9 results about "Surface velocity" patented technology

The present invention provides a method and system for approximating true surface velocity modeling. The method uses a near-surface velocity model obtained by first-arrival wave inversion as an initial velocity model, determines a high-speed top interface based on the model, and then calculates a corresponding surface elevation smoothing surface as the migration starting surface for velocity modeling and migration imaging. The near-surface velocity model is interpolated within the range determined by the high-speed top interface and the surface elevation smoothing surface to ensure that there are no velocity blank areas within the calculation range. Based on this, the relevant velocities within the range determined after interpolation optimization are smoothed to obtain an approximate true surface velocity model for depth-domain velocity modeling. Modeling using this method eliminates imaging errors caused by elevation changes and local velocity anomalies while retaining background velocity. The method can be effectively applied to various surface conditions, including undulating surface conditions and conditions with thick low-velocity reduction zones, and can effectively improve the imaging accuracy of subsequent pre-stack depth migration in various surface conditions.

The embodiment of the application provides a method and device for obtaining surface velocity based on double-well micro logging. The method for obtaining surface velocity based on double-well micro logging comprises the following steps: obtaining first arrival time records of double-well micro logging in a target work area, wherein the double-well micro logging comprises a shooting well and a receiving well; dividing a surface layer of the target work area into a plurality of stratum units according to positions of each shooting point in the shooting well; each stratum unit corresponds to a shooting point; based on initial layer velocities of each stratum unit, iteratively calculating corrected layer velocities of each stratum unit by using a total travel time constraint equation and a horizontal projection distance constraint equation, and obtaining surface velocities of the target work area; wherein the layer velocity is a velocity of a seismic wave propagating in the stratum unit.

This invention relates to a method for mapping surface flow velocity and direction, comprising the following steps: S1, obtaining the engineering grid coordinates (X, X, Y) of the measuring point P using the forward intersection method or GNSS positioning measurement method. n Y n S2, based on the engineering grid coordinates (X) of two adjacent points. n Y n ), (X n+1 Y n+1 Given the time difference Δt, calculate the corresponding surface velocity and direction; S3, create a surface velocity and direction result file. The mathematical model of this invention is reasonably designed, highly applicable, and produces accurate calculations and results, improving work efficiency and saving costs.

The application discloses a method and device for establishing a near-surface velocity model, and belongs to the technical field of geophysical exploration. The method comprises the following steps: acquiring the positions of a plurality of shot points, the positions of a plurality of geophones, and the actual first arrival time corresponding to each shot-geophone pair; obtaining the isotropic near-surface velocity corresponding to each detection area based on the positions of the shot points, the positions of the geophones, the actual first arrival time corresponding to each shot-geophone pair and an initial near-surface velocity model; determining the predicted first arrival time corresponding to each shot-geophone pair based on the isotropic near-surface velocity; and determining the near-surface velocity corresponding to different directions in each detection area based on the isotropic near-surface velocity corresponding to each detection area, the predicted first arrival time corresponding to each shot-geophone pair and the actual first arrival time. The near-surface velocity determined by the method takes the speed difference of seismic waves propagating in the crust along different directions into account, and can more truly and accurately determine the near-surface velocity of seismic waves.

The application discloses a method for calculating near-surface anisotropy parameters, which comprises the following steps: after a near-surface velocity model is established, the average velocity of each micro-logging horizon is calculated, and the velocity of each horizon of the near-surface velocity model is calculated; then, the thickness of each micro-logging horizon and the thickness of the corresponding horizon of the near-surface velocity model are calculated; and finally, the near-surface anisotropy parameters are obtained. The application is used for calculating the near-surface anisotropy parameters, applied to forming a near-surface anisotropy parameter field, thereby reducing the error of the pre-stack depth migration result in depth caused by the near-surface anisotropy, and improving the imaging precision of the pre-stack depth migration.

The invention discloses a geological constraint velocity depth modeling method and device based on VSP velocity. According to the technical scheme, the method comprises the steps that first arrival pickup time, micro-logging data and logging data of a target work area are collected; performing micro-logging constraint step-by-step near-surface velocity inversion based on the first arrival pickup time and the micro-logging data to obtain a near-surface velocity model; establishing an initial velocity model of geological constraint based on VSP velocity based on the logging data; establishing a full-depth TTI anisotropic parameter model; and performing optimization based on the initial velocity model and the full-depth TTI anisotropy parameter model to obtain a geological constraint velocity depth model based on the VSP velocity. According to the technical scheme of the embodiment of the invention, the initial velocity model precision and the velocity depth model precision can be improved, the mountain front zone structure is accurately imaged, and the oil exploration risk is reduced.

The invention relates to a device (7) for measuring the surface velocity of a fluid (10) flowing in a confined space such as through a pipe or a channel (12), said device (7) comprising a patch antenna (1) with a transmitting area (1a) generating a microwave signal and a receiving area (1b) receiving the microwave signal reflected on the surface of the fluid (10), the device (7) being characterized in that it comprises an electrically conductive tube (8), called reflector tube, with at least the transmitting area (1a) of the patch antenna (1) mounted at one end (8a) of the reflector tube (8) to reduce the side lobes of the generated microwave signal. The invention also relates to the non-invasive method for measuring the surface velocity of the fluid using said device (7).

This invention belongs to the field of hydrological measurement technology and provides a method for calculating flow rate using surface velocity in edge computing devices. The method includes the following steps: S1, importing and storing a water level stratification velocity conversion parameter table into the edge computing device; S2, collecting real-time water level and real-time surface velocity, and calculating the cross-sectional water-passing area; S3, querying the water level stratification velocity conversion parameter table to obtain characteristic water levels, and reading the corresponding vertical lines and velocity conversion coefficients; S4, calculating the average velocity of the corresponding vertical lines based on the velocity conversion coefficients and real-time surface velocity, and calculating the average velocity of the river channel; S5, calculating the real-time flow rate of the river channel based on the average flow rate and the cross-sectional water-passing area. This invention is applicable to low-power edge computing devices in the field and can improve the accuracy of flow measurement in emergency river conditions.

This invention discloses a single-station UHF radar method for inverting surface velocity at river cross sections based on RAMPJI. The method includes acquiring radar echo data, dividing the observed flow field area into multiple equally spaced intervals according to the cross-sectional direction, estimating the main flow direction, back-projecting each radial velocity component to the main flow direction to construct a candidate set of velocity values ​​and eliminate outliers, then introducing a weighted fusion mechanism for each radial velocity angle pair within each partition to obtain stable observation values, and employing a Top-K strategy to weightedly fuse effective angle pairs to achieve cross-sectional surface velocity inversion. This invention achieves effective fusion of multi-angle radial velocity observation information and inversion of cross-sectional surface velocity. It can stably invert cross-sectional surface velocity under different environmental noise, different flow direction offsets, and missing measurement conditions. It maintains high inversion accuracy and spatial continuity in complex river environments, and its cross-sectional surface velocity results show good consistency with the velocity values ​​measured by an Acoustic Doppler Current Profiler (ADCP).