CN-122017997-A - Resolution acquisition method, device, equipment and readable storage medium

CN122017997ACN 122017997 ACN122017997 ACN 122017997ACN-122017997-A

Abstract

The application provides a resolution acquisition method, a device, equipment and a readable storage medium, wherein the resolution acquisition method comprises the steps of determining a focus CFP gather and a detector CFP gather based on Gaussian beams, determining focus beams corresponding to the focus CFP gather, determining detector focus beams corresponding to the detector CFP gather, determining dual focus beams corresponding to the focus beams and the detector focus beams based on the focus beams and the detector focus beams, and acquiring first resolution and second resolution of the dual focus beams based on the dual focus beams, wherein the first resolution is the resolution of the dual focus beams in a first preset direction, the second resolution is the resolution of the dual focus beams in a second preset direction, and determining the dual focus beams corresponding to the focus beams and the detector focus beams based on the Gaussian beams.

Inventors

HUANG FUQIANG
MAO RUIQIANG
ZHAO XUWEI
HU BIN
Han Suolong
LI KE

Assignees

中石化石油工程技术服务股份有限公司
中石化海洋石油工程有限公司

Dates

Publication Date: 20260512
Application Date: 20241111

Claims (10)

1. A resolution acquisition method applied to a submarine node seismic observation system, the method comprising: determining a focus CFP gather and a detector CFP gather based on the Gaussian beam; Determining a focus beam corresponding to the focus CFP gather; Determining a detection focusing beam corresponding to the detection point CFP gather; determining dual-focus beams corresponding to the focus focusing beam and the detection focusing beam based on the focus focusing beam and the detection focusing beam; Based on the dual-focusing beam, a first resolution and a second resolution of the dual-focusing beam are obtained, wherein the first resolution is the resolution of the dual-focusing beam in a first preset direction, and the second resolution is the resolution of the dual-focusing beam in a second preset direction.
2. The resolution acquisition method of claim 1, wherein prior to determining the source CFP gather, the method further comprises: Acquiring an observation system and a three-dimensional geological model applied to the observation system; reading arrangement modes and coordinate information of shot points on the observation system, and reading arrangement modes and coordinate information of detection points; Determining a target layer to be observed and a target point in the target layer in the three-dimensional geological model; And performing double-focus analysis on the target point based on the arrangement mode and the coordinate information of the shot point and the detection point, and determining the resolution of the observation system at the target point.
3. The resolution acquisition method according to claim 1, wherein the determining a source CFP gather based on gaussian beams comprises: determining the ray path, travel time and the amplitude of the central ray from all rays from the target point to each source; determining the energy Gaussian distribution when each ray propagates to the plane of the receiving point; Screening the rays, and determining the rays with the distance between the rays reaching the plane of the receiving point and the receiving point within the range of a preset half width as rays to be overlapped; And carrying out Gaussian weighted superposition on the rays to be superimposed based on the ray paths, the travel time and the amplitudes of the central rays to obtain the focus CFP gather.
4. The resolution acquisition method according to claim 2, wherein the determining the detection focused beam corresponding to the detection point CFP gather includes: S41, dividing the target layer into a plurality of search grid points according to the CMP surface element; S42, sequentially taking each searching grid point as an excitation point; S43, carrying out Gaussian beam forward modeling on the excitation point to obtain the travel time of an ith detector corresponding to the excitation point, wherein i is a positive integer; S44, if the ray of the ith detector is within the integral aperture range of the searching grid point corresponding to the excitation point, starting from the travel time, cutting out waveforms according to wavelet length on the trace set corresponding to the ith detector in the detector CFP trace set; s45, sequentially executing the steps S43 to S44 on the rest detectors to respectively obtain the waveforms corresponding to the detectors; S46, performing superposition operation on all the waveforms to obtain imaging channels of the search grid points corresponding to the excitation points; s47, sequentially determining offset apertures of each detector to the target layer imaging according to all detector arrays, wherein the offset apertures are used for limiting a searching range of searching grid points; s48, sequentially executing the steps S42 to S47 on the rest searching grid points to respectively obtain the imaging channels corresponding to each searching grid point; s49, determining the superposition energy of all the imaging channels, and normalizing the superposition energy to obtain the detection focusing beam.
5. The resolution acquisition method according to claim 1, wherein the determining a dual focus beam corresponding to the source focus beam and the detector focus beam based on the source focus beam and the detector focus beam includes: performing product operation on the focus focusing beam and the detection focusing beam corresponding to the focus focusing beam to obtain a sub-dual focusing beam; sequentially performing the product operation on the rest focus beams and the detection focus beams corresponding to the focus beams to respectively obtain the rest focus beams and the sub-double focus beams corresponding to the detection focus beams corresponding to the focus beams; and summing all the sub double focusing beams to obtain the double focusing beams.
6. The resolution acquisition method according to claim 1, wherein acquiring the first resolution of the dual focus beam includes: extracting a first resolution curve corresponding to the dual-focusing beam in the first preset direction; And acquiring the first resolution based on the first resolution curve.
7. The resolution obtaining method according to claim 6, wherein the obtaining the first resolution based on the first resolution curve includes: Determining focusing main energy width information at a preset position of a main lobe peak value on the first resolution curve; determining the first resolution of the dual focused beam in the first preset direction based on the focused primary energy width information.
8. A resolution acquisition device, the device comprising: the gather determining module is used for determining a focus CFP gather and a detector CFP gather based on the Gaussian beam; the focus beam determining module is used for determining focus beams corresponding to the focus CFP gathers; the detection focusing beam determining module is used for determining detection focusing beams corresponding to the detection point CFP gathers; The dual-focusing-beam determining module is used for determining dual focusing beams corresponding to the focus focusing beam and the detection focusing beam based on the focus focusing beam and the detection focusing beam; The resolution acquisition module is used for acquiring a first resolution and a second resolution of the dual-focusing beam based on the dual-focusing beam, wherein the first resolution is the resolution of the dual-focusing beam in a first preset direction, and the second resolution is the resolution of the dual-focusing beam in a second preset direction.
9. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the resolution acquisition method of any one of claims 1 to 7.
10. An electronic device, the electronic device comprising: A memory storing a computer program; A processor, in communication with the memory, which executes the resolution acquisition method of any one of claims 1 to 7 when the computer program is invoked.

