Anisotropic Seismic Wave Propagation
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Seismic Signatures And Analysis Of Reflection Data In Anisotropic Media
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Author : Ilya Tsvankin
language : en
Publisher: SEG Books
Release Date : 2012
Seismic Signatures And Analysis Of Reflection Data In Anisotropic Media written by Ilya Tsvankin and has been published by SEG Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Nature categories.
This is the third edition of Ilya Tsvankin's reference volume on seismic anisotropy and application of anisotropic models in reflection seismology. Seismic Signatures and Analysis of Reflection Data in Anisotropic Media, (Geophysical References Series No. 19), provides essential background information about anisotropic wave propagation, introduces efficient notation for transversely isotropic (TI) and orthorhombic media, and identifies the key anisotropy parameters for imaging and amplitude analysis. To gain insight into the influence of anisotropy on a wide range of seismic signatures, exact solutions are simplified in the weak-anisotropy approximation. Particular attention is given to moveout analysis and P-wave time-domain processing for transverse isotropy with a vertical (VTI) and tilted (TTI) symmetry axis. Description of the amplitude-variation-with-offset (AVO) response of P- and S-waves in TI media shows that anisotropy may cause serious distortions in both the reflection coefficient and geometrical-spreading factor. The far-reaching benefits of anisotropic processing methods are demonstrated on synthetic examples and field data.
Seismic Anisotropy In The Earth
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Author : V. Babuska
language : en
Publisher: Springer Science & Business Media
Release Date : 1991-07-31
Seismic Anisotropy In The Earth written by V. Babuska and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991-07-31 with Science categories.
Structural geologists are well aware of the fact that isotropic rocks are quite exceptional in nature. Whicheverorigin, sedimentary, metamorphicormagmatic, rocks are shaped with a plane of mineral flattening, the foliation in geologists' jargon, and with a line ofmineral elongation, the lineation. Just like a good quarryman, a trained structural geologistwill detectapreferredorientationin an apparently isotropic granite. Preferred mineral orientation and thus structural anisotropy are the rule in nature. Consideringthe largevariationsinelasticcoefficientsofrock-forming minerals, itcould be predicted that, in turn, seismic anisotropy should exist and be important, provided thatdomains withasimilarstructural signatureare largeenough to affectseismic waves. This is why, in 1982 at a conference held in Frankfurt, which was oneofthe fIrst meetings devoted to the subject of seismic anisotropy, I asked Don Anderson the question of why seismologists had not considered earlier in their models the obvious constraint of anisotropy. I still remember Don's answer: "Adolphe, we knew that our isotropic models were not very good but we had no other choice. It is simply that, so far, computerswere not largeenough tointegrate the anisotropy parameter". Changingisotropic glassesfor anisotropic ones permits us to obtain betterand more realistic seismic modelsofthe Earth's interior, but, maybe more importantly, it has, for a seismologist, the farreaching consequenceofsteppinginto the fIeld ofgeodynamics.
Understanding Seismic Anisotropy In Exploration And Exploitation Second Edition
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Author : Leon Thomsen
language : en
Publisher: SEG Books
Release Date : 2014-10-01
Understanding Seismic Anisotropy In Exploration And Exploitation Second Edition written by Leon Thomsen and has been published by SEG Books this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-10-01 with Science categories.
Understanding Seismic Anisotropy in Exploration and Exploitation (second edition) by Leon Thomsen is designed to show you how to recognize the effects of anisotropy in your data and to provide you with the intuitive concepts that you will need to analyze it. Since its original publication in 2002, seismic anisotropy has become a mainstream topic in exploration geophysics. With the emergence of the shale resource play, the issues of seismic anisotropy have become central, because all shales are seismically anisotropic, whether fractured or not. With the advent of wide-azimuth surveying, it has become apparent that most rocks are azimuthally anisotropic, with P-wave velocities and P-AVO gradients varying with source-receiver azimuth. What this means is that analysis of such data with narrow-azimuth algorithms and concepts will necessarily fail to get the most out of this expensively acquired data. The issues include not only seismic wave propagation, but also seismic rock physics. Isotropic concepts including velocity, Young’s modulus, and Poisson’s ratio have no place in the discussion of anisotropic rocks, unless qualified in some directional way (e.g., vertical Young’s modulus). Likewise, fluid substitution in anisotropic rocks, using the isotropic Biot/Gassmann formula, leads to formal errors, because the bulk modulus does not appear, in a natural way, within the anisotropic P-wave velocity. This updated edition is now current as of 2014.
Seismic Wave Propagation In Anisotropic Waveguides
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Author : Min Lou
language : en
Publisher:
Release Date : 1992
Seismic Wave Propagation In Anisotropic Waveguides written by Min Lou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Anisotropy categories.
Anisotropic Seismic Wave Propagation
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Author : Joe A. Dellinger
language : en
Publisher:
Release Date : 1991
Anisotropic Seismic Wave Propagation written by Joe A. Dellinger and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Elastic waves categories.
Copyright by the author.
Seismic Wave Propagation In Anisotropic Waveguides
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Author : Min Lou
language : en
Publisher:
Release Date : 1992
Seismic Wave Propagation In Anisotropic Waveguides written by Min Lou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Seismic waves categories.
