Anisotropic reverse-time migration for tilted TI media

Autor:	Larry Lines, John C. Bancroft, Xiang Du
Rok vydání:	2007
Předmět:	Physics Seismic anisotropy business.industry Isotropy Seismic migration Geometry Acoustic wave Wave equation Geophysics Optics Geochemistry and Petrology Transverse isotropy Phase velocity business Anisotropy
Zdroj:	Geophysical Prospecting. 55:853-869
ISSN:	1365-2478 0016-8025
DOI:	10.1111/j.1365-2478.2007.00652.x
Popis:	Seismic anisotropy in dipping shales results in imaging and positioning problems for underlying structures. We develop an anisotropic reverse-time depth migration approach for P-wave and SV-wave seismic data in transversely isotropic (TI) media with a tilted axis of symmetry normal to bedding. Based on an accurate phase velocity formula and dispersion relationships for weak anisotropy, we derive the wave equation for P-wave and SV-wave propagation in tilted transversely isotropic (TTI) media. The accuracy of the P-wave equation and the SV-wave equation is analyzed and compared with other acoustic wave equations for TTI media. Using this analysis and the pseudo-spectral method, we apply reverse-time migration to numerical and physical-model data. According to the comparison between the isotropic and anisotropic migration results, the anisotropic reverse-time depth migration offers significant improvements in positioning and reflector continuity over those obtained using isotropic algorithms.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fa8accfed751bef90fb5b00c0947be26 https://doi.org/10.1111/j.1365-2478.2007.00652.x Zobrazit plný text záznamu Plný text