Azimuthal Anisotropic Analysis

Multicomponent solutions for defining fractured reservoirs

WesternGeco has a broad portfolio of technologies targeted at detecting, quantifying, and compensating for azimuthal anisotropy. Interpretation of these analyses delivers detailed information on the anisotropy magnitude and directional variations. These, in turn, may relate to fracture density (fracture porosity) and orientation (directions of preferred permeability). Starting from the shallowest layer and working downwards by layer stripping, the anisotropy levels are determined independently and corrected for during the processing sequence.

Mode-converted anisotropic analysis

Shear waves are very sensitive to changes in azimuthal anisotropy, which may be induced by lithology, stress, or fractures because the shear wave is a transverse wave mode. Azimuthal anisotropy splits the reflected shear wave into two distinct orthogonal waves. This shear splitting, caused by changes in the subsurface, can be analyzed and compensated for in a layer-stripping approach using our pre- or poststack tools.

Schlumberger offers a variety of both pre- and poststack tools for azimuthal anisotropy analysis using shear-wave information, including:

  • Supergather analysis
  • Common-offset ring analysis
  • 2C x 2C converted-wave Alford rotation analysis

P-wave Azimuthal Anisotropy Analysis

OBC and land acquisition configurations enable recording of seismic data across a rich distribution of azimuths. By splitting the data in limited-azimuth cubes, we are able to clearly analyze any azimuthal variations in P-wave amplitudes, velocities, and AVO effects.

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Pre-and Post-Stack Analysis Tools

Shear-wave azimuthal anisotropy analysis.
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