Hyperion removes multiples using a time-domain Radon transform that fits data using curves having a normal-moveout trajectory. It has the following features:
- Executes quickly.
- Has “primary weighting”, a type of high-resolution transform which prevents damage to primary energy.
- Works from non-NMOed data, making it less prone to damage due to NMO stretch than Radon transforms that work from NMO-corrected data. This means that more offsets may be used, increasing the resolution of the transform.
- Works in the time domain, so that it is not distorted by muted zones.
- Parameter selection is easy. No τ-p picking is required.
- Preserves AVO effects.
- Super gathers are supported. This feature adapts to the fold, so that a super gather might include many gathers at the survey boundary, and a few or one in the interior.
- Can specifically target water-column multiples, those strong multiples that bounce between the water surface and water bottom without reflecting within the earth.
- Handles higher-order (that is, non-hyperbolic) normal-moveout curves.
A limitation of this and all Radon transform methods is that a multiple must have a lower moveout velocity than the primary at the same zero-offset time to be safely removable.
UnNMOed synthetic data demonstrating the ability of
Hyperion to cleanly separate primary and multiple.
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References
Hampson, D., 1986, Inverse velocity stacking for multiple elimination: Journal of the Canadian Society of Exploration Geophysicists, 22, 44-55.
Kabir, M., M. Nurul, and K. J. Marfurt, 1999, Toward true amplitude multiple removal: The Leading Edge, 18, 66-73.
Sacchi, M. D. and Ulrych, T. J., 1995. High resolution velocity gathers and offset- space reconstruction: Geophysics, 60, 1169-1177.
Sacchi, M. D., 1999, Fast high resolution parabolic Radon transform: SEG Expanded Abstracts, 1477-1480.
Thorson, J. R. and J. F. Claerbout, 1985, Velocity-stack and slant-stack stochastic inversion: Geophysics, 50, 2727-2741.