Amplitude variation with azimuth (AVAz) inversion of wide-azimuth surface seismic data is essential for characterizing fractured reservoirs that cover large areas. It estimates the elastic properties of the in-situ rock and can be used to derive fracture properties and stress anisotropy, both important for considerations related to field development and production. A fractured reservoir may have multiple vertical fracture sets and, as a result, the rock's elastic symmetry may be monoclinic. Thus, AVAz inversions based on reflectivity equations associated with higher symmetries will not be valid. Herein, we introduce monoclinic AVAz inversion and demonstrate it on a synthetic example based on the SEG advanced modeling program Phase II model.
|Number of pages||5|
|Journal||SEG Technical Program Expanded Abstracts|
|State||Published - 2020|
|Event||Society of Exploration Geophysicists International Exhibition and 90th Annual Meeting, SEG 2020 - Virtual, Online|
Duration: 11 Oct 2020 → 16 Oct 2020
- Reservoir characterization