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Spectral Analysis of Post-imaging Seismic DataNormal access

Authors: A. Khalil, H. Hoeber, B. Deschizeaux and S. Campbell
Event name: 77th EAGE Conference and Exhibition 2015
Session: Transforms in Seismic Signal Processing
Publication date: 01 June 2015
DOI: 10.3997/2214-4609.201413414
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 2.07Mb )
Price: € 20

A migrated seismic image represents the spatially variable reflectivity of the medium where migration effectively rotates the wavelet to be normal to the imaged reflectors. While this is the general case, it is often disregarded, and one-dimensional spectral analysis of the vertical coordinate is commonly used. We show that spectral processing of post-imaging data in the direction normal to the reflectors provides accurate results for steep and complex structures. We introduce the concept of Orthogonal-Image-Gathers (OIGs) which facilitate this approach while providing a platform for handling spatially variable spectral distortions due to the velocity field and other medium-related properties.

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