Seismic acquisition using phase-shifted sweeps
AssigneeWesternGeco L.L.C.
InventorsDAVID FRASER HALLIDAY, ROBERT MONTGOMERY LAWS
Life of this patent
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Abstract
A technique includes towing at least one seismic source in connection with a survey of a structure; and operating the seismic source(s) to fire shots, where each shot is associated with a frequency sweep. The technique includes varying phases of the frequency sweeps from shot to shot according to a predetermined phase sequence to allow noise in an energy sensed by seismic sensors to be attenuated.
Claims21
A method comprising:
- towing at least one seismic source in connection with a survey of a geologic structure;
- operating the at least one seismic source to fire shots, each shot being associated with a frequency sweep;
- and
- varying phases of the frequency sweeps from shot to shot according to a predetermined phase sequence to allow noise in an energy sensed by seismic sensors to be attenuated.
A method comprising:
- receiving data acquired by sensors, the data being representing energy sensed by the sensors resulting from source energy from at least one seismic source interacting with a structure, wherein the at least one seismic source is operated to fire shots, each shot being associated with a frequency sweep, and phases of the frequency sweeps varying from shot to shot according to a predetermined phase sequence;
- and
- processing information derived from the data by a processor-based machine in an application that relies on attenuation of noise present in the energy sensed by the sensors.
An apparatus comprising:
- an interface to receive data acquired by sensors, the data being representing energy sensed by the sensors resulting from source energy from at least one seismic source interacting with a structure, wherein the at least one seismic source is operated to fire shots, each shot being associated with a frequency sweep, and phases of the frequency sweeps varying from shot to shot according to a predetermined phase sequence;
- and
- a processor to process information derived from the data by a processor-based machine in an application that relies on attenuation of noise present in the energy sensed by the sensors.
An article comprising a non-transitory computer readable storage medium storing instructions that when executed by a computer cause the computer to:
- receive data acquired by sensors, the data being representing energy sensed by the sensors resulting from source energy from at least one seismic source interacting with a structure, wherein the at least one seismic source is operated to fire shots, each shot being associated with a frequency sweep, and phases of the frequency sweeps varying from shot to shot according to a predetermined phase sequence;
- and
- process information derived from the data in an application that relies on attenuation of noise present in the energy sensed by the sensors.
Dependencies are inferred from the claim text.