Results 41 to 50 of about 3,292,250 (298)
Chapter 5 Full waveform inversion [PDF]
, 2020 In the geophysics of oil exploration and reservoir studies, the surface seismic method is the most commonly used method to obtain a subsurface model in 2 or 3 dimensions. This method plays an increasingly important role in soil investigations for geotechnical, hydrogeological and site characterization studies regarding seismic hazard issues.
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Optimal Inversion Method Based on Joint Waveform Inversion and Least Squares Reverse Time Migration [PDF]
LithosphereJoint Waveform inversion (JWI) uses the results of reflection waveform inversion (RWI) as the initial model for full waveform inversion (FWI). Compared with the FWI, the JWI method can obtain more information about the structure of the subsurface medium.
Kai Zhang +4 more
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3D anisotropic full-waveform inversion for complex salt provinces
Frontiers in Earth Science, 2023 Seismic imaging and inversion become extremely challenging when dealing with salt structures. Conventional state-of-the-art full-waveform inversion (FWI) fails to recover those features in areas where salt is present.
Junxiao Li +4 more
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Inner core structure behind the PKP core phase triplication [PDF]
, 2015 The structure of the Earth's inner core is not well known between depths of ∼100–200 km beneath the inner core boundary. This is a result of the PKP core phase triplication and the existence of strong precursors to PKP phases, which hinder the ...
Deuss, Arwen +9 more
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Reflection full waveform inversion [PDF]
Science China Earth Sciences, 2017 Because of the combination of optimization algorithms and full wave equations, full-waveform inversion (FWI) has become the frontier of the study of seismic exploration and is gradually becoming one of the essential tools for obtaining the Earth interior information. However, the application of conventional FWI to pure reflection data in the absence of
Gang Yao, Di Wu
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Extended full waveform inversion with matching filter
, 2020 Full waveform inversion has shown its huge potentials in recovering a high-resolution subsurface model. However, conventional full waveform inversion usually suffers from cycle skipping, resulting in an inaccurate local minimum model.
Li, Yuanyuan +3 more
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Case studies of ultrasonic full waveform inversion for inspecting concrete structures
e-Journal of Nondestructive TestingThe non-destructive evaluation of reinforced pre-stressed concrete structures is critical to prevent catastrophic failures of aging infrastructure. Conventional non-destructive inspection methods often rely on manual and subjective interpretation of the
David Sollberger +5 more
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Full waveform inversion using triangular waveform adapted meshes
CoRR, 2021 In this article, continuous Galerkin finite elements are applied to perform full waveform inversion (FWI) for seismic velocity model building. A time-domain FWI approach is detailed that uses meshes composed of variably sized triangular elements to discretize the domain.
Keith J. Roberts +5 more
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3D variable-grid full-waveform inversion on GPU
Petroleum Science, 2019 Full-waveform inversion (FWI) is a powerful tool to reconstruct subsurface geophysical parameters with high resolution. As 3D surveys become widely implemented, corresponding 3D processing techniques are required to solve complex geological cases, while ...
Zi-Ying Wang +5 more
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3D Bayesian Variational Full-Waveform Inversion
Geophysical Journal International, 2023 Seismic full-waveform inversion (FWI) produces high resolution images of the subsurface by exploiting information in full acoustic, seismic or electromagnetic waveforms, and has been applied at global, regional and industrial spatial scales. FWI inverse problems are traditionally solved by using optimization, in which one seeks a best model by ...
Xin Zhang +4 more
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