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4D AVO: Multi-Vintage Amplitude Versus Offset Analysis
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 81st EAGE Conference and Exhibition 2019, Jun 2019, Volume 2019, p.1 - 7
Abstract
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.