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Salt-Related Converted-Wave Attenuation – a Deep-Water ExampleNormal access

Authors: M. Hegazy, A. Stewart, S. Hydal, K. Malave, O. Zdraveva and O. Mataracioglu
Event name: 80th EAGE Conference and Exhibition 2018
Session: Seismic Imaging - Case Histories I
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201800660
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 865.73Kb )
Price: € 20

Summary:
Complex shallow salt canopies, such as those found in offshore basins in the Gulf of Mexico, Brazil, and West Africa often suffer poor illumination, which results in poor subsalt imaging. The geometry of subsalt horizons truncating against the base of salt often determines if a trap exists and if it will be economically viable. It is, therefore, important to get an accurate image in these areas to reduce the seismic uncertainty. Unfortunately, the presence of converted mode energy can add spurious complexity to the subsalt image and degrade subsalt target interpretation. A novel C-wave attenuation workflow is introduced to address the C-wave energy. Synthetic and field data examples show a significant improvement in the image interpretability and demonstrates the importance of this application to earth model building and amplitude variation with offset AVO work


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