Method for aquiring and processing marine seismic data to extract and constructively use the up-going and down-going wave-fields emitted by the source(s)
First Claim
1. A method for acquisition and processing of marine seismic signals to extract up-going and down- going wave-fields from a seismic energy source, the method comprising:
- deploying at least two marine seismic energy sources at different depths in a body of water and at substantially a same longitudinal position from a seismic vessel;
actuating each of the seismic energy sources in a plurality of firing sequences, each sequence having a known, different time delay between firing each source and a start of seismic signal recording;
recording seismic signals corresponding to each firing sequence;
extracting seismic energy corresponding to each of the sources from the recorded seismic signals; and
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extracting at least one of an up-going and a down-going wave-field using the extracted seismic energy therefrom.
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Accused Products
Abstract
A method for acquisition and processing of marine seismic signals to extract up-going and down- going wave-fields from a seismic energy source includes deploying at least two marine seismic energy sources at different depths in a body of water. These seismic energy sources are actuated with known time delays that are varied from shot record to shot record. Seismic signals from sources deployed at different depths are recorded simultaneously. Seismic energy corresponding to each of the sources is extracted from the recorded seismic signals. Up-going and down-going wave-fields are extracted from the sources deployed at different depths using the extracted seismic energy therefrom. A method includes the separated up-going and down-going wave-fields are propagated to a water surface or a common reference, the up-going or the down-going wave-field is 180 degree phase shifted, and the signals from these modified up-going and down-going wave-fields are summed.
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Citations
20 Claims
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1. A method for acquisition and processing of marine seismic signals to extract up-going and down- going wave-fields from a seismic energy source, the method comprising:
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deploying at least two marine seismic energy sources at different depths in a body of water and at substantially a same longitudinal position from a seismic vessel; actuating each of the seismic energy sources in a plurality of firing sequences, each sequence having a known, different time delay between firing each source and a start of seismic signal recording; recording seismic signals corresponding to each firing sequence; extracting seismic energy corresponding to each of the sources from the recorded seismic signals; and
;extracting at least one of an up-going and a down-going wave-field using the extracted seismic energy therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for marine seismic surveying, comprising:
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separating up-going and down-going wave-fields from seismic energy emitted by at least one marine seismic energy source; propagating the separated up-going and down-going wave-fields from the at least one source to at least one of a water surface and a common reference depth; 180 degree phase shifting one of the up-going and down-going wave-field; and summing the propagated, phase shifted up-going and down-going wave-fields. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method for marine seismic surveying using at least two seismic energy sources operated at different depths and at substantially a same source geodetic position, comprising:
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separating energy from each of the sources from the recorded signals; separating up-going and down-going wave-fields corresponding to each source from the separated energy; propagating the separated up-going and down-going wave-fields from each source to at least one of a water surface and a common reference depth; 180 degree phase shifting one of the propagated wave-fields; and summing the phase shifted, propagated wave-fields. - View Dependent Claims (17, 18, 19, 20)
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Specification