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Extrapolation method of seismic data first arrival waves

A technology of seismic data and pushing method, which is applied in seismology, seismic signal processing, geophysical measurement, etc., can solve the problem of low accuracy of first-arrival picking, and achieve the effect of increasing quantity, good technical value, and easy picking

Active Publication Date: 2020-08-14
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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  • Extrapolation method of seismic data first arrival waves
  • Extrapolation method of seismic data first arrival waves
  • Extrapolation method of seismic data first arrival waves

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Embodiment Construction

[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 invention provides an extrapolation method of seismic data first arrival waves. The method comprises the steps of firstly, arranging a time window around a first arrival wave of a shot gather; secondly, carrying out deconvolution and superposition on the wave fields of the reference channel and the target channel in a shot domain to form a virtual wave field; thirdly, subjecting the referencechannel wave field and the virtual wave field to convolution and superposition in a detection point domain to obtain a super virtual first arrival wave; judging whether loop iteration is adopted or not; in addition, carrying out first arrival wave extrapolation, and the target channel being located outside the detector arrangement of the target shot gather; then, sequentially carrying out deconvolution superposition and convolution superposition in a shot domain and a detection point domain to obtain extrapolated super virtual first arrival waves; and judging whether loop iteration is adoptedor not. According to the method, the energy of the first arrival waves can be effectively enhanced, the signal-to-noise ratio of the first arrival waves is improved, meanwhile, the data volume of theavailable first arrival waves is greatly increased through extrapolation of the first arrival waves, richer information is provided for subsequent seismic data processing, and the method can be wellapplied to seismic data collected 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 Applications(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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