1887

Abstract

Shear waves may not behave uniformly for all directions of propagation in sedimentary basins. Splitting of seismic shear-waves (bi-refringence) is observed in many sedimentary basins, and appears to be caused by propagation through a combination of two phenomena: 1) the azimuthal isotropy of fine horizontal layering or Iithology, leading to transverse isotropy with a vertical axis of symmetry, and velocity anisotropy of anything up to 30 or 40%; and 2) the azimuthal anisotropy of stress-aligned fluid-fiIled cracks, microcracks, and preferentially oriented pore-space, leading to transverse isotropy with a horizontal axis of symmetry, and much weaker velocity anisotropy (often less than 5 %). The combination of the two transverse isotropies with orthogonal axes of summetry leads to an orthorhombic symmetry system.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201410907
1991-05-28
2020-09-20
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201410907
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error