Method for removing noise due to near surface scatterers
AssigneeWestern Atlas International, Inc.
InventorRonald E. Chambers
Life of this patent
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Abstract
A set of raw common shot gathers are resorted as common receiver gathers. The wavefield envelopes from the common receiver gathers are migrated using one half the near-surface velocity to provide migrated data sets. The migrated data sets are resorted back into common shot gathers and subtracted from the original raw common shot gathers to provide coherent-noise-reduced data sets.
Claims4
In an acoustic data set, a method for reducing coherent noise contamination from shallow scatterers, comprising:
- measuring the near surface velocity;
- providing a suite of raw common source gathers displaying acoustic waveform envelopes;
- enhancing the imagery of the waveform envelopes due to shallow acoustic scatterers at the expense of deep-seated acoustic reflection data by
- (1) time-shifting said waveform envelopes in proportion to the source/receiver traveltime,
- (2) migrating the time-shifted waveform envelopes using the measured near-surface velocity;
- sorting the image-enhanced common source gathers to common receiver gathers;
- array-forming said common receiver gathers to generate combined common receiver gathers;
- resorting said combined common receiver gathers to combined common source gathers;
- reconstituting said combined common source gathers;
- and
- subtracting the reconstituted resorted combined common source gathers from said suite of raw common source gathers.
A method for reducing coherent noise contamination, due to near-surface scatterers, from an acoustic data set, comprising:
- providing a suite of raw common source gathers displaying acoustic waveform envelopes;
- measuring the near-surface velocity;
- sorting said common source gathers to common receiver gathers;
- enhancing the imagery of the waveform envelopes due to near-surface scatterers at the expense of deep-seated acoustic reflection data by time shifting said common receiver gathers in proportion to the differential distance between sources using said measured near-surface velocity;
- array-forming the time-shifted common receiver gathers to form combined common receiver gathers;
- resorting said combined common receiver gathers to combined common source gathers;
- reconstituting the resorted combined common source gathers;
- and
- subtracting the reconstituted resorted combined common source gathers from said suite of raw common source gathers.
Dependencies are inferred from the claim text.