric field Ex component as a far region separation point from a high-frequency end to a low-frequency end, and recording a corresponding induction number as B = crifar-tran; in the direction from the low-frequency end to the high-frequency end, the last coincidence point of the whole area of the electric field Ex component and the near area apparent resistivity curve is defined as a near area separation point, and the corresponding induction number is recorded as B = critra-new. The method for dividing the field by the determined induction number can adapt to various geoelectric structures, and provides a universally applicable and non-empirical standard for defining the field.

The invention provides a grouting diffusion three-dimensional monitoring system and method and a medium, and relates to the technical field of railway roadbeds, and the system comprises an acquisition module and a data processing module; the acquisition module is used for acquiring apparent resistivity corresponding to a grouting diffusion area in a railway roadbed in parallel; and the data processing module is connected with the acquisition module and is used for performing forward modeling and inversion according to a preset geoelectric model and the apparent resistivity to obtain a three-dimensional apparent resistivity map representing the grouting diffusion range. Thus, on one hand, the collection efficiency of apparent resistivity is improved, on the other hand, a three-dimensional apparent resistivity map can be obtained, three-dimensional real-time monitoring of the slurry flow path, the flow range, the spatial and temporal distribution and the occurrence state in the grouting process is achieved, the slurry diffusion condition is accurately and visually reflected, and the grouting quality is improved. And a basis is provided for grouting reinforcement mechanism research, technical development and scheme optimization.

The invention discloses a transient electromagnetic leakage detection system and method for a concrete dam, and relates to the field of transient electromagnetic method detection, the transient electromagnetic leakage detection system comprises a forward modeling system, an auxiliary device system, an acquisition system and an inversion system, and three concrete transient electromagnetic instrument response characteristics of ultralow water content, high water content and crack water saturation and electric signal differences are obtained through forward modeling; a self-made variable-angle anti-interference rapid survey concrete dam transient electromagnetic instrument auxiliary device with automatic distance measurement is adopted to carry out nondestructive testing on the dam; and integrating the collected data and carrying out inversion, drawing a dam apparent resistivity quasi-section diagram of apparent resistivity-detection depth, identifying the moisture distribution condition of the concrete dam, determining abnormal points, and finally realizing nondestructive detection of the internal leakage of the concrete dam. The detection system and method are convenient to operate, and can integrally move, automatically measure the distance and change important parameters such as the detection angle and the distance, so that the transient electromagnetic instrument can detect the leakage of the concrete dam in a lossless, flexible and anti-interference manner.

The invention relates to the technical field of geophysical exploration, and provides a three-dimensional electromagnetic method fracturing monitoring method which comprises the following steps: collecting parameter data of a target well; establishing a target well work area geoelectric model, and performing forward modeling through the target well work area geoelectric model to select reasonable acquisition parameters; arranging a three-dimensional measuring net according to a fracturing construction scheme; collecting data of a natural field source and an artificial field source in the fracturing monitoring process; processing to obtain natural potential data before and after fracturing, induced polarization method data before and after fracturing, time-frequency electromagnetic method data before and after fracturing, and controllable source magnetotelluric method apparent resistivity data and controllable source magnetotelluric method phase data before and after fracturing; differential abnormal data are obtained through calculation, all the differential abnormal data are comprehensively analyzed, and fracturing fluid and fracture distribution form data in the complete fracturing process are obtained. According to the invention, multiplicity of solutions is reduced, precision and monitoring accuracy are improved, and construction cost is reduced.

The invention belongs to the technical field of earth and rockfill dam deep burying disease identification and positioning, and discloses an earth and rockfill dam leakage channel comprehensive detection method and system, and the method comprises the steps: determining the distribution of detection points detected by an electrical method, and collecting the apparent resistivity data and the apparent polarizability data of the detection points; inverting apparent resistivity and apparent polarizability data to obtain a resistivity profile and a polarizability profile, and obtaining a normalized polarizability profile based on the resistivity profile and the polarizability profile; performing stratum zoning on the to-be-detected area based on the section, determining the soil cation exchange capacity and the cementation index of the zoned stratum, and calculating the soil water content and the permeability of the measured section according to the normalized polarizability, the soil cation exchange capacity and the cementation index; and determining an earth and rockfill dam leakage channel according to a water content and permeability judgment mechanism. According to the method, the uncertainty of a single physical property threshold value method is overcome, and the accuracy and precision of the leakage hidden danger of the earth and rockfill dam are improved.

