Weighted Least-Squares (WLS) Radon Demultiple

Multiple attenuation in the parabolic radon domain

Weighted Least-Squares (WLS) Radon transforms provide better attenuation of multiple energy compared to conventional Radon transforms. The use of a-priori information about the subsurface model enables events to be better focused in the Radon domain, improving identification and separation of signal and noise trends, and minimizing transform artifacts and aliasing effects.

Compared to other velocity discrimination techniques (e.g., fk demultiple), there is greater separation of primary and multiple events, enabling removing more multiple energy without affecting the underlying signal.

The WesternGeco weighted least-squares Radon implementation of WLS Radon Demultiple transforms is a robust technique. However, there are occasions when additional processing is required; remnant multiples can be attacked using SWIPE: Shifted Apex PRT Demultiple, PRIMAL or Cascaded Radon Demultiple, whereas for steeply dipping seafloors or areas of extreme crossline dip, a full 3D approach is required (3D-SMP).

Related references

• Moore I., Kostov C., Stable, efficient, high-resolution Radon transforms, 64th EAGE Conference and Technical Exhibition Expanded Abstracts, F034, 2002