24 November 2015

In this E-Lecture Zvi Koren presents a novel imaging system for enriching (maximizing) information from the available recorded seismic data. The system is based on two stage imaging process composed of: 1. Mapping into the Local Angle Domain (LAD): Internal optimal beam forming and in situ full wavefield mapping and decomposition (binning) of the 5D recorded seismic data into the subsurface 7D LAD using a bottom-up ray-based migration operator. The resulted imaged dataset is organized and stored as 5D angle-domain common image gathers, where each depth point consists of two directional angles (apparent dip and azimuth) and two scattering angles (opening angle and opening azimuth). 2. LAD-based Conditioning and Processing: mute, data reconstruction, Q compensation LAD-based Imaging: Ability to selectively enhance structural model continuity (specular energy imaging) and high resolution discontinuous objects: small faults and fracture systems (diffraction imaging) or near vertical walls (corner-waves imaging) directly from the 5D LAD gathers It is shown that the method enhances the data components associated with the seismic modelling used for the migration (e.g. primary P-waves) and simultaneously attenuates all other data characteristics (“noise”; “multiples”) in both data and space-angle domains.

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