The invention provides a tunnel geological detection system and method, a storage medium and a computer program product. The system comprises a current source, an emission electrode, a shielding electrode, a backflow electrode, a differential pressure signal measurement module and an acquisition control module. The acquisition control module controls the current source to output current to the emission electrode in a first working mode and controls the current source to output current to the shielding electrode in a second working mode according to the electric field synthesis proportional parameters, so that the emission electrode emits current to a target stratum under the action of electric field superposition, the resistivity determination module is used for determining apparent resistivity corresponding to a target stratum; wherein under the condition that the emission electrode emits the current to the target stratum, the voltage difference information is smaller than the voltage difference threshold value. According to the invention, the measurement precision of the apparent resistivity can be improved, and an accurate geological forecast result is provided; moreover, related hardware circuits do not need to be installed, the tunnel excavation equipment has the tunnel geological detection function, implementation is easy and convenient, and the cost can be reduced.

The invention relates to the technical field of data processing, discloses an earth and rockfill dam leakage positioning method based on joint inversion and data fusion, and aims to solve the problems of limitation and non-uniqueness of an existing single geophysical prospecting method in leakage hidden danger positioning. Converting the first apparent resistivity into a first apparent resistivity; second apparent resistivity distribution of the earth-rock dam is obtained through a high-density electrical method; acquiring electromagnetic wave velocity distribution by adopting a ground penetrating radar method, and converting the electromagnetic wave velocity distribution into third apparent resistivity; performing data standardization processing on the apparent resistivity to obtain standardized apparent resistivity data; performing dimension reduction fusion on the standardized apparent resistivity data corresponding to each apparent resistivity by adopting a principal component analysis method to obtain simulated apparent resistivity distribution; and determining the position of the leakage hidden danger channel in the earth-rock dam based on the pseudo-apparent resistivity distribution. The method improves objectivity, accuracy and reliability of leakage positioning, and is particularly suitable for danger removal and reinforcement of earth and rockfill dams.

The invention relates to the field of geophysical electromagnetic exploration, and provides a time-frequency electromagnetic data processing method, device, equipment and medium, and the method comprises the steps: calculating the similarity offset ratio of each measuring point on a measuring line, and determining a static displacement measuring point on the measuring line based on the similarity offset ratio; calculating equivalent apparent resistivity ratio of static displacement measurement point based on equivalent apparent resistivity of electric field component and corrected equivalent apparent resistivity of magnetic field component corresponding to adjacent measurement points on left and right sides of static displacement measurement point, and updating equivalence of electric field component of static displacement measurement point based on equivalent apparent resistivity ratio and corrected equivalent apparent resistivity of magnetic field component apparent resistivity; and completing static displacement correction in response to the static displacement measuring points on the measuring line, and performing inversion calculation on the magnetic field component amplitude and the electric field component amplitude of each measuring point on the measuring line to obtain resistivity distribution of a preset depth below the measuring line. The scheme disclosed by the invention is beneficial to improving the exploration and prediction precision of the time-frequency electromagnetic oil and gas target.

The invention discloses a tunnel shield interval boulder prediction method, medium and equipment, and the method comprises the steps: S1, obtaining the high-density electrical method apparent resistivity data of a detection region, and carrying out the inversion to obtain an apparent resistivity two-dimensional profile; s2, integrating the two-dimensional profile into a three-dimensional space, and constructing a continuous three-dimensional resistivity data volume; s3, extracting a threshold value abnormal region according to a preset threshold value A, and determining a boulder suspicious region A; s4, background signal propagation characteristics of the boulder-free area are measured through ultrasonic waves, a threshold value B is set, and if the background signal propagation characteristics exceed the threshold value B in the actual measurement process, the boulder-free area is marked as a boulder suspicious area B; and S5, obtaining an intersection of the abnormal coordinates of the boulder suspicious area A and the boulder suspicious area B, generating a closed three-dimensional boulder suspicious area, and outputting a result in a three-dimensional visualization manner. According to the method, the problems of high false anomaly rate, insufficient spatial information, strong subjective dependence and the like of a traditional single geophysical prospecting method are systematically solved, and the accuracy, the reliability and the engineering applicability of boulder detection are remarkably improved.

