Method and system for acquiring marine seismic data using multiple seismic sources
CAFCFirst Claim
1. A method for seismic surveying, comprising:
- towing a first seismic energy source and at least one seismic sensor system;
towing a second seismic energy source at a selected distance from the first seismic energy source; and
actuating the first seismic energy source and the second seismic energy source in a plurality of firing sequences, each of the firing sequences including firing of the first source and the second source and recording signals generated by the at least one seismic sensor system, a time interval between firing the first source and the second source varied between successive ones of the firing sequences, the times of firing the first and second source indexed so as to enable separate identification of seismic events originating from the first source and seismic events originating from the second source in detected seismic signals.
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3 Petitions
Accused Products
Abstract
A method for seismic surveying is disclosed which includes towing a first seismic energy source and at least one seismic sensor system. A second seismic energy source is towed at a selected distance from the first source. The first seismic energy source and the second seismic energy source are actuated in a plurality of firing sequences. Each of the firing sequences includes firing of the first source, waiting a selected time firing the second source and recording signals generated by the seismic sensor system. The selected time between firing the first source and the second source is varied between successive ones of the firing sequences. The firing times of the first and second source are indexed so as to enable separate identification of seismic events originating from the first source and seismic events originating from the second source in detected seismic signals.
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Citations
38 Claims
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1. A method for seismic surveying, comprising:
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towing a first seismic energy source and at least one seismic sensor system;
towing a second seismic energy source at a selected distance from the first seismic energy source; and
actuating the first seismic energy source and the second seismic energy source in a plurality of firing sequences, each of the firing sequences including firing of the first source and the second source and recording signals generated by the at least one seismic sensor system, a time interval between firing the first source and the second source varied between successive ones of the firing sequences, the times of firing the first and second source indexed so as to enable separate identification of seismic events originating from the first source and seismic events originating from the second source in detected seismic signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A seismic surveying system, comprising:
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a first seismic energy source;
a second seismic energy source;
at least one seismic sensor array;
a vessel adapted to tow the first source, to tow the at least one seismic sensor array, and to tow the at least one second source at a selected distance from the first source; and
a controller adapted to actuate the first source and the second source in a plurality of firing sequences, the sequences having a time delay between firing the first source and the second source which varies between successive firing sequences, the times interval of firing the first and second source indexed so as to enable separate identification of seismic events originating from the first source and seismic events originating from the second source in detected seismic signals. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. A method for determining signal components attributable to a first seismic energy source and to a second seismic energy source in signals recorded from seismic sensors, the first and second sources and the sensors towed along a survey line, the first source and the second source fired in a plurality of sequences, a time delay between firing the first source and the second source in each firing sequence being different than the time delay in other ones of the firing sequences, the method comprising:
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determining a first component of the recorded signals that is coherent from shot to shot and from trace to trace;
time aligning die recorded signals with respect to a firing time of the second source in each firing sequence; and
determining a second component of the signals that is coherent from shot to shot and from trace to trace in the time aligned signals. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38)
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Specification