Advances in Exploration Geophysics S.
2 total works
Vol 2
Elastic Wave Field Extrapolation
by Cornelis Pieter Arie Wapenaar, C P a Wapenaar, and A.J. Berkhout
Published 17 October 1989
Extrapolation of seismic waves from the earth's surface to any level in the subsurface plays an essential role in many advanced seismic processing schemes, such as migration, inverse scattering and redatuming. At present these schemes are based on the acoustic wave equation. This means not only that S-waves (shear waves) are ignored, but also that P-waves (compressional waves) are not handled correctly. In the seismic industry there is an important trend towards multi-component data acquisition. For processing of multi-component seismic data, ignoring S-waves can no longer be justified. Wave field extrapolation should therefore be based on the full elastic wave equation. In this book the authors review acoustic one-way extrapolation of P-waves and introduce elastic one-way extrapolation of P - and S-waves. They demonstrate that elastic extrapolation of multi-component data, decomposed into P - and S-waves, is essentially equivalent to acoustic extrapolation of P-waves. This has the important practical consequence that elastic processing of multi-component seismic data need not be significantly more complicated than acoustic processing of single-component seismic data.
This is demonstrated in the final chapters, which deal with the application of wave field extrapolation in the redatuming process of single - and multi-component seismic data. Geophysicists, and anyone who is interested in a review of acoustic and elastic wave theory, will find this book useful. It is also a suitable textbook for graduate students and those following courses in elastic wave field extrapolation as each subject is introduced in a relatively simple manner using the scalar acoustic wave equation. In the chapters on elastic wave field extrapolation the formulation, whenever possible, is analogous to that used in the chapters on acoustic wave field extrapolation. The text is illustrated throughout and a bibliography and keyword index are provided.
This is demonstrated in the final chapters, which deal with the application of wave field extrapolation in the redatuming process of single - and multi-component seismic data. Geophysicists, and anyone who is interested in a review of acoustic and elastic wave theory, will find this book useful. It is also a suitable textbook for graduate students and those following courses in elastic wave field extrapolation as each subject is introduced in a relatively simple manner using the scalar acoustic wave equation. In the chapters on elastic wave field extrapolation the formulation, whenever possible, is analogous to that used in the chapters on acoustic wave field extrapolation. The text is illustrated throughout and a bibliography and keyword index are provided.
Vol 1
The recession in the oil industry, and in particular the exploration fields, has not deterred the industry from continued research into the improvement of its geophysical techniques. Latterly, there has been much emphasis on the interpretation of data, and on optimizing data processing systems. The new book series Advances in Exploration Geophysics will reflect the trends in both these areas as well as the new and important aspects of established subjects such as data acquisition, etc. The series will be edited by Professor Berkhout, who is also author of this first volume. In the last few years the role of wave theory in seismic processing has increased significantly; new wave theory solutions to old problems have been formulated with impressive success. In the near future the technology of seismic processing will be largely based on wave theory. This means that, in the coming years, emphasis will further shift from time series based techniques to wave theory based techniques. As a consequence, it is imperative that geophysicists have a thorough understanding of seismic wave theory in order to cope with the technology of tomorrow.