Abstract: Disclosed is a synchronization method for an MWD mud pulse telemetry system. The method comprises: determining a synchronous training sequence on the basis of a frame structure of downhole sent data; constructing a correlation between the down-hole sending synchronous training sequence waveform and the uphole synchronous training sequence local waveform by means of the irrelevance of the trigonometric function; and performing correlation calculation on the synchronous training codeword waveform, which is received uphole and is subjected to the first modulation, and the synchronous training sequence local waveform, which is subjected to the second modulation, so as to obtain a correlation curve, and finding a synchronous position by means of the correlation curve.

Abstract: Provided is a wireless time servicing method, device and system. The wireless time servicing method includes: obtaining absolute time information sent by an external clock source; correcting a system time of a master station according to the absolute time information; broadcasting path information to a slave station; receiving feedback from the slave station in response to the path information, calculating a transmission path delay between the master station and the slave station, and storing the transmission path delay in the time information; and sending the time information to the slave station.

Abstract: A method and system for determining an azimuth of a marsquake/moonquake event. The method includes: filtering the original waveform data to obtain filtered waveform data; intercepting filtered waveform data of a set time length to obtain first arrival waveform data of a P wave; performing data analysis on the first arrival waveform data of the P wave, determining the first arrival waveform data of the P wave of an east component as X-column data and the first arrival waveform data of the P wave of a north component as Y-column data; and performing optimal fitting on the X-column data and the Y-column data to obtain a first arrival elliptical locus of the P wave obtained after the optimal fitting, and determining an azimuth of a marsquake/moonquake relative to the single seismic station according to the first arrival elliptical locus of the P wave obtained after the optimal fitting.

Abstract: Provided are a mesomechanics testing system and method integrating heating and observation, relating to the field of rock mechanics testing. The system includes a control and collection module, a loading module, a vacuum module, and an observation module. The loading module and the observation module are both connected to the control and collection module; the loading module is configured to apply a load required by mechanics testing to a mesoscopic sample to be tested, and transmit mechanics testing data to the control and collection module; the vacuum module is configured to provide the mesoscopic sample with a vacuum space for real-time heating and mechanics testing; and the observation module is configured to collect image data of the mesoscopic sample during the mechanics testing, and transmit the image data to the control and collection module.

Abstract: Disclosed is a mapping method of landslide threat range based on equivalent friction coefficient and trend analysis, which includes the following steps: obtaining physical parameters of a landslide, and obtaining a volume of the landslide according to an area in the physical parameters; selecting relevant parameters based on a rock type in the physical parameters, and obtaining the equivalent friction coefficient according to the relevant parameters and the volume; obtaining a landslide runout distance according to the equivalent friction coefficient, determining coordinate points of a hyperbola and a front edge boundary range according to the landslide runout distance, and performing a hyperbolic fitting on two side boundaries of the landslide according to the coordinate points to obtain a side boundary range; generating the landslide threat range based on the front edge boundary range and the side boundary range.

Abstract: The disclosure provides a test device and a test method for isotope measurement of noble gases in lunar soil. The testing device includes a carbon dioxide laser ultra-high vacuum sample melting system, zirconium-aluminum getters, a vacuum dry pump, a first molecular pump, a second molecular pump, a neon gas capture unit, an argon gas capture unit, an argon krypton-xenon capture unit, a dilution tank, a sputtering ion pump and a noble gas mass spectrometer which are connected through pipelines, and each pipeline and each component are connected through a specific way; in addition, control valves for controlling the opening and closing of the pipelines are installed on the connection path between each pipeline and each component, and the disclosure also provides a matching test method.

Abstract: The present invention discloses an automatic identification method and device for planetary seismograph azimuth angles based on a planetary sundial, comprising: obtaining geographical coordinates of a sundial needle tip and a sundial needle tip shadow relative to a planetary surface; determining a theoretical second solar ray elevation angle and a ray azimuth angle; constructing an objective function according to a first solar ray elevation angle and a ray azimuth angle corresponding to a time for obtaining the sundial needle tip shadow; and taking a minimum objective function as a target for solving a planetary seismograph azimuth angle. The present invention determines the planetary seismograph azimuth angle only by optical photos of a planetary rover or a lander without active vibration devices on supporting legs of the lander, thereby reducing system complexity and reducing weight, volume and power consumption brought by additional devices on the supporting legs of the lander.