Investigation Of Seismic Wave Propagation In Anisotropic And Inhomogeneous Media
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Author : Charles R. Bentley
language : en
Publisher:
Release Date : 1974
Investigation Of Seismic Wave Propagation In Anisotropic And Inhomogeneous Media written by Charles R. Bentley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with categories.
The purpose of this grant was to investigate some of the effects of anisotropy and inhomogeneity on the propagation of seismic waves by theoretical analysis and comparison with seismograms from the Antarctic ice sheet. Four specific topics were considered: (1) reflection coefficients at an isotropic-anisotropic boundary, (2) surface wave propagation in the presence of a strong velocity gradient, (3) conversion between body wave types upon total internal reflection, that is at the turning point of a refracted arrival, and (4) the continuous bodily conversion of P waves into shear waves in the course of propagation through a strong velocity gradient.
Propagation Of Transient Elastic Waves In Stratified Anisotropic Media
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Author : J.H.M.T. van der Hijden
language : en
Publisher: Elsevier
Release Date : 2016-05-24
Propagation Of Transient Elastic Waves In Stratified Anisotropic Media written by J.H.M.T. van der Hijden and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-05-24 with Science categories.
Seismic waves are one of the standard diagnostic tools used to determine the mechanical parameters (volume density of mass, compressibility, elastic stiffness) in the interior of the earth and the geometry of subsurface structures. There is increasing evidence that in the interpretation of seismic data - especially shear-wave data - the influence of anisotropy must be taken into account.This volume presents a method to compute the seismic waves that are generated by an impulsive source in a stratified anisotropic medium. Although written with the seismic applications in mind, the method that is developed is not limited to solid-earth geophysics. In fact, the methods discussed in this monograph are applicable wherever waves propagate in stratified, anisotropic media. The standard approach to this problem is to employ Fourier transformations with respect to time and with respect to the horizontal spatial coordinates. To obtain numerical results, the relevant inverse transformations then have to be evaluated numerically. In this monograph the problem is, in contrast to the standard approach, solved by applying the Cagniard-de Hoop method and by representing the wave field as a sum of generalized rays. With this method, the computational results can be obtained relatively easily with any degree of accuracy, and with considerably less computation time. For completeness, analysis of acoustic waves in stratified isotropic media is included. Furthermore, for large horizontal or vertical source-receiver separations very efficient approximations are derived. Several examples and applications are given.
Fundamentals Of Seismic Wave Propagation
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Author : Chris Chapman
language : en
Publisher: Cambridge University Press
Release Date : 2004-07-29
Fundamentals Of Seismic Wave Propagation written by Chris Chapman and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-07-29 with Science categories.
Fundamentals of Seismic Wave Propagation, published in 2004, presents a comprehensive introduction to the propagation of high-frequency body-waves in elastodynamics. The theory of seismic wave propagation in acoustic, elastic and anisotropic media is developed to allow seismic waves to be modelled in complex, realistic three-dimensional Earth models. This book provides a consistent and thorough development of modelling methods widely used in elastic wave propagation ranging from the whole Earth, through regional and crustal seismology, exploration seismics to borehole seismics, sonics and ultrasonics. Particular emphasis is placed on developing a consistent notation and approach throughout, which highlights similarities and allows more complicated methods and extensions to be developed without difficulty. This book is intended as a text for graduate courses in theoretical seismology, and as a reference for all academic and industrial seismologists using numerical modelling methods. Exercises and suggestions for further reading are included in each chapter.
Simulation Of Anisotropic Wave Propagation In Vertical Seismic Profiles
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Author :
language : en
Publisher:
Release Date : 2002
Simulation Of Anisotropic Wave Propagation In Vertical Seismic Profiles written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
The influence of elastic anisotropy on seismic wave propagation is often neglected for the sake of simplicity. However, ignoring anisotropy may lead to significant errors in the processing of seismic data and ultimately in a poor image of the subsurface. This is especially true in wide-aperture Vertical Seismic Profiles where waves travel both vertically and horizontally. Anisotropy has been neglected in wavefront construction methods of seismic ray-tracing until Gibson (2000), who showed they are powerful tools to simulate seismic wave propagation in three-dimensional anisotropic subsurface models. The code is currently under development using a C++ object oriented programming approach because it provides high flexibility in the design of new components and facilitates debugging and maintenance of a complex algorithm. So far, the code was used to simulate propagation in homogeneous or simple heterogeneous anisotropic velocity models mainly designed for testing purposes. In particular, it has never been applied to simulate a field dataset. We propose here an analytical method involving little algebra and that allows the design of realistic heterogeneous anisotropic models using the C++ object oriented programming approach. The new model class can model smooth multi-layered subsurface with gradients or models with many dip variations. It has been used to model first arrival times of a wide-aperture VSP dataset from the Gulf of Mexico to estimate the amount of anisotropy. The proposed velocity model is transversely isotropic. The anisotropy is constant throughout the model and is defined via Thomsen's parameters. Values in the final model are epsilon = 0.055 and delta = -0.115. The model is compatible with the a priori knowledge of the local geology and reduces the RMS average time difference between measured and computed travel times by 51% in comparison to the initial isotropic model. These values are realistic and are similar to other measurements of anisotropy in the Gulf of Mexico.