Patents by Inventor Roald Gunnar van Borselen
Roald Gunnar van Borselen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11698472Abstract: Seismic data are obtained by recording simultaneously in seismic streamer, acquired by activating approximately simultaneously two or more seismic sources towed at two positions in the vicinity of seismic streamers. A residual is updated iteratively for an inversion solution for the activations of the two or more seismic sources. The iterative updating of the residuals utilizes a sequence of overlapping temporal windows containing reflection events and utilizes normal moveout corrections based on largest reflection events in each temporal window. A final updated residual is added to a final updated model result.Type: GrantFiled: January 19, 2021Date of Patent: July 11, 2023Assignee: PGS Geophysical ASInventors: Rolf H. Baardman, Roald Gunnar van Borselen
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Patent number: 11422278Abstract: Computational systems and methods for randomizing the order in which multiple sources are fired in simultaneous source acquisition are described. In one aspect, pseudo-randomly shifted time delays are generated for each shot interval of a marine-survey-time line. Each shifted time delay is assigned to one or the sources. The sources within each shot interval are fired based on the shifted time delays.Type: GrantFiled: November 14, 2018Date of Patent: August 23, 2022Assignee: PGS Geophysical ASInventors: Roald Gunnar van Borselen, Rolf Huibert Baardman
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Publication number: 20210141114Abstract: Seismic data are obtained by recording simultaneously in seismic streamer, acquired by activating approximately simultaneously two or more seismic sources towed at two positions in the vicinity of seismic streamers. A residual is updated iteratively for an inversion solution for the activations of the two or more seismic sources. The iterative updating of the residuals utilizes a sequence of overlapping temporal windows containing reflection events and utilizes normal moveout corrections based on largest reflection events in each temporal window. A final updated residual is added to a final updated model result.Type: ApplicationFiled: January 19, 2021Publication date: May 13, 2021Applicant: PGS Geophysical ASInventors: Rolf H. Baardman, Roald Gunnar van Borselen
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Patent number: 10921473Abstract: Seismic data are obtained by recording simultaneously in seismic streamer, acquired by activating approximately simultaneously two or more seismic sources towed at two positions in the vicinity of seismic streamers. A residual is updated iteratively for an inversion solution for the activations of the two or more seismic sources. The iterative updating of the residuals utilizes a sequence of overlapping temporal windows containing reflection events and utilizes normal moveout corrections based on largest reflection events in each temporal window. A final updated residual is added to a final updated model result.Type: GrantFiled: February 14, 2018Date of Patent: February 16, 2021Assignee: PGS Geophysical ASInventors: Rolf H. Baardman, Roald Gunnar van Borselen
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Patent number: 10359528Abstract: Computational systems and methods for randomizing the order in which multiple sources are fired in simultaneous source acquisition are described. In one aspect, pseudo-randomly shifted time delays are generated for each shot interval of a marine-survey-time line. Each shifted time delay is assigned to one or the sources. The sources within each shot interval are fired based on the shifted time delays.Type: GrantFiled: March 15, 2013Date of Patent: July 23, 2019Assignee: PGS Geophysical ASInventors: Roald Gunnar van Borselen, Rolf Huibert Baardman
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Patent number: 10338250Abstract: Noise is removed from a data set by performing an integral transform operation that converts instances of noise into identifiable artifacts in the transformed data set. A model of the artifacts is constructed by creating a full-domain or partial-domain noise model and performing the same integral transform operation on the noise model. The resulting transformation of the noise model is adaptively subtracted from the transformed data set to remove the noise. The adaptive subtraction may employ a least-square error filter.Type: GrantFiled: May 28, 2013Date of Patent: July 2, 2019Assignee: PGS Geophysical ASInventor: Roald Gunnar Van Borselen
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Patent number: 10261207Abstract: A seismic noise mitigation method. The method comprises identifying a wavenumber of a component in a residual wavenumber spectrum having a largest norm based on a preconditioned residual wavenumber spectrum. A contribution to the residual wavenumber spectrum from the identified wavenumber component, is subtracted therefrom. A next residual wavenumber spectrum is based thereon and a relative residual computed based on that. The identifying, subtracting and calculating are repeated until a first to occur termination condition selected from the group consisting of: a current relative residual is less than a threshold residual; a difference between the current relative residual and a smallest relative residual exceeds product of the smallest relative residual and a preselected threshold factor; and a difference between a current number of iterations and a number of iterations corresponding to a currently encountered smallest relative residual encountered exceeds a preselected threshold number of iterations.Type: GrantFiled: December 18, 2015Date of Patent: April 16, 2019Assignee: PGS Geophysical ASInventors: Andreas Klaedtke, Paolo Terenghi, Roald Gunnar van Borselen, Richard Michael Dyer
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Publication number: 20190086570Abstract: Computational systems and methods for randomizing the order in which multiple sources are fired in simultaneous source acquisition are described. In one aspect, pseudo-randomly shifted time delays are generated for each shot interval of a marine-survey-time line. Each shifted time delay is assigned to one or the sources. The sources within each shot interval are fired based on the shifted time delays.Type: ApplicationFiled: November 14, 2018Publication date: March 21, 2019Applicant: PGS Geophysical ASInventors: Roald Gunnar van Borselen, Rolf Huibert Baardman
