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Kirchhoff Migration, Demigration and Seismic Modeling by Demigration
Matthias Riede
ISBN 978-3-89722-886-3
120 pages, year of publication: 2002
price: 40.50 €
Kirchhoff depth migration is a familiar process to transform seismic data
measured at the surface into the depth domain in order to obtain an image of
the subsurface. For a long time, it was believed that the inverse process to
depth migration is Kirchhoff modeling. A closer look however, reveals that a
new process has to be introduced as the actual mathematical correct inverse to
depth migration, namely demigration. The formulation of an asymptotic inverse
integral pair leads to a unique tool to perform various kinds of image
transformation.Unfortunately, this approach still lacks the possibility of modeling, which is not possible straightforward with the demigration process. In this book, a new modeling technique is presented using demigration. Thus for the first time, a link is established between Kirchhoff reflection imaging and seismic forward modeling.
Compared to convetional modeling methods, modeling by demigration makes efficient use of the time-invariant parameters of a subsurface model and therefore the method is especially well suited for modeling time-lapse scenarios.
This book reviews on the one hand the underlying theory for the mentioned image transformations and focuses on the other hand on the development of a practical tool to perform modeling by demigration. applications of seismic image transformations using both migration and demigration as well as applications of modeling by demigration are presented.