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Abstract

Summary

The Interface Fresnel Zone (IFZ) concept plays an important role in seismic exploration, as the IFZ largely contributes to the formation of the reflection and transmission wavefields at an observation point.

Analytical derivations based on approximations of traveltimes are used to evaluate the IFZ size for (non-) converted waves reflected by a curved interface between dip-constrained transversely isotropic media. The reflectors are of anticline, syncline, or saddle type. In an anisotropic medium the isochron assumes in most cases a non-elliptical shape. The size and the shape of the IFZ for reflected waves are found to be predominantly dependent on the curvatures of the isochrons together with the curvatures of the interface. The IFZ shapes also exhibit large variation with interface curvature and incidence angle. In addition, the difference between the P-wave anisotropy and the near-vertical anisotropy is found to affect the size of the IFZ. The IFZ for anisotropic media can be much larger than that for equivalent isotropic media. The spatial resolution of unmigrated seismic data in anisotropic media in contact at a curved interface would consequently be significantly different from that determined for the same configuration if the media were assumed to be isotropic and/or the interface plane.

© EAGE Publications BV
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/content/papers/10.3997/2214-4609.20141229
2014-06-16
2024-04-26

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.20141229
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Interface Fresnel Zone for Reflected Waves from a Curved Interface in Anisotropic Media
Conference Proceedings 2014, 1 (2014); https://doi.org/10.3997/2214-4609.20141229
/content/papers/10.3997/2214-4609.20141229
/content/papers/10.3997/2214-4609.20141229
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