Rapid coding and sorting-free datum plane correction method and system

Abstract

The invention discloses a rapid coding and sorting-free datum plane correction method and system. The method comprises the following steps of 1, obtaining a near-surface velocity model, and determining a wave field continuation range according to an inverted ray density; 2, in the wave field continuation range, reading all common shot seismic data to obtain a plurality of initial common shot gathers; 3, for the initial common shot gathers, extending receiver points to a top interface of a high-velocity layer and upwards to a datum plane according to a replacement velocity to obtain a common receiver point gather; and 4, for the common receiver point gather, extending shot points to the top interface of the high-velocity layer and upwards to the datum plane according to the replacement velocity to obtain a final common shot gather. According to the method and system, wave field continuation is performed on the seismic data, so that the problem of near-surface correction under a complexnear-surface condition is solved, reflection distortion can be eliminated, ideal data can be provided for subsequent seismic data processing, and the parallel computing efficiency of the shot and receiver point gathers can be enhanced through a continuation computing queue technology.

Description

technical field [0001] The present invention relates to the field of geophysical prospecting, and more particularly, to a method and system for correcting a fast-coding, sorting-free datum plane. Background technique [0002] In reflection wave seismic exploration, processing methods such as pre-stack denoising and velocity analysis are based on the assumption of horizontal surface and horizontal layered near-surface conditions. The near-surface problem is solved by conventional static correction technology, and the geometry of the reflected wave is restored. However, for complex near-surface conditions, such as severe undulations and low-velocity zones with strong lateral changes, the assumption of surface consistency is often unsatisfactory. For example, the impact of the surface on the same location varies with the propagation paths of seismic waves. , this problem cannot be solved by two-way transit time difference correction. At this time, the conventional static corre...

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Problems solved by technology

[0008] The present invention proposes a fast coding-free sorting datum level correction method and system, which can extend the data on the datum plane by performing wave field continuation on seismic data, and solve the problem of near-surface correction in complex near-surface conditions , eliminate reflection distortion, restore geometric form, provide ideal data for subsequent seismic data processing, and improve the parallel computing efficiency of shot and check point gathers through continuation computing queue technology

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