Description

Resolution acquisition method, device, equipment and readable storage medium Technical Field The application belongs to the technical field of submarine node seismic data acquisition, relates to a resolution acquisition method, and in particular relates to a resolution acquisition method, a device, equipment and a readable storage medium. Background In the process of acquiring data of a submarine node seismic observation system (Ocean Bottom Node, OBN), the dual-focusing beam technology is an effective method for improving the resolution and the signal-to-noise ratio of seismic imaging. However, the implementation of dual focused beams faces a series of technical challenges due to the complexity of the subsea environment and the limitations of the node seismic instrumentation itself. Therefore, how to simplify the implementation process of the dual-focusing beam and improve the resolution obtaining efficiency and accuracy has become one of the technical problems that the related technicians need to solve. Disclosure of Invention The application provides a resolution acquisition method, a resolution acquisition device, resolution acquisition equipment and a readable storage medium, which are used for solving the technical problems that a submarine node seismic observation system in the prior art lacks a mature dual-focusing beam realization process and a resolution acquisition method. In a first aspect, an embodiment of the application provides a resolution obtaining method, which comprises the steps of determining a focus beam corresponding to a focus CFP gather and a detector CFP gather based on Gaussian beams, determining a detector focus beam corresponding to the detector CFP gather, determining a dual focus beam corresponding to the focus beam and the detector focus beam based on the focus beam and the detector focus beam, and obtaining a first resolution and a second resolution of the dual focus beam based on the dual focus beam, wherein the first resolution is the resolution of the dual focus beam in a first preset direction, and the second resolution is the resolution of the dual focus beam in a second preset direction. In one implementation manner of the first aspect, before determining the focus CFP gather, the method further includes acquiring an observation system and a three-dimensional geologic model applied to the observation system, reading arrangement mode and coordinate information of shot points on the observation system, reading arrangement mode and coordinate information of detection points, determining a target layer to be observed and a target point in the target layer in the three-dimensional geologic model, and performing double-focus analysis on the target point based on the arrangement mode and the coordinate information of the shot points and the detection points to determine resolution of the observation system at the target point. In one implementation manner of the first aspect, the determining a focus CFP gather based on the gaussian beam includes determining ray paths, amplitudes of travel time and central rays of all rays from the target point to each focus, determining energy gaussian distribution when each ray propagates to a receiving point plane, performing screening operation on the rays, determining the rays with the distance between the rays and the receiving point in a preset half-width range on the receiving point plane as rays to be overlapped, and performing gaussian weighted overlapping on the rays to be overlapped based on the ray paths, the amplitudes of travel time and the central rays to obtain the focus CFP gather. In one implementation manner of the first aspect, the determining the detection focusing beam corresponding to the detection point CFP gather includes dividing the target layer into a plurality of search grid points according to CMP bins, S42 sequentially taking each search grid point as an excitation point, S43 performing gaussian beam forward modeling on the excitation point to obtain travel time of an ith detector corresponding to the excitation point, wherein i is a positive integer, S44 if rays of the ith detector are within an integral aperture range of the search grid point corresponding to the excitation point, intercepting waveforms on a gather corresponding to the ith detector in the detection point CFP gather according to wavelet lengths from the travel time, S45 sequentially performing the steps S43 to S44 on the remaining detectors to obtain waveforms corresponding to each of the detectors, S46 performing superposition operation on all the waveforms to obtain imaging tracks of the search grid point corresponding to the excitation point, S47 sequentially determining the positions of the search grid point according to the range of the search grid point, S48 sequentially performing the superposition operation on all the search grid point, and sequentially performing the step S45 to obtain the images of the focus point, and sequentially d