CN-121995435-A - Method, device and storage medium for determining shot point excitation time

CN121995435ACN 121995435 ACN121995435 ACN 121995435ACN-121995435-A

Abstract

The application provides a method, a device and a storage medium for determining shot point excitation time, and belongs to the field of seismic exploration. The method comprises the steps of determining first excitation time of each shot corresponding to the irregular shot layout, determining vibration time based on the preset distances among a plurality of source vessels in a target area and shot distances among adjacent shots, and obtaining actual excitation time of the shots based on the first excitation time and the vibration time, so that when the actual excitation time of the shots is determined, the method is not only based on the first excitation time of the irregular shot layout, but also considers the influence of the preset distances among the plurality of source vessels in the target area and shot distances among the adjacent shots on the excitation time, and accordingly improves the separation effect of the high-efficiency aliasing acquisition data of seismic exploration.

Inventors

ZHU XUJIANG
WANG XINQUAN
LI YAXIN
MA ZHU
WANG WEI
ZHANG HONGTAO

Assignees

中国石油天然气集团有限公司
中国石油集团东方地球物理勘探有限责任公司

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (10)

1. A method of determining shot firing time, the method comprising: For each shot in a target area, acquiring a first excitation time of the shot, wherein the first excitation time is used for generating an irregular shot layout; Determining the vibration time based on the distance between a plurality of source boats preset in the target area and the shot point distance between the shot point and the shot point adjacent to the shot point before the shot point; and obtaining the actual excitation time of the shot point based on the first excitation time of the shot point and the trembling time of the shot point.
2. The method of claim 1, wherein the obtaining a first firing time of the shot comprising: Determining the first excitation time of the shot point according to a preset random algorithm, or And determining a first excitation time of the shot based on a preset shot offset distance and the speed of the source ship, wherein the preset shot offset distance is the distance between the shot and the shot in a preset regular shot.
3. The method of claim 2, wherein the determining the first firing time of the shot based on the preset shot offset distance and the travel speed of the source vessel comprises: dividing the shot offset distance by the running speed to obtain the second excitation time; and obtaining the first excitation time based on the preset excitation time difference between the adjacent shots and the second excitation time.
4. The method of claim 2, wherein the determining the first firing time of the shot point according to a predetermined random algorithm comprises: Acquiring an excitation time difference between preset adjacent shots, wherein the excitation time difference is determined based on preset distances between preset regular shots; and correcting the excitation time difference according to a preset random algorithm to obtain the first excitation time.
5. The method of claim 1, wherein the determining the tremor time based on a distance between a plurality of source boats preset in the target area, a shot distance between the shot and a shot immediately preceding the shot, comprises: selecting the maximum distance from the distances among the plurality of source ships as the maximum synchronous distance corresponding to the plurality of source ships; obtaining a time threshold corresponding to the preset random time set based on the maximum synchronous distance, the maximum random time in the preset random time set and the preset minimum synchronous excitation distance; The tremor time is determined based on the time threshold, the minimum synchronized firing distance, and the shot distance.
6. The method of claim 5, wherein the determining the tremor time based on the time threshold, the minimum synchronized firing distance, and the shot distance comprises: judging whether the shot point distance is larger than the minimum synchronous excitation distance, if so, selecting any random time which is not larger than the time threshold from the random time set as the trembling time; If not, selecting any random time greater than the time threshold from the random time set as the dithering time.
7. An apparatus for determining shot firing time, the apparatus comprising: the acquisition module is used for acquiring first excitation time of the shot points aiming at each shot point in the target area, wherein the first excitation time is used for generating an irregular shot point layout; The first determining module is used for determining the trembling time based on the distance between a plurality of preset source boats in the target area and the shot point distance between the shot point and the shot point adjacent to the shot point before the shot point; And the second determining module is used for obtaining the actual excitation time of the shot point based on the first excitation time of the shot point and the trembling time of the shot point.
8. The apparatus of claim 7, wherein the acquisition module comprises: A first determining unit for determining a first excitation time of the shot point according to a preset random algorithm, or And the second determining unit is used for determining the first excitation time of the shot point based on a preset shot point offset distance and the speed of the source ship, wherein the preset shot point offset distance is the distance between the shot point and the shot point in a preset regular shot point.
9. A computer device comprising one or more processors and one or more memories, the one or more memories having stored therein at least one instruction loaded and executed by the one or more processors to perform the operations performed by the method of determining shot firing time of any of claims 1 to 6.
10. A storage medium having stored therein at least one instruction loaded and executed by a processor to perform the operations performed by the method of determining shot firing time of any one of claims 1 to 6.

