Migration Velocity Analysis Using Image Space Generalized Wavefields
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Migration Velocity Analysis Using Image Space Generalized Wavefields
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Author :
language : en
Publisher: Stanford University
Release Date :
Migration Velocity Analysis Using Image Space Generalized Wavefields written by and has been published by Stanford University this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Imaging And Velocity Analysis By Target Oriented Wavefield Inversion
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Author : Yaxun Tang
language : en
Publisher: Stanford University
Release Date : 2011
Imaging And Velocity Analysis By Target Oriented Wavefield Inversion written by Yaxun Tang and has been published by Stanford University this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
This thesis develops a novel target-oriented inversion framework that uses wavefields as carriers of information to image both low-wavenumber component (a.k.a. background velocity) and high-wavenumber component (a.k.a. reflectivity) of the earth model in complex geological settings, such as subsalt regions. I address the problem of reflectivity imaging with target-oriented wavefield least-squares migration, and the problem of velocity estimation with target-oriented wavefield tomography. Reflectivity images of the subsurface are commonly produced by prestack depth migration. When the overburden is complex and the reflectors are unevenly or insufficiently illuminated, the migration operator alone is inadequate to provide an optimal image. I tackle the problem of distorted illumination in reflectivity imaging by wavefield least-squares migration. I formulate least-squares migration in the image domain and solve it in a target-oriented fashion. In the image-domain formulation, explicit computation of the Hessian operator (the resolution function that measures the illumination deficiency of the imaging system) is the most important and challenging step. I develop a novel method based on phase encoding to efficiently and accurately compute the target-oriented Hessian operator. The Hessian operator is then used to recover the reflectivity by iterative inverse filtering. I regularize the inversion with dip constraints, which naturally incorporate interpreted geological information into the inversion. Accurate imaging of the reflectivity also requires an accurate background velocity model. High-quality velocity model-building in complex geology requires wavefield-based velocity analysis to properly model band-limited wave phenomena. However, the high cost and lack of flexibility of target-oriented model-building prevent this method from being widely used in practice. I overcome the cost and flexibility issues of wavefield-based migration velocity analysis by developing target-oriented wavefield tomography. Target-oriented wavefield tomography is achieved by synthesizing a new data set specifically for velocity analysis. The new data set is generated based on an initial unfocused target image and by a novel application of generalized Born wavefield modeling, which correctly preserves velocity kinematics by modeling both zero and non-zero subsurface-offset-domain images. The new data set can be synthesized for a chosen target region with velocity inaccuracies. The reduced data size and computation domain, therefore, greatly improve the efficiency and flexibility of wavefield tomography, allowing fast and interpretation-driven interactive wavefield-based velocity analysis, where different geological scenarios or hypotheses can be tested in quasi-real time. The proposed target-oriented inversion framework successfully estimates subsalt velocities and recovers subsalt reflectivities from distorted illumination from 2-D synthetic and 3-D field data.
Migration Velocity Analysis Using Image Space Generalized Wavefields
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Author : Claudio Guerra Cardoso
language : en
Publisher:
Release Date : 2010
Migration Velocity Analysis Using Image Space Generalized Wavefields written by Claudio Guerra Cardoso and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
An accurate depth-velocity model is the key for obtaining good quality and reliable depth images in areas of complex geology. In such areas, velocity-model definition should use methods that describe the complexity of wavefield propagation, such as focusing and defocusing, multiple arrivals, and frequency-dependent velocity sensitivity. Wave-equation tomography in the image space has the ability to handle these issues because it uses wavefields as carriers of information. However, its high cost and low flexibility for parametrizing the model space has prevented its routine industrial use. This thesis aims at overcoming those limitations by using new wavefields as carriers of information: the image-space generalized wavefields. These wavefields are synthesized by using a pre-stack generalization of the exploding-reflector model. Cost of wave-equation tomography in the image space is decreased because only a small number of image-space generalized wavefields are necessary to accurately describe the kinematics of velocity errors and because these wavefields can be easily used in a target-oriented way. Flexibility is naturally incorporated into wave-equation tomography in the image space by using these wavefields because their modeling have as the initial conditions some key selected reflectors, allowing a layer-based parametrization of the model space. To use the image-space generalized wavefields in wave-equation tomography in the image space, the method is extended from the shot-profile domain to the image-space generalized-sources domain. In this new domain, the velocity updates are very fast. Migration with the optimized velocity model provides good quality and reliable depth images, as can be seen in a 3D-field data example.
