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Full-waveform inversion method for mixed active and passive source seismic data in elastic media

A technology for full waveform inversion and seismic data, applied in seismology, seismic signal processing, geophysical measurement, etc., can solve the problems that have not been involved, mining elastic wave passive source multi-component data, etc., to achieve reliable results and avoid seismic sources Positioning and wavelet estimation problems, the effect of inversion process stabilization

Active Publication Date: 2020-01-17
JILIN UNIV
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Problems solved by technology

The prior art does not involve how to mine the low-frequency information of elastic wave passive source multi-component data and use it for full waveform inversion

Method used

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  • Full-waveform inversion method for mixed active and passive source seismic data in elastic media
  • Full-waveform inversion method for mixed active and passive source seismic data in elastic media
  • Full-waveform inversion method for mixed active and passive source seismic data in elastic media

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Embodiment 1

[0099] The overall process of the present invention is as figure 1 shown.

[0100] The real Vp (P-wave velocity) model adopted is as follows figure 2 As shown in a, the real Vs (shear wave velocity) model adopted is as follows figure 2 as shown in b. The initial Vp model adopted is as follows image 3 As shown in a, the initial Vs model adopted is shown in Fig. 3b. During the active source acquisition, the source shoots on the surface, the number of sources is 24, the first source on the left is located at x=50m, and the shot distance is 80m. The geophones are arranged within the range of 0m-1910m on the surface, a total of 192 geophones, and the distance between the geophones is 10m. The active source wavelet adopts the Reich wavelet with missing low frequency, such as Figure 4 shown. Figure 4 a is the wavelet after removing the low-frequency components below 9Hz from the Reich wavelet with a main frequency of 20Hz. Figure 4 b is the spectrum analysis ...

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Abstract

The invention relates to an elastic-medium active-source and passive-source mixed-collection seismic-data full-waveform inversion method. The method comprises the following steps of firstly, carryingout seismic interference processing on collected passive source elastic multi-component seismic data and acquiring four different modes of virtual gun multi-component records; then, dividing each twoof the different modes of virtual gun records into one group, and carrying out elastic-wave multi-component independent wavelet inversion; and finally, using a cross selection method, and using high-quality Vp and Vs macromodels as the initial models of missing low-frequency active-source elastic-wave multi-component full-waveform inversion so as to carry out inversion iteration. Through passive-source elastic multi-component seismic record and active-source seismic record serial processing, the low frequency missing series problems of the inversion can be overcome and accurate detail and deepportion construction information can be acquired, the macroscopic and detail construction information of longitudinal and transverse wave speed models can be well depicted, the cyclic skipping problem of the inversion is greatly alleviated, and finally, accurate macroscopic construction and accurate detail construction information are possessed.

Description

Technical field: [0001] The invention relates to a full-waveform inversion method of seismic data, in particular to a full-waveform inversion method of seismic data with elastic medium active source and passive source mixed acquisition. Background technique: [0002] In conventional seismic acquisition, passive source seismic signals are often ignored due to their weak energy and difficulty in extraction. In recent years, in-depth research on passive source seismic exploration methods has found that it has a series of advantages that conventional active source seismic exploration does not have. In order to describe the details of the subsurface medium and the information of the deep structure more accurately, it is necessary to make full use of the multi-source and multi-component wave field information received by the surface. The invention mainly utilizes the joint application of active source and passive source elastic wave multi-component seismic data to improve the acc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/282G01V1/307G01V2210/6222
Inventor 张盼韩立国邢贞贞胡勇
Owner JILIN UNIV
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