Schlumberger

SWIPE: Shifted Apex PRT Demultiple

Enhanced multiple attenuation for complex multiples

Historically, the Radon demultiple process was limited to attenuation of multiples where the apex of the parabola occurred at zero offset. However, this assumption is not appropriate in areas characterized by highly rugose water bottoms or steep crossline dips. These generate various types of multiple, notably side-scattered, diffracted, and some peg-leg multiples that have non-zero offset apexes. In this situation, conventional PRT demultiple generally fails to remove the part of the multiple near the apex, and the residual multiple contaminates the stack.

SWIPE (also known as NZOAR), the Schlumberger shifted-apex PRT demultiple technique, allows all events to be properly modeled, and hence, improves the separation between primary and multiples for a wider range of multiple energy. The result is enhanced multiple attenuation compared to other more conventional methods.

SWIPE benefits from the same high-resolution transform used in our Weighted Least-Squares (WLS) Radon Demultiple. It handles more than one parabola simultaneously such that several different multiple modes can be modeled in a single pass.

The best results from SWIPE depend on optimal parameterization. Schlumberger geophysicists have built experience across many of the world's major petroleum basins including the Gulf of Mexico, the North Sea, Southeast Asia, and offshore West Africa.

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