3d Seismic Imaging
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Author : Biondo Biondi
language : en
Publisher: SEG Books
Release Date : 2006
3d Seismic Imaging written by Biondo Biondi and has been published by SEG Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Computers categories.
Accompanying CD-ROM includes PDF slides for teaching the material in the book and the C3-narrow-azimuth classic data set.
Advances In Near Surface Seismology And Ground Penetrating Radar Volume 15
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Author : Richard D. Miller
language : en
Publisher: SEG Books
Release Date : 2010-01-11
Advances In Near Surface Seismology And Ground Penetrating Radar Volume 15 written by Richard D. Miller and has been published by SEG Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-01-11 with Science categories.
Advances in Near-surface Seismology and Ground-penetrating Radar (SEG Geophysical Developments Series No. 15) is a collection of original papers by renowned and respected authors from around the world. Technologies used in the application of near-surface seismology and ground-penetrating radar have seen significant advances in the last several years. Both methods have benefited from new processing tools, increased computer speeds, and an expanded variety of applications. This book, divided into four sections--"Reviews," "Methodology," "Integrative Approaches," and "Case Studies"--Captures the most significant cutting-edge issues in active areas of research, unveiling truly pertinent studies that address fundamental applied problems. This collection of manuscripts grew from a core group of papers presented at a post-convention workshop, "Advances in Near-surface Seismology and Ground-penetrating Radar," held during the 2009 SEG Annual Meeting in Houston, Texas. This is the first cooperative publication effort between the near-surface communities of SEG, AGU, and EEGS. It will appeal to a large and diverse audience that includes researchers and practitioners inside and outside the near-surface geophysics community. --Publisher description.
Seismic Inversion
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Author : Gerard T. Schuster
language : en
Publisher: SEG Books
Release Date : 2017-07-01
Seismic Inversion written by Gerard T. Schuster and has been published by SEG Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-07-01 with Science categories.
This book describes the theory and practice of inverting seismic data for the subsurface rock properties of the earth. The primary application is for inverting reflection and/or transmission data from engineering or exploration surveys, but the methods described also can be used for earthquake studies. Seismic Inversion will be of benefit to scientists and advanced students in engineering, earth sciences, and physics. It is desirable that the reader has some familiarity with certain aspects of numerical computation, such as finite-difference solutions to partial differential equations, numerical linear algebra, and the basic physics of wave propagation. For those not familiar with the terminology and methods of seismic exploration, a brief introduction is provided. To truly understand the nuances of seismic inversion, we have to actively practice what we preach (or teach). Therefore, computational labs are provided for most of the chapters, and some field data labs are given as well.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1984
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with Mechanics, Applied categories.
3d Seismic Imaging
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Author : Biondo Biondi
language : en
Publisher:
Release Date : 2006
3d Seismic Imaging written by Biondo Biondi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Seismic reflection method categories.
Earthquake Notes
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Author : Seismological Society of America. Eastern Section
language : en
Publisher:
Release Date : 1985
Earthquake Notes written by Seismological Society of America. Eastern Section and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Earthquakes categories.
No. 1/2 of each vol., 1930- form the Proceedings or abstracts of proceedings of the section's annual meetings, some of which were held jointly with the Section of Seismology of the American Geophysical Union. No. for 1953-62 include Minutes of the Eastern Section meetings 25th-34th.
The Leading Edge
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Author :
language : en
Publisher:
Release Date : 2004-07
The Leading Edge written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-07 with Electronic journals categories.