Description

Method, device and storage medium for determining shot point excitation time Technical Field The application relates to the technical field of seismic exploration, in particular to a method, a device and a storage medium for determining shot point excitation time. Background With the development of marine/land seismic exploration, multi-source seismic exploration techniques are also widely used. When the seismic exploration technology of multiple seismic sources is utilized to conduct seismic exploration on the ocean, a target area for conducting seismic exploration needs to be determined, a plurality of equidistant cannon lines are arranged in the target area, and a plurality of cannons are equidistantly arranged on each cannon line, so that a regular cannon point layout is formed. In the regular shot layout, each shot line corresponds to at least one preset source ship, and when the source ship sequentially passes through shots on the shot lines along the shot lines, the source ship can excite the source every time the positions corresponding to the shots are reached, so that seismic data are generated. Because a plurality of seismic sources can be excited simultaneously in an exploration area, the seismic data generated by different seismic sources corresponding to the same moment can be aliased, and accordingly the arranged detectors can receive the aliased seismic data generated by the plurality of seismic sources. And when the subsequent data is processed, separating the aliased seismic data by using an aliased data separation method to obtain separation data corresponding to the positions of all the shots. In the related art, in order to obtain separated seismic data through aliasing seismic data, the excitation time intervals between adjacent shots on each shot line in a regular shot layout are determined, then the randomly generated time is utilized to correct the corresponding excitation time intervals when the seismic source is excited at each shot, so that the excitation time of the seismic source presents the characteristic of random distribution to reduce the interference among the seismic sources, and the later use of the aliasing seismic data to obtain the separated seismic data is facilitated. However, the above-mentioned determination of the excitation time interval of the seismic source is based on the random time of the regular shot layout, and does not consider the influence of other parameters, which results in inaccurate excitation time for exciting the shot, and is not beneficial to the separation of the high-efficiency aliasing acquired data of the seismic exploration. Disclosure of Invention The embodiment of the application provides a method, a device and a storage medium for determining shot point excitation time, which can improve the separation effect of high-efficiency aliasing acquisition data of seismic exploration. The technical scheme is as follows: in one aspect, a method of determining shot firing time is provided, the method comprising: For each shot in a target area, acquiring a first excitation time of the shot, wherein the first excitation time is used for generating an irregular shot layout; The method comprises the steps of determining the vibration time based on the distance between a plurality of source boats preset in a target area and the shot point distance between the shot point and the shot point adjacent to the shot point, wherein the distance between the plurality of source boats is the distance between every two source boats in the driving process of the plurality of source boats in the target area, and obtaining the actual excitation time of the shot point based on the first excitation time of the shot point and the vibration time of the shot point. Optionally, the acquiring the first excitation time of the shot point includes: Determining the first excitation time of the shot point according to a preset random algorithm, or And determining a first excitation time of the shot based on a preset shot offset distance and the speed of the source ship, wherein the preset shot offset distance is the distance between the shot and the shot in a preset regular shot. Optionally, the determining the first excitation time of the shot point based on the preset shot point offset distance and the running speed of the source ship includes: dividing the shot offset distance by the running speed to obtain the second excitation time; and obtaining the first excitation time based on the preset excitation time difference between the adjacent shots and the second excitation time. Optionally, the determining the first excitation time of the shot point according to a preset random algorithm includes: Acquiring an excitation time difference between preset adjacent shots, wherein the excitation time difference is determined based on preset distances between preset regular shots; And correcting the excitation time difference according to a preset random algorithm to obtain the fir