Surface wave prospecting method for jointly extracting Rayleigh wave frequency dispersion characteristics by seismoelectric field

Patent metadata

Field	Value
Publication number	US-11754744-B2
Application number	US-202017420928-A
Country	US
Kind code	B2
Filing date	Mar 4, 2020
Priority date	Mar 4, 2020
Publication date	Sep 12, 2023
Grant date	Sep 12, 2023

Abstract

A surface wave prospecting method for jointly extracting Rayleigh wave frequency dispersion characteristics in a seismoelectric field. A surface wave prospecting method includes following steps of: acquiring jointly acquired data, where the jointly acquired data includes seismic wave data and electric field data; carrying out jointly imaging processing on jointly acquired data to obtain a superposed frequency dispersion spectrum; carrying out extraction processing on superposed frequency dispersion spectrum to obtain a frequency dispersion curve, outperforming inversion processing on frequency dispersion curve to obtain a stratum structure profile. As seismic wave data and electric field data are adopted to carry out combined imaging processing to obtain superposed frequency dispersion spectrum, multi-mode frequency dispersion curve is extracted, multiplicity of solutions of inversion is greatly reduced during inversion, precision and stability of surface wave prospecting are greatly improved.

First claim

What is claimed is:

1. A method comprising:
acquiring a plurality of jointly collected data, wherein the plurality of jointly collected data comprises seismic wave data that comprises a seismic wave component and electric field data that comprises an electric field component;
performing a jointly imaging processing onto the plurality of jointly collected data by obtaining a dispersion spectrum of the seismic wave component and a dispersion spectrum of the electric field component according to the seismic wave component and the electric field component, respectively, and superposing the dispersion spectrum of the seismic wave component and the dispersion spectrum of the electric field component to obtain a superposed dispersion spectrum;
performing an extraction processing onto the superposed dispersion spectrum to obtain a dispersion curve; and
performing an inversion processing onto the dispersion curve to obtain a stratum structure profile.

2. The method according to claim 1 , wherein the obtaining of the dispersion spectrum of the seismic wave component and the dispersion spectrum of the electric field component according to the seismic wave component and the electric field component, respectively, further comprises:
extracting respectively an imaginary part of the seismic wave component and an imaginary part of the electric field component, before performing a frequency scanning to obtain the dispersion spectrum of the seismic wave component and the dispersion spectrum of the electric field component.

3. The method according to claim 1 , wherein the seismic wave component further comprises:
a seismic wave radial component and/or a seismic wave vertical component; and the electric field component comprises:
an electric field radial component and/or an electric field vertical component.

4. The method according to claim 3 , wherein the superposing of the dispersion spectrum of the seismic wave component and the dispersion spectrum of the electric field component to obtain the superposed dispersion spectrum, further comprises:
superposing the dispersion spectrum of the seismic wave vertical component and the dispersion spectrum of the electric field radial component to obtain the superposed dispersion spectrum; or
superposing the dispersion spectrum of the seismic wave radial component and the dispersion spectrum of the electric field radial component to obtain the superposed dispersion spectrum; or
superposing the dispersion spectrum of the seismic wave vertical component, the dispersion spectrum of the seismic wave radial component and the dispersion spectrum of the electric field radial component to obtain the superposed dispersion spectrum.

5. The method according to claim 1 , wherein the performing of the extraction processing onto the superposed dispersion spectrum to obtain the dispersion curve, further comprises:
extracting the superposed dispersion spectrum by an energy maximum to obtain the dispersion curve.

6. The method according to claim 1 , wherein performing of the inversion processing onto the dispersion curve to obtain the stratum structure profile, further comprises:
establishing an initial inversion stratum model, and
using a plurality of inversion methods to fit the dispersion curve to obtain the stratum structure profile; and the inversion methods comprise at least one of: a genetic algorithm, a swarm algorithm, and a quasi-Newton algorithm.

7. A device comprising:
a collection device configured to acquire the plurality of jointly collected data, wherein the plurality of jointly collected data comprises: a seismic wave data and an electric field data;
a jointly imaging device configured to perform a jointly imaging processing onto the jointly collected data by obtaining a dispersion spectrum of the seismic wave component and a dispersion spectrum of the electric field component according to the seismic wave component and the electric field component, respectively, and superposing the dispersion spectrum of the seismic wave component and the dispersion spectrum of the electric field component to obtain a superposed dispersion spectrum; and
an inversion device configured to perform the extraction processing onto the superposed dispersion spectrum to obtain the dispersion curve and perform the inversion processing onto the dispersion curve to obtain the stratum structure profile.

Assignees

• Univ Southern Sci & Tech

Inventors

• Ren Hengxin
• Yang Zhentao
• Chen Xiaofei
• Yuan Shichuan
• Zheng Xuzhen
• He Zhanxiang

Classifications

• G01V1/282 Primary

  Application of seismic models, synthetic seismograms · CPC title

• G01V11/007 Primary

  using the seismo-electric effect · CPC title

• G01V2210/614

  Synthetically generated data · CPC title

• G01V1/303

  for determining velocity profiles or travel times · CPC title

• G01V3/082

  operating with fields produced by spontaneous potentials, e.g. electrochemical or produced by telluric currents (G01V3/26 takes precedence) · CPC title