粘弹介质勒夫波频散曲线研究及应用

doi:10.11720/wtyht.2020.1386

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Abstract

At present,the geological situation of seismic exploration is becoming more and more complicated.With the continuous development of seismic exploration,especially for viscoelastic media,the technical requirements for surface wave exploration are getting higher and higher.Love wave refers to the horizontal polarization shear wave in the surface layer after repeated reflections at the boundary of the surface layer.Love wave detection is one of the shallow surface detection method.It is very convenient and has high detection precision.Therefore,the study of Love wave has important theoretical and practical significance.In this paper,the Love wave single shot record is simulated by high order finite difference method in the case of horizontal layered complex geological.The comparison of the dispersion curves with the theoretical dispersion curves proves that the method proposed in this paper is correct.The influence of the viscoelastic medium on the Love wave dispersion curve is also discussed.Then,the least squares inversion is used to verify this conclusion.This paper provides a more complete theoretical basis for the high-precision surface wave inversion method.Finally,the field data inversion results show that the proposed method is effective and practicable.

Key words： viscoelastic media Love wave dispersion curve

Received: 27 July 2019 Published: 24 June 2020

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	Articles by authors
	Bao-Wei ZHANG
	Jin DONG
	Hua WU

Cite this article:

Bao-Wei ZHANG,Jin DONG,Hua WU. A study of dispersion curves of Love waves in viscoelastic media and their application[J]. Geophysical and Geochemical Exploration, 2020, 44(3): 599-606.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1386 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I3/599

Horizontal uniform medium model

Three-layered model of increasing velocity

Comparison of the wave field record (horizontal component) for completely elastic medium and viscoelastic medium(Q=50、Q=20)
a—completely elastic medium;b—viscoelastic medium with Q=50;c—viscoelastic medium with Q=20

Comparison of single trace (horizontal component) waveform for completely elastic medium and viscoelastic medium(Q=50、Q=20)
a—waveform comparison of the 25^th trace;b—waveform comparison of the 48^th trace

Comparison of theoretical dispersion curve and the dispersion energy in single shot record for completely elastic medium and viscoelastic medium
a—completely elastic medium;b—viscoelastic medium with Q=50;c—viscoelastic medium with Q=20

Comparison of theoretical dispersion curves for completely elastic medium and viscoelastic medium

Shear wave velocity inversion results of theoretical dispersion curves

Field test scenario

The first shot of field Love-wave record(a) and its dispersion curves(b)

2-D shear wave velocity profile from the dispersion curve inversion of field data

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