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A Method of Extrapolation of First Arrivals of Seismic Data

A technology of seismic data and inference method, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve the problem of low picking accuracy at the beginning, and achieve the effect of increasing the number, easy picking, and good technical value

Active Publication Date: 2021-05-25
JILIN UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide an effective technical means for improving the signal-to-noise ratio of first arrivals and extrapolating first arrivals. The first arrival wave of the first arrival provides richer information for the tomographic inversion of the first arrival travel time, so as to establish a more refined velocity model

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  • A Method of Extrapolation of First Arrivals of Seismic Data
  • A Method of Extrapolation of First Arrivals of Seismic Data
  • A Method of Extrapolation of First Arrivals of Seismic Data

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[0035] The present invention will be described in more detail below with reference to the accompanying drawings.

[0036] An extrapolation method for first arrivals of seismic data, for figure 1 The complex undulating surface geological model shown in the case recorded figure 2 The low signal-to-noise ratio seismic shot data in , including the following steps:

[0037] (1) Set a time window around the first arrivals of the original shot set, and intercept the wave field containing the first arrivals.

[0038] The time window length is two to three periods containing the expected first arrival.

[0039] (2) For the target shot whose seismic source is located at X, take the reference trace G(A|X) and the target trace G(B|X), G(A|X) represents the wave field recorded at the geophone A with the seismic source located at X , in the Fourier domain, ignoring the amplitude term, it can be expressed as where ω is the angular frequency, τ XA Represents the travel time of the firs...

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Abstract

The patent of the present invention proposes an extrapolation method for first arrival waves of seismic data. Firstly, a time window is set around the first arrival wave of the shot set; secondly, the wave fields of the reference trace and the target trace are deconvoluted and superimposed in the shot domain to form a virtual wave field; thirdly, the wave field of the reference trace and the virtual wave field are combined The field is convolved and superimposed in the detector point domain to obtain the super virtual first arrival wave; from the second time, it is judged whether to use cyclic iteration; in addition, the first arrival wave is extrapolated, and the target trace is located between the detector arrays of the target shot set Then, deconvolution stacking and convolution stacking are performed in the shot domain and receiver point domain in turn to obtain the extrapolated super virtual first arrival wave; after that, it is judged whether to use cyclic iteration. The invention can effectively enhance the energy of the first arrival wave, improve the signal-to-noise ratio of the first arrival wave, and at the same time greatly increase the amount of available first arrival wave data through extrapolation of the first arrival wave, provide more abundant information for subsequent seismic data processing, and can be well It is used for seismic data acquired under complex near-surface conditions.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration seismic data processing, in particular to a seismic data first-arrival extrapolation method with strong noise resistance. Background technique [0002] The seismic wave velocity parameter is an extremely important physical parameter in seismic exploration, which plays a vital role in all aspects of seismic exploration. It not only provides the main basis for seismic data processing and interpretation, but also indirectly reflects the structure of the underground medium. and lithology information. Therefore, how to accurately obtain the velocity information of the underground medium has always been a hot issue in the field of seismic exploration. [0003] First-arrival travel-time tomographic inversion is a stable, accurate and efficient velocity modeling method. Based on ray theory, it uses the travel-time information of first-arrival waves to invert the velocity and interface mor...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
CPCG01V1/305G01V2210/41G01V2210/53
Inventor 许卓张凤蛟韩立国
Owner JILIN UNIV
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