Variations in amplitude with offset are routinely being incorporated into our inversion products in order to differentiate lithology and fluids for increasingly complicated exploration and production projects. Commonly derived inversion products are acoustic impedance (AI) along with shear impedance (SI) or Poisson's ratio (σ). Density is also often derived separately with decreased reliability however, due to the dependence on accurate far-offset amplitudes beyond 30° for a stable result. The AI and SI attributes which may be determined with offset ranges up to 30° are in turn regularly crossplotted to investigate discrimination between differing lithology and fluid types.

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