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4D AVO: Multi-Vintage Amplitude Versus Offset AnalysisNormal access

Authors: T. Coleou, D. Riffault and C. Lacombe
Event name: 81st EAGE Conference and Exhibition 2019
Session: Time-Lapse Processing
Publication date: 03 June 2019
DOI: 10.3997/2214-4609.201901584
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 11.12Mb )
Price: € 20

Summary:
A seismic survey has up to five dimensions: the 3D cubes with inline, crossline and 2-way time (TWT) dimensions as well as offset and azimuth. With repeated measurements (4D seismic), there is an additional axis: the elapsed time. Time-lapse seismic data can then be seen as a six-dimensional volume or a 5D movie. In traditional pre-stack studies, amplitude is analyzed as a function of incidence angle (AVA) and/or azimuthal direction (AVAz). In this paper, we propose a tool to extend the analysis of the Amplitude Versus Offset (AVO) behavior in conjunction with the elapsed time dimension. The changes in AVO with elapsed time provides a data reduction, that can lead to a clean 4D response of the changes observed through the monitoring period. Its applications to various processing and interpretation processes are discussed in the paper.


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