Abstract: A sample mounting device for direct tensile test of rock mass is provided, which includes a first positioning stage, a second positioning stage, a first support piece, a second support piece, and a screw drive mechanism. The second positioning stage is arranged above the first positioning stage and capable of moving up and down, and cushion blocks for gluing with the rock mass are coaxially and detachably arranged at opposite ends of the first positioning stage and the second positioning stage, and a rock mass mounting area is formed between the two cushion blocks. A screw of the screw drive mechanism includes a first thread segment and a second thread segment with opposite thread directions. The first support piece is connected with the first thread segment through a nut seat, and the second support piece is connected with the second thread segment through a nut seat.

Abstract: The present disclosure belongs to the field of geological prospecting and particularly relates to an intelligent real-time updating method and system for a stratigraphic framework with geosteering-while-drilling, aiming to solve the problems of insufficient precision in position and dipping angle of a stratigraphic framework due to differences in parameters measured by different instruments for well logging and mud logging while drilling.

Abstract: The present invention is in the field of geological exploration and particularly relates to a method and system for gamma ray (GR) while drilling parameter data optimization for deep-filed oil and gas precise navigation, aiming to solve the problem of insufficient measurement accuracy of the depth of a well in the existing drilling technology. The present invention comprises: eliminating outliers from the obtained GR while drilling parameter data and determining the rationality of the eliminated outlier; performing derivation on a real-time updated variance attribute while drilling curve to obtain a real-time updated formation change-point detection result; searching the formation change-point detection result of a pre-drilling predicted well curve; and correcting the drilling depth by comparing the two formation change-point detection results to obtain the accurate depth while drilling.

Abstract: The present disclosure discloses a solving method and system for an Euler angle attitude. The solving method includes: acquiring a rough rotation angle ?T of a tool surface of a drilling tool in a search interval; performing calculation according to the rough rotation angle ?T to obtain a variation range RangeT of the tool surface; disposing a plurality of particles within the variation range RangeT, corresponding position coordinates of the particles to an Euler angle value, randomly generating initial speeds of the particles, calculating a fitness function of each particle, and selecting the particle with the minimum fitness function as an optimal particle; updating a speed and a position of each particle, and gradually moving the particles closer to an optimal position by adopting an iteration method; and after performing n iterations until the precision of the fitness function of the optimal particle reaches a threshold.

Abstract: The present invention belongs to the field of deep navigation, and in particular to a high-precision modeling method and system of three-dimensional velocity field for precise navigation of deep oil and gas. The present invention includes: extracting wave impedance characteristics based on standardized well logging data to obtain a wave impedance curve; acquiring a velocity vector of each location at current depth, to obtain a one-dimensional velocity curve; based on the one-dimensional velocity curve, training a velocity value prediction model based on wave impedance at the current depth; performing wave impedance inversion based on the wave impedance curve at the current depth to obtain a wave impedance inversion data volume; and based on the wave impedance inversion data volume, through the velocity value prediction model based on wave impedance at the current depth, acquiring a three-dimensional high-accuracy velocity volume.

Abstract: The present invention belongs to the field of geologic survey, and particularly relates to a real-time calibration method and system of acoustic logging data while drilling for precise navigation of deep oil and gas, aiming to solve a problem of inability to automatically identify stratum boundaries to adapt to geology at various different depths in an existing drilling process. The method of the present invention includes: acquiring standardized acoustic parameter data while drilling; acquiring time-depth relationship of historical acoustic curve data of drilled wells, and current actual drilling time-depth relationship; performing interpolation based on the current actual drilling time-depth relationship, to acquire interpolated current actual drilling time-depth relationship; correcting the interpolated current actual drilling time-depth relationship; and completing current precise depth correction based on the current actual drilling acoustic curve.

