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US 2014/0369164 A1Published application
Removing noise from a seismic measurement
AssigneeWesternGeco L.L.C.
InventorsJAMES EDWARD MARTIN, AHMET KEMAL ÖZDEMIR, BENT ANDREAS KJELLESVIG, ALI OZBEK
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Abstract
A technique includes spatially filtering a signal that is derived from a seismic acquisition. The filtering is associated with a filter length, and the filtering includes varying the filter length with frequency. The filtering may be used in connection with adaptive noise attenuation, which is applied to decomposed subbands. Furthermore, the filtering may be applied during the reconstruction of the signal from the subbands.
Claims18
A method comprising:
- decomposing a signal derived from a seismic acquisition into subbands in successive stages, the subbands being associated with at least different frequency ranges of the signal;
- selectively applying adaptive noise attenuation in between the successive stages such that the stages decompose noise-attenuated subbands;
- and
- reconstructing the signal from the subbands resulting from the decomposition.
1 more element
A system comprising:
- an interface to receive data indicative of a signal derived from a seismic acquisition;
- and
- a processor to:
- decompose the signal into subbands in successive stages, the subbands being associated with at least different frequency ranges of the signal;
- selectively apply adaptive noise attenuation in between the successive stages such that the stages decompose noise-attenuated subbands;
- and
- reconstruct the signal from the subbands resulting from the decomposition.
4 more elements
A method comprising:
- filtering a signal derived from a seismic acquisition;
- and
- mitigating edge effects in connection with the filtering, the mitigating comprising using autoregressive modeling to extrapolate the signal beyond an acquisition geometry to form an extrapolated signal and performing variable length spatial filtering on the extrapolated signal.
A method comprising:
- providing an n dimensional FIR filter formed from a plurality of n−1 dimension FIR filters;
- and
- spatially filtering a signal derived from a seismic acquisition in n dimensions using the plurality of n−1 dimensional FIR filters to generate a filtered signal.
Dependencies are inferred from the claim text.