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Author: Thomas Hertweck
Publisher:
ISBN: 9783832505127
Category :
Languages : en
Pages : 0
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Book Description
An important task in seismic reflection imaging is to estimate subsurface structures from the prestack data. This means that the reflection events in the recorded data have to be transformed into images in the depth domain, the reflectors. A geometrically appealing approach for the corresponding process is Kirchhoff migration which is based on an integral solution of the wave equation. Applied in its original purely kinematic form, this process provides a structural image of the target region under investigation. However, Kirchhoff migration is also able to handle the amplitude-related aspects of wave propagation, thus allowing to assign physically sound amplitude values to reflector images. In such a true-amplitude migration, the geometrical spreading effects are removed from the input data during the imaging process and, thus, reflector amplitudes become basically a measure of the angle-dependent reflection coefficient. Commencing with the basics of wave propagation and ray theory, a complete description of Kirchhoff migration is presented. By relating the strict mathematical derivation of true-amplitude Kirchhoff migration to clear geometrical concepts, the gap between the originally graphical migration schemes and the nowadays available analytical descriptions based on a stationary-phase evaluation is closed. Further aspects relevant to the correct recovery of amplitudes in depth migration, such as the handling of topography and irregular geometries, are explained in a mathematical as well as in a geometrical manner. Finally, Kirchhoff migration is integrated into a seismic reflection imaging workflow based on the data-driven common-reflection-surface (CRS) stack method.
Author: Thomas Hertweck
Publisher:
ISBN: 9783832505127
Category :
Languages : en
Pages : 0
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Book Description
An important task in seismic reflection imaging is to estimate subsurface structures from the prestack data. This means that the reflection events in the recorded data have to be transformed into images in the depth domain, the reflectors. A geometrically appealing approach for the corresponding process is Kirchhoff migration which is based on an integral solution of the wave equation. Applied in its original purely kinematic form, this process provides a structural image of the target region under investigation. However, Kirchhoff migration is also able to handle the amplitude-related aspects of wave propagation, thus allowing to assign physically sound amplitude values to reflector images. In such a true-amplitude migration, the geometrical spreading effects are removed from the input data during the imaging process and, thus, reflector amplitudes become basically a measure of the angle-dependent reflection coefficient. Commencing with the basics of wave propagation and ray theory, a complete description of Kirchhoff migration is presented. By relating the strict mathematical derivation of true-amplitude Kirchhoff migration to clear geometrical concepts, the gap between the originally graphical migration schemes and the nowadays available analytical descriptions based on a stationary-phase evaluation is closed. Further aspects relevant to the correct recovery of amplitudes in depth migration, such as the handling of topography and irregular geometries, are explained in a mathematical as well as in a geometrical manner. Finally, Kirchhoff migration is integrated into a seismic reflection imaging workflow based on the data-driven common-reflection-surface (CRS) stack method.
Author: Jörg Schleicher
Publisher: SEG Books
ISBN: 1560801433
Category : Science
Languages : en
Pages : 401
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Book Description
Providing a pictorial presentation of the basic principles of Kirchhoff-type imaging and proceeding to a comprehensive treatment of its kinematic and dynamic aspects, this book is a valuable addition for anyone interested in the theory and practices of seismic data processing for imaging and parameter estimation with all its attendant processes.
Author: Christoph Jäger
Publisher:
ISBN: 9783832509675
Category :
Languages : en
Pages : 111
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Book Description
Die Reflexionsseismik ist eine erfolgreiche Methode der Explorationsgeophysik zur Erkundung von Kohlenwasserstoff-Lagerstätten. Ein zentraler Prozess hierbei ist die Migration, die Transformation der reflexionsseismischen Messdaten in ein Abbild des Erduntergrundes. Wird bei dieser Transformation der geometrische Ausbreitungsverlust rückgängig gemacht, so spricht man von einer amplitudenbewahrenden Migration. Die Amplituden im migrierten Abbild sind dann ein Maß für den winkelabhängigen Reflexionskoeffizienten und erlauben Rückschlüsse auf physikalische Eigenschaften der Reflektoren im Untergrund. Somit können benachbarte Gesteinsschichten charakterisiert werden, was wertvolle Informationen für Interpretation und Exploration liefert. In dieser Dissertation befasse ich mich mit einem häufig eingesetzten Migrationsverfahren, der (amplitudenbewahrenden) Kirchhoff-Migration.Reflection seismics plays an important role in the exploration industry for the search of hydrocarbon reservoirs. A central process of the reflection seismic method is migration, the transformation of the recorded and processed seismic field data into an image of the subsurface. In this thesis, I focus on a migration technique that is widely investigated and frequently applied: true-amplitude Kirchhoff migration. The term true-amplitude implies that the effect of geometrical spreading is removed in the migration process and, hence, amplitudes in the final subsurface image become a measure of the angle-dependent reflection coefficient. This allows to study physical properties of reflectors in the earth and, thus, to characterize adjacent rock formations which is crucial for successful interpretation and exploration.As main result of this thesis, I present a new strategy to improve the efficiency as well as the image quality of (true-amplitude) Kirchhoff migration: making use of the kinematic wavefield attributes obtained with the Common-Reflection-Surface (CRS) stack method allows to determine minimum migration apertures. Furthermore, I show how to extend existing migration implementations to correctly handle data recorded with irregular acquisition geometry on a measurement surface with topographic variations as these aspects have a decisive impact on the final amplitudes.Als wichtigstes Resultat dieser Arbeit präsentiere ich ein Verfahren zur Verbesserung von Effizienz und Abbildungsqualität der Kirchhoff-Migration, das auf den kinematischen Wellenfeldattributen basiert, die mittels der Common-Reflection-Surface (CRS) stack Methode gewonnen werden. Diese Wellenfeldattribute erlauben die Bestimmung von minimalen Migrationsaperturen. Des Weiteren demonstriere ich, wie die Kirchhoff-Migration implementiert werden kann um auch solche Daten amplitudenbewahrend verarbeiten zu können, die mit irregulären Messgeometrien und auf topographiebehafteten Messoberflächen aufgezeichnet wurden.
Author:
Publisher:
ISBN:
Category : Seismology
Languages : en
Pages : 32
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Book Description
Author: European Association of Geoscientists and Engineers
Publisher:
ISBN:
Category : Enhanced oil recovery
Languages : en
Pages : 986
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Book Description
Author: Sergey Fomel
Publisher: SEG Books
ISBN: 156080226X
Category : Science
Languages : en
Pages : 543
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Book Description
Presents a collection of papers which appear in the September-October 2010 Geophysics special section, written by recognised experts in various areas of exploration geophysics, plus an additional group of papers drawn from Geophysics which address areas beyond those invited articles. The result is a snapshot of the state-of-the-art in the field.
Author: Ivan Psencik
Publisher: Birkhäuser
ISBN: 3034881460
Category : Science
Languages : en
Pages : 518
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Book Description
This special issue contains contributions presented at the international workshop Seismic Waves in Laterally Inhomogeneous Media V, which was held at the Castle of Zahrádky, Czech Republic, June 5 - 9, 2000. The workshop, which was attended by about 60 seismologists from 16 countries, was devoted mainly to the current state of theoretical and computational means of study of seismic wave propagation in complex structures. The special issue begins with papers dealing with the study and the application of the ray methods. Problems such as coupling of quasi-shear waves or smoothing of models for effective ray computations are dealt with. Applications of the ray methods in seismic exploration are presented. Further, directional wavefield decomposition, phase space, path integral and parabolic equation methods are discussed. Attention is also devoted to attenuation and scattering problems, and to seismic inversion problems.
Author: Robert H. Stolt
Publisher: Cambridge University Press
ISBN: 1139505289
Category : Technology & Engineering
Languages : en
Pages : 417
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Book Description
Extracting information from seismic data requires knowledge of seismic wave propagation and reflection. The commonly used method involves solving linearly for a reflectivity at every point within the Earth, but this book follows an alternative approach which invokes inverse scattering theory. By developing the theory of seismic imaging from basic principles, the authors relate the different models of seismic propagation, reflection and imaging - thus providing links to reflectivity-based imaging on the one hand and to nonlinear seismic inversion on the other. The comprehensive and physically complete linear imaging foundation developed presents new results at the leading edge of seismic processing for target location and identification. This book serves as a fundamental guide to seismic imaging principles and algorithms and their foundation in inverse scattering theory, and is a valuable resource for working geoscientists, scientific programmers and theoretical physicists.
Author:
Publisher:
ISBN:
Category : Prospecting
Languages : en
Pages : 1188
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Book Description
Author: Harsh Gupta
Publisher: Springer Science & Business Media
ISBN: 904818701X
Category : Science
Languages : en
Pages : 1579
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Book Description
The past few decades have witnessed the growth of the Earth Sciences in the pursuit of knowledge and understanding of the planet that we live on. This development addresses the challenging endeavor to enrich human lives with the bounties of Nature as well as to preserve the planet for the generations to come. Solid Earth Geophysics aspires to define and quantify the internal structure and processes of the Earth in terms of the principles of physics and forms the intrinsic framework, which other allied disciplines utilize for more specific investigations. The first edition of the Encyclopedia of Solid Earth Geophysics was published in 1989 by Van Nostrand Reinhold publishing company. More than two decades later, this new volume, edited by Prof. Harsh K. Gupta, represents a thoroughly revised and expanded reference work. It brings together more than 200 articles covering established and new concepts of Geophysics across the various sub-disciplines such as Gravity, Geodesy, Geomagnetism, Seismology, Seismics, Deep Earth Processes, Plate Tectonics, Thermal Domains, Computational Methods, etc. in a systematic and consistent format and standard. It is an authoritative and current reference source with extraordinary width of scope. It draws its unique strength from the expert contributions of editors and authors across the globe. It is designed to serve as a valuable and cherished source of information for current and future generations of professionals.
