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Method, device and storage medium for extracting seismic source wavelet from marine seismic data

A technology of seismic data and source wavelets, applied in seismology, measuring devices, seismic signal processing, etc., can solve problems such as indistinguishable time domain

Active Publication Date: 2022-05-27
SUN YAT SEN UNIV
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Problems solved by technology

And because the wavelet usually has a certain time-continuation length, the direct wave and the subsequent source ghost wave are superimposed together, and cannot be distinguished in the time domain

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  • Method, device and storage medium for extracting seismic source wavelet from marine seismic data
  • Method, device and storage medium for extracting seismic source wavelet from marine seismic data
  • Method, device and storage medium for extracting seismic source wavelet from marine seismic data

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Embodiment Construction

[0054] In order to describe the technical content, structural features, achieved objects and effects of the present invention in detail, the following detailed description is given in conjunction with the embodiments and the accompanying drawings.

[0055] see image 3 As shown, the method for extracting source wavelets of marine seismic data in this embodiment is a method for extracting wavelets from marine seismic data based on direct waves, which is suitable for directly obtaining seismic source wavelets from superimposed signals of direct waves and source ghost waves. Wave.

[0056] The seismic source wavelet here is specifically that when the seismic wave propagates in the formation medium after excitation, the sharp excitation pulse waveform becomes a form with a certain duration and limited energy due to the effect of the earth filter. At this time, the earth is equivalent to a low-pass filter. , after the wide-band sharp pulse passes through the earth filter, the high...

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Abstract

The invention discloses a method, a device and a storage medium for extracting source wavelets of marine seismic data. The method includes: intercepting the direct wave window containing ghost waves from the observed marine seismic data to obtain superimposed signals W of each seismic channel. dg (t), the superimposed signal W dg (t) Contains the direct wave signal W of the current seismic trace d (t) and source ghost signal W g (t); the stacked signal W for any seismic trace dg (t) Perform frequency domain conversion to obtain the frequency domain superposition signal of the current seismic trace to calculate the time difference Δt between the ghost wave and the direct wave on the current seismic trace; calculate the different circular frequencies ω according to the time difference Δt between the ghost wave and the direct wave on the current seismic trace 1‑e corresponding to the current seismic trace ‑iωΔt The value of ; according to the frequency domain superposition signal of the current seismic trace and the corresponding 1‑e of the current seismic trace at different circular frequencies ω ‑iωΔt Calculate the frequency-domain direct wave signal of the current seismic trace, perform time-domain conversion on the frequency-domain direct wave signal of the current seismic trace, and obtain the seismic source wavelet W of the current seismic trace d (t); The present invention can directly obtain the seismic source wavelet from the superimposed signals of the direct wave and the ghost wave.

Description

technical field [0001] The invention relates to the technical field of seismic data processing, in particular to a method, device and storage medium for extracting source wavelets of marine seismic data. Background technique [0002] The extraction of wavelets plays an important role in marine seismic data processing. When the seismic wave propagates in the stratigraphic medium after excitation, the sharp excitation pulse waveform becomes a seismic source wavelet with a certain duration and limited energy due to the effect of ground filtering. In order to improve the resolution of seismic data, wavelet shaping and other processing are usually carried out according to the shape of the wavelet. In addition, the wavelet is also an important parameter in the marine seismic data processing stage such as data filtering, forward modeling and waveform inversion. It is premised that the shape of the wavelet is known. Therefore, extraction of seismic source wavelets from the observe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/32G01V1/36
CPCG01V1/325G01V1/362G01V1/364G01V2210/20G01V2210/40
Inventor 成谷
Owner SUN YAT SEN UNIV