Method and system for deghosting
AssigneePGS Americas, Inc.
InventorsJacob T. Fokkema, Peter M. van den Berg
Life of this patent
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Abstract
In one embodiment the invention comprises a method for receiving an acoustic wavefield beneath the surface of the water in which at least a portion of an acoustic wavefield is received at a first position, at least a portion of an acoustic wavefield is received at a second position, and at least a portion of an acoustic wavefield is received at a third position. The first position, the second position and the third position are triangularly positioned relative to one another. The first position is not directly above or below the second position or the third position, and the second position is not directly above or below the third position.
Claims101
A method for processing a scattered acoustic wavefield, at least a portion of which is received by at least two receivers, which are offset and located approximately at the same depth, the method comprising:
- transforming the scattered acoustic wavefield to the frequency domain;
- transforming the scattered acoustic wavefield from the frequency domain to the spectral domain;
- deghosting the scattered acoustic wavefield in the spectral domain;
- and
- transforming the substantially deghosted acoustic wavefield to the space-time domain.
A method for processing a scattered acoustic wavefield at least a portion of which is received by at least a first set of two receivers and a second set of two receivers, wherein the first set of two receivers are offset at substantially a first depth which is vertically offset from the a second set of two receivers which are offset at substantially a second depth, the method comprising:
- transforming the scattered acoustic wavefield received at the first depth to the frequency domain;
- transforming the scattered acoustic wavefield received at the second depth to the frequency domain;
- transforming the scattered acoustic wavefield received at the first depth from the frequency domain to the spectral domain;
- transforming the scattered acoustic wavefield received at the second depth from the frequency domain to the spectral domain;
- generating a substantially deghosted scattered acoustic wavefield in the spectral domain;
- transforming the substantially deghosted scattered acoustic wavefield to the space-time domain.
The method of claim 38, wherein said Fourier transform is dependent upon the number of receivers receiving the scattered acoustic wavefield.
A method for receiving acoustic wavefield beneath the surface of the water, the method comprising:
- receiving at least a portion of an acoustic wavefield at a first position;
- receiving at least a portion of an acoustic wavefield at a second position;
- and
- receiving at least a portion of an acoustic wavefield at a third position;
- wherein the first position, the second position, and the third position are triangularly positioned relative to one another and wherein the first position is not directly above or below the second position and wherein the first position is not directly above or below the third position;
- and
- wherein the second position is not directly above or below the third position.
A method of controlling the quality of seismic data acquisition substantially near the acquisition site, the method comprising:
- generating a scattered acoustic wavefield;
- receiving at least a portion of the scattered acoustic wavefield;
- substantially deghosting at least a portion of the scattered acoustic wavefield relatively near the acquisition site;
- and
- evaluating the quality of the substantially deghosted scattered acoustic wavefield.
A system for processing a scattered acoustic wavefield, at least a portion of which is received by at least two receivers, which are offset and located at approximately the same depth, the method comprising:
- means for transforming the scattered acoustic wavefield to the frequency domain;
- means for transforming the scattered acoustic wavefield from the frequency domain to the spectral domain;
- means for deghosting, the scattered acoustic wavefield in the spectral domain;
- and
- means for transforming the substantially deghosted acoustic wavefield to the space-time domain.
A system for processing a scattered acoustic wavefield at least a portion of which is received by at least a first set of two receivers and a second set of two receivers, wherein the first set of two receivers are offset at substantially a first depth which is vertically offset from at least a second set of two receivers which are offset at substantially a second depth, the system comprising:
- means for transforming the scattered acoustic wavefield received at the first depth to the frequency domain;
- means for transforming the scattered acoustic wavefield received at the second depth to the frequency domain;
- means for transforming the scattered acoustic wavefield received at the first depth from the frequency domain to the spectral domain;
- means for transforming the scattered acoustic wavefield received at the second depth from the frequency domain to the spectral domain;
- means for generating a substantially deghosted scattered acoustic wavefield in the spectral domain;
- and
- means for transforming the substantially deghosted scattered acoustic wavefield to the space-time domain
A system for receiving an acoustic wavefield beneath the surface of the water, the system comprising:
- means for receiving at least a portion of an acoustic wavefield at a first position;
- means for receiving at least a portion of an acoustic wavefield at a second position;
- and
- means for receiving at least a portion of an acoustic wavefield at a third position;
- wherein the first position, the second position, and the third position are triangularly positioned relative to one another and wherein the first position is not directly above or below the second position and wherein the first position is not directly above or below the third position;
- wherein the second position is not directly above or below the third position.
A system of controlling the quality of seismic data acquisition substantially near the acquisition site, the system comprising:
- means for generating a scattered acoustic wavefield;
- means for receiving at least a portion of the scattered acoustic wavefield;
- means for substantially deghosting the scattered acoustic wavefield relatively near the acquisition site;
- and
- means for evaluating the quality of the substantially deghosted scattered acoustic wavefield.
An apparatus for processing a scattered acoustic wavefield, at least a portion of which is received by at least two receivers offset and located at approximately the same depth comprising:
- a frequency domain transformer;
- a spectral domain transformer;
- a deghoster;
- and
- a space-time domain transformer.
An apparatus for processing a scattered acoustic wavefield received by at least a first set of two receivers and a second set of two receivers, wherein the first set of two receivers are offset at substantially a first depth which is vertically offset from at least a second set of two receivers which are offset at substantially a second depth, the apparatus comprising:
- a first depth frequency domain transformer;
- a second depth frequency domain transformer;
- a first depth spectral domain transformer;
- a second depth spectral domain transformer;
- a deghoster;
- and
- a space-time domain transformer.
A streamer configuration comprising:
- a first seismic streamer;
- a second seismic streamer;
- and
- a third seismic streamer;
- wherein said first seismic streamer, said second seismic streamer, and said third seismic streamer are essentially triangularly positioned relative to one another and wherein the first seismic streamer is not directly above or below the second seismic streamer and wherein the first seismic streamer is not directly above or below the third seismic streamer;
- wherein the second streamer is not directly above or below the third streamer.
An apparatus of controlling the quality of seismic data acquisition at the acquisition site, the apparatus comprising:
- a scattered acoustic wavefield generator;
- a scattered acoustic wavefield receiver;
- a deghoster;
- and
- quality evaluator.
Dependencies are inferred from the claim text.