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sep:research:theses:sep144 [2011/07/18 17:41]
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sep:research:theses:sep144 [2015/05/27 02:06] (current)
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**Table of contents** **Table of contents**
-  * Opening pages: Abstract; Preface; Acknowledgments; Contents (PDF) +  * Chapter 1: Introduction 
-  * Chapter 1: Introduction (PDF) +  * Chapter 2: Target-oriented wavefield least-squares migration 
-  * Chapter 2: Target-oriented wavefield least-squares migration (PDF) +  * Chapter 3: Target-oriented wavefield tomography 
-  * Chapter 3: Target-oriented wavefield tomography (PDF) +  * Chapter 4: 3-D field-data examples 
-  * Chapter 4: 3-D field-data examples (PDF) +  * Chapter 5: Conclusions 
-  * Chapter 5: Conclusions (PDF) +  * Appendix A: Convergence property of plane-wave phase encoding 
-  * Bibliography (PDF) +  * Appendix B: Convergence property of random phase encoding 
 +  * Appendix C: Wave-equation tomographic operator 
 +  * Appendix D: 3-D conical-wave migration 
 +  * Appendix E: Seismic visibility analysis
**Abstract** **Abstract**
-This thesis develops a novel target-oriented inversion framework that uses wavefields as carriers of information to image both low- and high-wavenumber components of the earth model in complex geological settings, such as subsalt regions. The low-wavenumber component of the earth model is often known as the background velocity, whereas the high-wavenumber component of the earth model is often known as the reflectivity. 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.+This thesis develops a novel target-oriented inversion framework that uses wavefields as carriers of information to image both low- and high-wavenumber components of the earth model in complex geological settings, such as subsalt regions. The low-wavenumber component of the earth model is often known as background velocity, whereas the high-wavenumber component of the earth model is often known as reflectivity. 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. 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.
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