Methods for acquiring and processing seismic data from quasi-simultaneously activated translating energy sources
First Claim
1. A method for obtaining seismic data comprising the steps of:
- translating a constellation of seismic energy sources along a survey path, the seismic energy sources including a reference energy source and at least one satellite energy source;
translating along the survey path a streamer of spaced apart receivers, wherein the receivers are disposed generally in a linear alignment along a predetermined length of the streamer;
positioning the at least one satellite energy source in a perpendicular displacement to the direction of the streamer of receivers to provide a plurality of azimuthal coverage, wherein the at least one satellite energy source is located laterally outboard from the streamer at a distance of at least one-tenth of the length of the streamer; and
activating the reference energy source and the at least one satellite energy source at a time delay relative to the activation of the reference energy source once each at spaced part activation locations along the survey path to generate a series of superposed wavefields which propagate through a subsurface and are reflected from and refracted through material heterogeneities in the subsurface, the time delay being varied between the spaced apart activation locations; and
recording seismic data including seismic traces generated by the series of superposed wavefields utilizing the spaced apart receivers.
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Abstract
A method for obtaining seismic data is disclosed. A constellation of seismic energy sources is translated along a survey path. The seismic energy sources include a reference energy source and a satellite energy source. The reference energy source is activated and the satellite energy source is activated at a time delay relative to the activation of the reference energy source. This is repeated at each of the spaced apart activation locations along the survey path to generate a series of superposed wavefields. The time delay is varied between each of the spaced apart activation locations. Seismic data processing comprises sorting the traces into a common geometry domain and replicating the traces into multiple datasets associated with each particular energy source. Each trace is time adjusted in each replicated dataset in the common-geometry domain using the time delays associated with each particular source. This result in signals generated from that particular energy source being generally coherent while rendering signals from the other energy source is generally incoherent. The coherent and incoherent signals are then filtered to attenuate incoherent signals.
124 Citations
7 Claims
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1. A method for obtaining seismic data comprising the steps of:
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translating a constellation of seismic energy sources along a survey path, the seismic energy sources including a reference energy source and at least one satellite energy source; translating along the survey path a streamer of spaced apart receivers, wherein the receivers are disposed generally in a linear alignment along a predetermined length of the streamer; positioning the at least one satellite energy source in a perpendicular displacement to the direction of the streamer of receivers to provide a plurality of azimuthal coverage, wherein the at least one satellite energy source is located laterally outboard from the streamer at a distance of at least one-tenth of the length of the streamer; and activating the reference energy source and the at least one satellite energy source at a time delay relative to the activation of the reference energy source once each at spaced part activation locations along the survey path to generate a series of superposed wavefields which propagate through a subsurface and are reflected from and refracted through material heterogeneities in the subsurface, the time delay being varied between the spaced apart activation locations; and recording seismic data including seismic traces generated by the series of superposed wavefields utilizing the spaced apart receivers. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification