绕射波与一次波联合黏声最小二乘逆时偏移

doi:10.11720/wtyht.2023.2636

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Abstract

Poor illumination poses great challenges to the imaging of small-scale faults and pores.Subsurface attenuation leads to amplitude loss and phase distortion of seismic waves,and ignoring such attenuation during imaging will blur migration amplitudes.The Q-compensated least-squares reverse time migration (QLSRTM) can improve the imaging of these small-scale structures,but it requires a huge amount of iterations and computational cost.To improve the imaging effect of these small-scale structures,this study proposed a geological-target-oriented joint QLSRTM (J-QLSRTM) that fully utilizes diffracted waves.In this method,a new objective function and gradient formula was constructed.Moreover,the Q-compensated wavefield propagation operators,Q-compensated adjoint operators,and Q-attenuated demigration operators were derived for both primary and diffracted waves based on the inversion and adjoint theories.The numerical examples verified that the proposed J-QLSRTM is superior to the conventional QLSRTM and the acoustic J-LSRTM.

Key words： least-squares reverse time migration viscoacoustic diffracted waves

Received: 11 December 2021 Published: 24 February 2023

ZTFLH:

P631.4

Corresponding Authors: QU Ying-Ming E-mail: quyingming@upc.edu.cn

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	Articles by authors
	Lei-Liang XU
	Guo-Yong ZHAO
	Jian ZHANG
	Tian-Miao ZHONG
	Jia-Ying GU
	Jian YOU
	Ying-Ming QU

Cite this article:

Lei-Liang XU,Guo-Yong ZHAO,Jian ZHANG, et al. Joint Q-compensated least-squares reverse time migration using primary and diffracted waves[J]. Geophysical and Geochemical Exploration, 2023, 47(1): 91-98.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.2636 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I1/91

Three layer attenuation model with small-scale caves

The shot records from the viscoelastic medium(a), acoustic medium(b),and the shot records of diffracted waves separated from the attenuating shot records(c) and separated reflected waves by cutting off the direct wave(d)

Wave field compensation test with 600 ms

The attenuating Sigsbee2B velocity model(a)and Q model(b)

Shot record(a),separated diffractive wave shot records(b) and separated primary wave shot records(c)

Images of the Sigsbee2B model after Laplacian filtering from QRTM(a) and noncompensated RTM(b)

The imaging results after 30 iterations using the proposed J-QLSRTM(a) and the conventional QLSRTM(b) and prism wave(c)

The reflectivity(a) and acoustic LSRTM image using acoustic data(b)

Wavenumber spectra at the distance of 4 500 m

Velocity field(a) and Q field(b) with obvious errors

Fig.10a(a) and by using the Q field in Fig.10b(b)
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J-QLSRTM imaging results obtained by using the velocity field in Fig.10a(a) and by using the Q field in Fig.10b(b)

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