Elastic Reverse-Time Migration with Complex Topography

Zhong, Yu; Gu, Hanming; Liu, Yangting; Mao, Qinghui

doi:10.3390/en14237837

Cited by 10 publications

(7 citation statements)

References 23 publications

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“…The red line is the surface topography. Zhong et al, 2019Zhong et al, , 2021aZhong et al, , 2021bZhu, 2017), which can provide more image information for parameter estimation and reservoir characterization. The fluid-related hydrocarbon reservoirs and some special geologic structures (e.g., the gas plume or chimney) can be identified more accurately through the images of ERTM.…”

Section: F I G U R Ementioning

confidence: 99%

“…It is necessary to separate the elastic wavefield into P-waves and S-waves for obtaining uncontaminated and meaningful migration results in ERTM (Dellinger & Etgen, 1990;Sun & McMechan, 2001). At present, there are three main wave-mode separation methods to separate the elastic wavefield into P-waves and S-waves, including the Helmholtz separation method (Dellinger & Etgen, 1990;Sun & McMechan, 2001;Yang et al, 2018Yang et al, , 2019Zhu, 2017), wavenumber domain-based separation method (Zhang & McMechan, 2010) and separation elastic wave equations-based separation method (Du et al, 2017;Gu et al, 2015;Xiao & Leaney, 2010;Zhong et al, 2019Zhong et al, , 2021aZhong et al, , 2021b. The most effective and simple wave-mode separation method is the Helmholtz separation method -the divergence operator and curl operator.…”

Section: F I G U R Ementioning

confidence: 99%

“…Because the fluid‐related hydrocarbon reservoirs and the special geologic structures are not often observed in the PP‐wave image of acoustic RTM but are available in the PS‐wave image of ERTM (Caldwell, 1999). In the past few years, many researchers have studied and improved ERTM (Du et al., 2012, 2017; Nguyen & McMechan, 2015; Sun & McMechan, 2001; Wang & McMechan, 2015; Yang et al., 2018, 2019, 2019, 2021a, 2021b; Zhu, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Surface topography will affect the propagation path of seismic wavefields and bring some challenges to seismic data acquisition and processing (Zhong et al., 2021b). Static correction is a key and basic step in the conventional seismic data processing.…”

Section: Introductionmentioning

confidence: 99%

“…RTM has become more popular than ray‐based migration (Hill, 1990; Schneider, 1978) and one‐way wave‐equation–based migration (Claerbout, 1971; Gazdag, 1978; Zhang et all., 2005; Zhong et al., 2022) in complex subsurface structure (e.g., beneath salts) imaging. With the development of multi‐wave and multi‐component seismic exploration technology in recent years, many multi‐wave and multi‐component technologies, including elastic reverse time migration (Du et al., 2012, 2017; Nguyen & McMechan, 2015; Wang & McMechan, 2015; Zhong et al., 2019, 2021a, 2021b), elastic full‐waveform inversion (e.g., Ren & Liu, 2016; Tarantola, 1986; Virieux & Operto, 2009) and so on, have drawn more and more attention. Elastic reverse time migration (ERTM) is one of the most important technologies in multi‐wave and multi‐component seismic exploration, which can provide geologic structural features of subsurface reservoirs and basic data for multi‐component interpretation and inversion.…”

Section: Introductionmentioning

confidence: 99%

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Elastic reverse time migration method in vertical transversely isotropic media including surface topography

Zhong

Liu

et al. 2022

Geophysical Prospecting

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Compared with acoustic seismic data, multi-wave and multi-component seismic data can offer some special media properties. Elastic reverse time migration is a highprecision migration method to image multi-wave and multi-component seismic data. Anisotropy widely exists in the earth, and it is important to take anisotropy into account and correct the anisotropy effect for obtaining high-quality image results during migration. However, accurate elastic reverse time migration in anisotropic media is still a challenging task, particularly for areas with irregular surface topography. To resolve these issues, a new elastic reverse time migration method is developed to correct the anisotropy effect in vertical transversely isotropic media with surface topography. We first use the modified pseudo-acoustic wave equations of vertical transversely isotropic media to assist the elastic wavefield separation in vertical transversely isotropic media for suppressing the crosstalk artefacts between different wave modes and further generating high-quality images. We then use a topography-related filter to remove the influence of surface topography on the migration results of elastic reverse time migration. The advantage of the proposed topography-related filter is that we do not need to make any changes to the conventional finite-difference method based on regular grids but can calculate the wavefield in the areas with irregular surface topography efficiently.The synthetic examples with different surface topographies models demonstrate that our proposed elastic reverse time migration method can correct the anisotropy effect effectively, remove the influence of surface topography on elastic reverse time migration results, and generate high-quality images.

