倾斜横向各向同性介质的弹性全波形反演:考虑对称轴倾斜角的多步骤策略

IF 1.8 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geophysical Prospecting Pub Date : 2024-07-29 DOI:10.1111/1365-2478.13578
Hengli Song, Yuzhu Liu, Jizhong Yang
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引用次数: 0

摘要

由于构造运动和矿物取向,具有倾斜对称轴(TTI)的横向各向同性介质广泛存在于地下。基于各向同性介质或具有垂直对称轴(VTI)的横向各向同性介质的传统全波形反演(FWI)无法处理这种情况。为解决这一限制,开发了基于 TTI 的全波形反演。然而,其实际应用在估计对称轴倾斜角方面面临挑战。以往的研究一般假定对称轴倾角等于地层倾角,这在盐穹隆和岩浆侵入带等复杂结构中是不正确的。另一种理论上稳健的估算方法是将其作为需要反演的参数,但仍有一些问题尚未解决。首先,该参数增加了反演过程的非线性,其对反演的影响机制尚不明确。其次,参数之间存在严重的串扰(也称权衡或耦合),但目前基于 TTI 的全波反演的参数解耦技术还不成熟。为了解决第一个问题,我们通过分析 TTI 背景中的辐射模式来评估参数与其他参数之间的相互作用。我们的分析表明,S 波垂直速度 、 和 对各向异性参数和 的影响最大。因此,我们得出结论,速度参数的良好反演是恢复 、 和 的先决条件,只有在恢复 、 和 之后才能恢复 。这一结论为解决第二个问题提供了一个自然的视角。因此,我们提出了一种多步骤、多参数的联合反演策略,以逐步提高参数反演的质量并削弱它们之间的耦合。数值实验证明,与之前提出的多参数反演策略相比,我们的策略能获得更精确的反演结果。最后,在南海野外 OBN 数据集上的应用验证了我们方法的实用性。
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Elastic full waveform inversion for tilted transverse isotropic media: A multi-step strategy accounting for a symmetry axis tilt angle

Transversely isotropic media with a tilted symmetry axis (TTI) exits widely underground due to tectonic movement and mineral orientation. Traditional full waveform inversion (FWI) based on isotropic media or transversely isotropic media with a vertical symmetry axis (VTI) cannot deal with such situations. To address this limitation, TTI–based FWI was developed. However, its practical application faces challenges in estimating the symmetry axis tilt angle θ t ${{\theta }_{\mathrm{t}}}$ . Previous studies have generally assumed that θ t ${{\theta }_{\mathrm{t}}}$ is equal to the strata dip angle, which is incorrect in complex structures such as salt domes and magmatic intrusion zones. Another theoretically robust way to estimate θ t ${{\theta }_{\mathrm{t}}}$ is to treat it as the parameter to be inverted, but there are still some problems unresolved. First, the parameter θ t ${{\theta }_{\mathrm{t}}}$ increases the nonlinearity of the inversion process, and its impact mechanism on inversion is not yet clear. Second, there is severe crosstalk (also known as trade-off or coupling) between parameters, but the current parameter decoupling technique for TTI–based FWI is not mature. To address the first problem, we assess the interaction between θ t ${{\theta }_{\mathrm{t}}}$ and other parameters by analysing the radiation patterns in the TTI background. Our analysis reveals that θ t ${{\theta }_{\mathrm{t}}}$ is most coupled by S-wave vertical velocity v s 0 ${{v}_{{\mathrm{s}}0}}$ , and θ t ${{\theta }_{\mathrm{t}}}$ substantially affects anisotropic parameters ε $\varepsilon $ and δ $\delta $ . Therefore, we conclude that a good inversion of velocity parameters is a prerequisite for recovering θ t ${{\theta }_{\mathrm{t}}}$ , and only after θ t ${{\theta }_{\mathrm{t}}}$ recovers can ε $\varepsilon $ and δ $\delta $ be recovered. This conclusion provides a natural perspective for solving the second problem. We therefore propose a multi-step and multi-parameter joint inversion strategy to gradually improve the quality of parameter inversion and weaken their coupling. Numerical experiments demonstrate that our strategy achieves more accurate inversion results compared to previously proposed multi-parameter inversion strategies. Finally, the application to the field OBN dataset acquired from the South China Sea verifies the practicality of our method.

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来源期刊
Geophysical Prospecting
Geophysical Prospecting 地学-地球化学与地球物理
CiteScore
4.90
自引率
11.50%
发文量
118
审稿时长
4.5 months
期刊介绍: Geophysical Prospecting publishes the best in primary research on the science of geophysics as it applies to the exploration, evaluation and extraction of earth resources. Drawing heavily on contributions from researchers in the oil and mineral exploration industries, the journal has a very practical slant. Although the journal provides a valuable forum for communication among workers in these fields, it is also ideally suited to researchers in academic geophysics.
期刊最新文献
Issue Information Simultaneous inversion of four physical parameters of hydrate reservoir for high accuracy porosity estimation A mollifier approach to seismic data representation Analytic solutions for effective elastic moduli of isotropic solids containing oblate spheroid pores with critical porosity An efficient pseudoelastic pure P-mode wave equation and the implementation of the free surface boundary condition
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