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Author :
Publisher : Stanford University
ISBN 13 :
Total Pages : 198 pages
Book Rating : 4./5 ( download)
Download or read book Migration-Velocity Analysis using Image-Space Generalized Wavefields written by and published by Stanford University. This book was released on with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Claudio Guerra Cardoso
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.56/5 ( download)
Download or read book Migration-velocity Analysis Using Image-space Generalized Wavefields written by Claudio Guerra Cardoso and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Yaxun Tang
Publisher : Stanford University
ISBN 13 :
Total Pages : 239 pages
Book Rating : 4.66/5 ( download)
Download or read book Imaging and Velocity Analysis by Target-oriented Wavefield Inversion written by Yaxun Tang and published by Stanford University. This book was released on 2011 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Yaofeng He
Publisher :
ISBN 13 :
Total Pages : 630 pages
Book Rating : 4.50/5 ( download)
Download or read book Wave-equation Migration Velocity Analysis Based on Finite Frequency Sensitivity Kernels written by Yaofeng He and published by . This book was released on 2010 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Biondo Biondi
Publisher : SEG Books
ISBN 13 : 1560801379
Total Pages : 248 pages
Book Rating : 4.75/5 ( download)
Download or read book 3D Seismic Imaging written by Biondo Biondi and published by SEG Books. This book was released on 2006 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying CD-ROM includes PDF slides for teaching the material in the book and the C3-narrow-azimuth classic data set.
Author : Gerard T. Schuster
Publisher : SEG Books
ISBN 13 : 156080341X
Total Pages : 377 pages
Book Rating : 4.16/5 ( download)
Download or read book Seismic Inversion written by Gerard T. Schuster and published by SEG Books. This book was released on 2017-07-01 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author :
Publisher :
ISBN 13 :
Total Pages : 784 pages
Book Rating : 4.95/5 ( download)
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1984 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Richard D. Miller
Publisher : SEG Books
ISBN 13 : 1560802243
Total Pages : 513 pages
Book Rating : 4.42/5 ( download)
Download or read book Advances in Near-surface Seismology and Ground-penetrating Radar, Volume 15 written by Richard D. Miller and published by SEG Books. This book was released on 2010-01-11 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : N. Bleistein
Publisher : Springer Science & Business Media
ISBN 13 : 9780387950617
Total Pages : 546 pages
Book Rating : 4.13/5 ( download)
Download or read book Mathematics of Multidimensional Seismic Imaging, Migration, and Inversion written by N. Bleistein and published by Springer Science & Business Media. This book was released on 2000-12-15 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: For more than 80 years, the oil and gas industry has used seismic methods to construct images and determine physical characteristics of rocks that can yield information about oil and gas bearing structures in the earth. This book presents the different seismic data processing methods, also known as seismic "migration," in a unified mathematical way. The book serves as a bridge between the applied math and geophysics communities by presenting geophysicists with a practical introduction to advanced engineering mathematics, while presenting mathematicians with a window into the world of the mathematically sophisticated geophysicist.
Author : Saleh M. Al-Saleh
Publisher :
ISBN 13 :
Total Pages : 374 pages
Book Rating : 4.41/5 ( download)
Download or read book Designing Explicit Wavefield Extrapolators for Depth Migration and Migration Velocity Analysis written by Saleh M. Al-Saleh and published by . This book was released on 2006 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
