Multiple Attenuation
Interbed multiples represent one of the thorniest problems in land processing, and although the problem may never be outright solved, our state-of-the-art interbed multiple tools go a long way towards the effective removal of undesirable reverberatory energy.
RADON – High resolution (parabolic & linear) Radon transform demultiple
RADON, our high resolution Radon demultiple tool, is our workhorse tool for internal multiple elimination.
The algorithm is based on the pioneering work of Sacchi and Ulrych (1995) and the underlying inverse problem essentially enforces sparsity in the Radon domain in order to facilitate differentiation between primary and fast interbed energy. Because subtle velocity discrimination lies at the heart of the Radon-based internal multiple approach, we have augmented this basic algorithmic kernel with a graphical interface to allow easy specification of time and space variant Radon filter masks.
Click below to view a demo of our interactive Radon tool.
The figure below shows a snapshot of our interactive Radon tool in action. Note that the user is targeting a fast interbed multiple in the zone-of-interest, and has accordingly chosen a time-variant mute which is quite aggressive in the zone but is gentle elsewhere.
ICone™ - Intelligent Coherent Noise Elimination
ICone™, our trajectory-scan algorithm which was originally conceived for linear noise rejection, may also be used for internal multiple elimination. The internal multiple implementation of ICone™ essentially seeks to remove energy which exhibits coherence along parabolic trajectories. Of particular interest is the fact that it can overcome the well-known ‘constant amplitude along parabolae’ limitation associated with Radon-based demultiple techniques. ICone™’s ability to tolerate amplitude variation with offset stems from the fact that the multiple identification kernel operates in small spatio-temporal windows and thereby provides spatial localization across the offset dimension. Data results to-date are very encouraging; moreover, we are hopeful that the technique will serve as a launching pad for new-generation local Radon demultiple approaches.