The invention discloses an interface contact performance distribution characteristic measurement method, which comprises the following steps of: firstly, respectively obtaining the relationship between interface contact resistance and potential difference in two electrode arrangement modes according to the electrode arrangement modes of a contact interface four-wire method and a high-density electrical method; secondly, the relation between the apparent resistivity and the potential difference in a high-density electrical method is introduced, and the relation between the contact resistance and the apparent resistivity in the two electrode arrangement modes is obtained; according to the relation between the contact resistance and the contact displacement and the relation between the contact displacement and the contact stress, the relation between the contact resistance and the contact stress is obtained; finally, the relation between the contact resistance and the apparent resistivity is introduced into the relation between the contact resistance and the contact stress, an interface contact stress-apparent resistivity distribution correlation formula is obtained, the distribution characteristics of the interface contact stress are obtained by measuring the apparent resistivity, and the distribution characteristics of the interface contact performance are finally obtained in combination with the interface morphology. The stress distribution condition of the contact interface can be directly obtained, the method is simple, and the result is accurate.

The invention belongs to the technical field of mine geophysical prospecting, and particularly relates to a three-dimensional direct current method roadway hole combined detection method and system. Firstly, a target drill hole and a roadway measuring line are combined to design a three-dimensional long measuring line; constructing a three-dimensional geologic model and establishing a space coordinate system according to the three-dimensional long measuring line, the mine laneway and the space structure of the stope face, installing an instrument and an electrode in the three-dimensional long measuring line, performing pole shifting to acquire voltage and current data, and calculating apparent resistivity data of the stope face of the mine laneway according to the acquired voltage and current data; performing three-dimensional resistivity inversion fitting calculation on the apparent resistivity data to generate an inversion three-dimensional resistivity data volume; and finally, the inversion three-dimensional resistivity data volume is analyzed, resistivity distribution conditions in different time periods are obtained, and the migration change condition of the water body of the stope face is speculated according to the change condition of the resistivity distribution along with time. The problem that a mine direct current electric method in the prior art still lacks the accuracy of water disaster abnormity monitoring can be solved.

The invention discloses an electrical source transient electromagnetic data three-dimensional inversion method and device, and a storage medium. The method comprises the following steps: S1, collecting a vertical induced voltage and a horizontal electric field component of electrical source transient electromagnetic; s2, the first-order time derivatives of the Vz and the Ex are used for calculating the whole-period apparent resistivity; s3, performing time-frequency conversion to obtain frequency-apparent resistivity data of each measuring point; and S4, performing three-dimensional inversion on the frequency-apparent resistivity data by using a three-dimensional inversion algorithm of magnetotelluric.

The invention relates to the technical field of open hole well logging in petroleum and natural gas exploration and development, in particular to an ultra-thin layer resistivity logging variable K value interpretation method and device, equipment and a medium. The method comprises the steps that stratum parameters are set, forward modeling is carried out to measure five parameters, the theoretical K value and the Rd4-Rs18 value of each layer are calculated according to the five parameters, and the Rd4-Rs18 value of each layer is calculated according to the theoretical K value and the Rd4-Rs18 value; the neural network is trained through set parameters and measurement and calculation parameters, an interpretation model is obtained, resistivity and invasion influence correction is carried out on the variable K value, and three stratum parameters of the variable K value of each layer, the specific value of the stratum and the resistivity of the invasion zone and the radius of the invasion zone can be explained through the interpretation model; the error between the variable K value and the theoretical K value is the quantitative interpretation error of the true resistivity of the stratum; the method is used for solving the problem that the stratum true resistivity value cannot be quantitatively explained due to the fact that the resistivity of the corresponding layer thickness cannot be developed and an invasion influence correction chart cannot be developed due to the fact that the obtained apparent resistivity value of the ultrathin layer is too low and the change range is too small by an original fixed K value explaining method.