Abstract: A test system and a test method for replacing natural gas hydrate with carbon dioxide are disclosed, relating to the technical field of exploitation of natural gas hydrates. The test system comprises a sample reaction vessel, a sample boundary condition loading device, a methane gas supply device, a carbon dioxide gas supply device, an output article collection and measurement device, and a data acquisition control device. A sample-sealing rubber sleeve and an upper sample-sealing plate are arranged in an inner cavity of the vessel, the sample-sealing rubber sleeve, a lower tray and the upper sample-sealing plate form a sample-sealing space. An axial pressure loading plate is arranged on the upper sample-sealing plate, and an upper cover plate is provided with an axial pressure loading injection hole. A side shrouding is provided with a confining pressure loading injection hole and a product discharge hole.

Abstract: A noise reduction measurement method of acoustic while drilling data based on signal synchronization is provided. The method performs pre-sampling before effective excitation of a low-frequency pulser, then extracts center frequency and phase information of noise of the low-frequency pulser by fast Fourier transform, and adjusts the excitation and sampling time of the acoustic signal according to the center frequency and phase information of the noise of the low-frequency pulser. Accordingly, the coincidence of the acoustic signal excited by the acoustic instrument and the acoustic signal generated by operation excitation of the pulser can be actively avoided, and the signal-to-noise ratio of the received signal of the acoustic instrument can be effectively improved.

Abstract: A signal acquisition method of an azimuthal electromagnetic wave resistivity instrument includes receiving, by a receiving antenna, a magnetic induction signal after formation attenuation, and converting the received magnetic induction signal into an electrical signal; amplifying, by a preamplifier circuit, a fixed gain of a received signal with nV level amplitude induced on the receiving antenna; controlling a filtering circuit to filter the amplified signal; amplifying the filtered signal using a programmable amplifier circuit to generate a target signal; and conducting digital conversion for the target signal that meets the requirements of low-frequency acquisition.

Abstract: Disclosed is a shielding device of source mounting and demounting for a nuclear logging instrument including a device base and a shielding device body. The device base is directly placed on the ground or a well stand. The shielding device body is slidably assembled in an embedded slideway of the device base. During source mounting operation, a worker takes a source from a source container, and a radioactive source passes through the shielding device body through a circular hole of the shielding device body to be installed. During the source demounting operation, the radioactive source and the worker are arranged on both sides of the shielding device body during the operation at an instrument end. Through such design, the worker is allowed to calmly mount and demount the source in a relatively low radiation field.

Abstract: A method for accurately correcting the age of columbite-tantalite by using double-reference-material includes: using at least two kinds of columbite-tantalite with known ages as reference materials; determining the positive correlation between the lead-uranium ion ratio and the uranium ion ratio of the columbite-tantalite based on test results of a lead-uranium ion ratio ( 206 Pb + 238 U 16 ? O + ) Cstd ? 1 and a uranium ion ratio ( 238 U 16 ? O 2 + 238 U 16 ? O + ) Cstd ? 1 of the reference material 1, correcting the correlation by reference material 2; calculating the lead-uranium mass ratio ( 206 Pb 238 U ) un of the columbite-tantalite sample to be tested by using the corrected correlation; finally, determining the uranium-lead age UPbtun of the columbite-tantalite sample to be tested based on the lead-uranium mass ratio ( 206 Pb 238 U ) un .

Abstract: Disclosed are a method, system, and device for full waveform inversion on elastic wave seismic data.

Abstract: The application provides an estimation method of detecting elevation by a semi-airborne electromagnetic method, including the following steps: S1, judging original elevation data to obtain wrong point data and normal data; S2, filtering the wrong point data by an improved Kalman filtering method, and filtering the normal data by a conventional Kalman filtering method; S3, fusing a filtering result of the wrong point data and a filtering result of the normal data, and taking a fused result as a measured value sequence used in a next working process; and S4, repeating the S1-S3 until the fused result meets preset requirements.