Method of identification of non-primary events in seismic data
AssigneePGS Americas, Inc.
InventorRoald G. van Borselen
Life of this patent
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Abstract
A method is disclosed for identifying primary events in seismic data. The method includes sorting the data by frequency so that at least some primary events are separated from non-primary events, thus generating a frequency sorted gather. Amplitudes in the frequency sorted gather above a selected base amplitude are attenuated. The events are then coherency filtered and the attenuated amplitudes are replaced with amplitudes corresponding to the coherent events.
Claims18
A method of identification of primary events in seismic data, the method comprising:
- sorting the data by frequency wherein at least some non-primary events are separated from primary events, wherein a frequency sorted gather of data results;
- attenuating in the frequency-sorted gather amplitudes above a pre-selected base amplitude, wherein attenuated amplitudes result;
- applying a coherency filter to the events, wherein coherent events are identified;
- and
- replacing the attenuated amplitudes in the frequency-sorted gather with amplitudes corresponding to the coherent events.
A method of identification of primary events in seismic data, the method comprising:
- sorting the data by frequency wherein at least some non-primary events are separated from primary events, wherein a frequency-sorted gather of data results;
- applying a coherency filter to the events, wherein coherent events are identified;
- and
- attenuating in the frequency-sorted gather amplitudes above a pre-selected base amplitude which are not associated with the coherent events, wherein attenuated amplitudes result.
A system of identification of primary events in seismic data, the method comprising:
- means for sorting the data by frequency wherein at least some non-primary events are separated from primary events, wherein a frequency-sorted gather of data results;
- means for attenuating in the frequency-sorted gather amplitudes above a pre-selected base amplitude, wherein attenuated amplitudes result;
- means for applying a coherency filter to the events, wherein coherent events are identified;
- and
- means for replacing with amplitudes from the coherent events attenuated amplitudes in the frequency-sorted gather corresponding to the coherent events.
A system of identification of primary events in seismic data, the system comprising:
- means for sorting the data by frequency wherein at least some non-primary events are separated from primary events, wherein a frequency-sorted gather of data results;
- means for applying a coherency filter to the events, wherein coherent events are identified;
- and
- means for attenuating in the frequency-sorted gather amplitudes above a pre-selected base amplitude which are not associated with the coherent events, wherein attenuated amplitudes result.
A method of identifying primary events in seismic data, the method comprising:
- sorting the seismic data according to frequency;
- applying a coherency filter to the seismic data;
- and
- selectively attenuating events in the seismic data, wherein the selectively attenuating is dependent upon the frequency and coherency of events identified by the coherency filtering.
A system for identifying primary events in seismic data comprising:
- means for sorting the seismic data according to frequency;
- means for coherency filtering the seismic data;
- and
- means selectively attenuating events in the seismic data, the means for selectively attenuating dependent upon the frequency and coherency of events determined by the means for coherency filtering.
Dependencies are inferred from the claim text.