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dc.contributor.authorDewangan, P.
dc.contributor.authorTsvankin, I.
dc.contributor.authorBatzle, M.
dc.contributor.authorVan Wijk, K.
dc.contributor.authorHaney, M.
dc.date.accessioned2007-04-13T07:29:19Z
dc.date.available2007-04-13T07:29:19Z
dc.date.issued2006
dc.identifier.citationGeophysics, vol.71(4), D135-D143pp.
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/581
dc.description.abstractMode-converted PS-waves can provide critically important information for velocity analysis in transversely isotropic (TI) media. With physical-modeling data is demonstrated that the combination of long-spread reflection traveltimes of PP- and PS-waves can be inverted for the parameters of a horizontal TI layer with a tilted symmetry axis. The 2D multicomponent reflection data are acquired over a phenolic sample manufactured to simulate the effective medium formed by steeply dipping fracture sets or shale layers. The reflection moveout of PS-waves in this model is asymmetric with respect to the source and receiver positions, and the moveout-asymmetry attributes play a crucial role in constraining the TI parameters. Applying the modified PP + PS = SS method to the PP and PS traveltimes recorded in the symmetry-axis plane, computed the time and offset asymmetry attributes of the PS-waves along with the traveltimes of the pure SS reflections. The algorithm of Dewangan and Tsvankin is then used to invert the combination of the moveout attributes of PP-, SS-, and PS-waves for the medium parameters and the thickness of the sample. It should be emphasized that the pure-mode (PP and SS) traveltimes alone are insufficient for the inversion, even if 3D wide-azimuth data are available. The estimates of the symmetry axis tilt and layer thickness almost coincide with the actual values. The inverted model is also validated by reproducing the results of transmission experiments with both P- and S-wave sources. The transmitted SV wavefield exhibits a prominent cusp (triplication) accurately predicted by the parameter-estimation results
dc.format.extent830547 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherSociety of Exploration Geophysicists
dc.rights©2006 Society of Exploration Geophysicists. All rights reserved. Authors and publishers may present or republish up to two figures or tables per SEG article or per SEG book without seeking written permission from SEG, provided that full acknowledgment of the source is provided in the new work. SEG considers this fair use. There are no fees associated with this permission. Authors who need documentation that SEG is extending this permission are encouraged to print this message and present it to their publishers. Those who require further documentation should contact the SEG publications director. SEG recommends that authors and publishers who intend to reuse SEG figures or tables also seek consent of the original work’s lead author, if possible. The member search on the SEG Web site might prove a helpful resource in locating these authors. Requests to use any portion of “Seismic Data Analysis: Processing, Inversion, and Interpretation of Seismic Data” should be directed to the SEG publications director.
dc.subjectTransversely isotropic
dc.subjectTilted symmetry axis
dc.titlePS-wave moveout inversion for tilted TI media: A physical modeling study
dc.typeJournal Article


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