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f Azimuthally varying AVO response for fractured reservoirs
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 58th EAGE Conference and Exhibition, Jun 1996, cp-48-00240
- ISBN: 978-90-73781-07-8
Abstract
The presence of vertical parallel cracks in an isotropic matrix leads to azimuthal anisotropy described by the transversely isotropic model with a horizontal axis of symmetry (HTI) (Cram pin, 1985). Azimuthal anisotropy has a first-order influence on shear waves that split into two components traveling with different velocities. The fractional difference between the velocities of split shear waves at vertical incidence (Thomsen's coefficientry) is close to the crack density, one of the most important reservoir parameters.