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AVO, AVAZ Responses and Velocity Anisotropy Associated with Low-Frequency Anomalies-Example from the Southern North SeaNormal access

Authors: S.S. Ahmad, W.W. Weibull, R.J. Brown and A. Escalona
Event name: 80th EAGE Conference and Exhibition 2018
Session: Student Poster: Rock Physics, Seismic Reservoir
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201801724
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 453.74Kb )
Price: € 20

Summary:
Low-frequency amplitude anomalies above and below the faulted and fractured silty shales of the Hordaland Gp have been investigated using the Gabor-Morlet transform for spectral decomposition. For this purpose, a 3D broadband seismic dataset from the Hod field in the southern North Sea was used. Attribute analysis on the available broadband seismic data reveals that most of the faults at the level of the Hordaland Gp strike along the inline of the seismic data. Time-frequency analysis and spectral sections show that the faulted and fractured Hordaland Gp exhibits low-frequency anomalies only where it is hydrocarbon-bearing. After analyzing prestack and poststack seismic data in different azimuths, we do not see much variation in reflectivity at the level of low-frequency anomalies. Velocity analysis in different azimuths shows velocity anisotropy at the level of low-frequency anomalies.


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