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Section: F I G U R Ementioning

confidence: 99%

Section: F I G U R Ementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Elastic reverse time migration method in vertical transversely isotropic media including surface topography

Zhong

Liu

et al. 2022

Geophysical Prospecting

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Application of iterative elastic reverse time migration to shear horizontal ultrasonic echo data obtained at a concrete step specimen

Grohmann,

Niederleithinger,

Büttner

et al. 2024

Near Surface Geophysics

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The ultrasonic echo technique is broadly applied in non‐destructive testing (NDT) of concrete structures involving tasks such as measuring thickness, determining geometry and locating built‐in elements. To address the challenge of enhancing ultrasonic imaging for complex concrete constructions, we adapted a seismic imaging algorithm – reverse time migration (RTM) – for NDT in civil engineering. Unlike the traditionally applied synthetic aperture focusing technique (SAFT), RTM takes into account the full wavefield including primary and reflected arrivals as well as multiples. This capability enables RTM to effectively handle all wave phenomena, unlimited by changes in velocity and reflector inclinations. This paper concentrates on applying and evaluating a two‐dimensional elastic RTM algorithm that specifically addresses horizontally polarized shear (SH) waves only, as these are predominantly used in ultrasonic NDT of concrete structures. The elastic SH RTM algorithm was deployed for imaging real ultrasonic echo SH‐wave data obtained at a concrete specimen exhibiting a complex back wall geometry and containing four tendon ducts. As these features are frequently encountered in practical NDT scenarios, their precise imaging holds significant importance. By applying the elastic SH RTM algorithm, we successfully reproduced nearly all reflectors within the concrete specimen. In particular, we were capable of accurately reconstructing all vertically oriented reflectors as well as the circular cross sections of three tendon ducts, which was not achievable with traditional SAFT imaging. These findings demonstrate that elastic SH RTM holds the ability to considerably improve the imaging of complex concrete geometries, marking a crucial advancement for accurate, high‐quality ultrasonic NDT in civil engineering.

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Application of Elastic P-SV Reverse Time Migration to Synthetic Ultrasonic Echo Data from Concrete Members

Grohmann¹,

Niederleithinger²,

Buske³

et al. 2023

J Nondestruct Eval

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The ultrasonic echo technique is frequently used in non-destructive testing (NDT) of concrete structures for thickness measurements, geometry determinations as well as localization of built-in components. To improve ultrasonic imaging of complex structures in concrete, we transferred a geophysical imaging technique, the reverse time migration (RTM), to NDT in civil engineering. In contrast to the conventionally used synthetic aperture focusing technique (SAFT) algorithms, RTM is a wavefield continuation method in time and uses the full wave equation. Thus, RTM can handle complicated wave propagations in any direction without dip limitation. In this paper, we focused on the application and evaluation of a two-dimensional (2D) elastic RTM algorithm considering compressional waves, vertically polarized shear waves, and Rayleigh waves. We tested the elastic RTM routine on synthetic ultrasonic echo data generated with a 2D concrete model consisting of several steps and circular air inclusions. As these complex structures can often be found in real-world NDT use cases, their imaging is especially important. By using elastic RTM, we were able to clearly reproduce vertical reflectors and lower edges of circular air voids inside our numerical concrete model. Such structures cannot be imaged with conventional SAFT algorithms. Furthermore, the used elastic RTM approach also yielded a better reconstruction of a horizontal reflector and upper boundaries of circular air inclusions. Our encouraging results demonstrate that elastic RTM has the potential to significantly improve the imaging of complex concrete structures and, thus, is a step forward for detailed, high-quality ultrasonic NDT in civil engineering.

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Elastic Reverse-Time Migration with Complex Topography

Cited by 10 publications

References 23 publications

Elastic reverse time migration method in vertical transversely isotropic media including surface topography

Elastic reverse time migration method in vertical transversely isotropic media including surface topography

Application of iterative elastic reverse time migration to shear horizontal ultrasonic echo data obtained at a concrete step specimen

Application of Elastic P-SV Reverse Time Migration to Synthetic Ultrasonic Echo Data from Concrete Members

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