Schlumberger

Model-Driven Interferometry (MDI)

Overview Library

Prediction and subtraction of complex high-order scattered surface waves from land seismic data

Removal of scattered surface waves from land seismic data is one of the most challenging aspects of seismic processing because of the complex nature of wave propagation in the near surface. Our model-driven interferometric ground-roll attenuation provides a solution using a modified form of seismic interferometry to predict and subtract scattered ground roll, surpassing conventional velocity discrimination techniques such as f-k filtering.

Ability to address common acquisition geometries

MDI modifies the classical interferometric method by replacing one of the interferometry inputs with a model of the direct ground roll. As a result, an estimate of the scattered ground roll can be made directly between a source and a receiver instead of between two receiver locations. This presents a significant advance over the conventional interferometric method, which could only work efficiently for certain types of impractical acquisition geometries.

We are now able to estimate and remove complex higher-order scattered surface waves for a number of common, modern 3D land acquisition geometries that allow the formation of appropriate enclosing boundaries from existing sources in the survey.

Improved confidence in final interpretation

With this flexibility, we can effectively attenuate the scattered ground roll, improving the signal response for both prestack and poststack data. Better signal continuity together with reduced noise contamination and signal distortion increase confidence in the final reservoir interpretation and inversion.

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