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Publication number: 20180172862Abstract: Seismic data are obtained by recording simultaneously in seismic streamer, acquired by activating approximately simultaneously two or more seismic sources towed at two positions in the vicinity of seismic streamers. A residual is updated iteratively for an inversion solution for the activations of the two or more seismic sources. The iterative updating of the residuals utilizes a sequence of overlapping temporal windows containing reflection events and utilizes normal moveout corrections based on largest reflection events in each temporal window. A final updated residual is added to a final updated model result.Type: ApplicationFiled: February 14, 2018Publication date: June 21, 2018Applicant: PGS Geophysical ASInventors: Rolf H. Baardman, Roald Gunnar van Borselen
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Patent number: 9945972Abstract: Seismic data are obtained by recording simultaneously in seismic streamer, acquired by activating approximately simultaneously two or more seismic sources towed at two positions in the vicinity of seismic streamers. A residual is updated iteratively for an inversion solution for the activations of the two or more seismic sources. The iterative updating of the residuals utilizes a sequence of overlapping temporal windows containing reflection events and utilizes normal moveout corrections based on largest reflection events in each temporal window. A final updated residual is added to a final updated model result.Type: GrantFiled: June 24, 2015Date of Patent: April 17, 2018Assignee: PGS Geophysical ASInventors: Rolf H. Baardman, Roald Gunnar van Borselen
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Publication number: 20180017693Abstract: A seismic noise mitigation method. The method comprises identifying a wavenumber of a component in a residual wavenumber spectrum having a largest norm based on a preconditioned residual wavenumber spectrum. A contribution to the residual wavenumber spectrum from the identified wavenumber component, is subtracted therefrom. A next residual wavenumber spectrum is based thereon and a relative residual computed based on that. The identifying, subtracting and calculating are repeated until a first to occur termination condition selected from the group consisting of: a current relative residual is less than a threshold residual; a difference between the current relative residual and a smallest relative residual exceeds product of the smallest relative residual and a preselected threshold factor; and a difference between a current number of iterations and a number of iterations corresponding to a currently encountered smallest relative residual encountered exceeds a preselected threshold number of iterations.Type: ApplicationFiled: December 18, 2015Publication date: January 18, 2018Applicant: PGS Geophysical ASInventors: Andreas Klaedtke, Paolo Terenghi, Roald Gunnar van Borselen, Richard Michael Dyer
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Patent number: 9846247Abstract: Computational systems and methods for interpolating a pressure wavefield based on pressure wavefield and particle motion wavefield data are disclosed. The pressure and particle motion wavefields are sampled at a sample rate that is less than a lower bound for sample rates typically used to interpolate the pressure wavefield from the pressure wavefield samples alone. The particle motion wavefield can an acceleration wavefield or a time derivative of a velocity wavefield.Type: GrantFiled: October 14, 2013Date of Patent: December 19, 2017Assignee: PGS GEOPHYSICAL ASInventors: Roald Gunnar van Borselen, Robertus F. Hegge
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Publication number: 20150293250Abstract: Seismic data are obtained by recording simultaneously in seismic streamer, acquired by activating approximately simultaneously two or more seismic sources towed at two positions in the vicinity of seismic streamers. A residual is updated iteratively for an inversion solution for the activations of the two or more seismic sources. The iterative updating of the residuals utilizes a sequence of overlapping temporal windows containing reflection events and utilizes normal moveout corrections based on largest reflection events in each temporal window. A final updated residual is added to a final updated model result.Type: ApplicationFiled: June 24, 2015Publication date: October 15, 2015Applicant: PGS Geophysical ASInventors: Rolf H. Baardman, Roald Gunnar van Borselen
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Publication number: 20140269169Abstract: Computational systems and methods for randomizing the order in which multiple sources are fired in simultaneous source acquisition are described. In one aspect, pseudo-randomly shifted time delays are generated for each shot interval of a marine-survey-time line. Each shifted time delay is assigned to one or the sources. The sources within each shot interval are fired based on the shifted time delays.Type: ApplicationFiled: March 15, 2013Publication date: September 18, 2014Applicant: PGS Geophysical ASInventors: Roald Gunnar van Borselen, Rolf Huibert Baardman
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Publication number: 20140280416Abstract: Noise is removed from a data set by performing an integral transform operation that converts instances of noise into identifiable artefacts in the transformed data set. A model of the artefacts is constructed by creating a full-domain or partial-domain noise model and performing the same integral transform operation on the noise model. The resulting transformation of the noise model is adaptively subtracted from the transformed data set to remove the noise. The adaptive subtraction may employ a least-square error filter.Type: ApplicationFiled: May 28, 2013Publication date: September 18, 2014Inventor: Roald Gunnar VAN BORSELEN
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Publication number: 20140269181Abstract: Computational systems and methods for interpolating a pressure wavefield based on pressure wavefield and particle motion wavefield data are disclosed. The pressure and particle motion wavefields are sampled at a sample rate that is less than a lower bound for sample rates typically used to interpolate the pressure wavefield from the pressure wavefield samples alone. The particle motion wavefield can an acceleration wavefield or a time derivative of a velocity wavefield.Type: ApplicationFiled: October 14, 2013Publication date: September 18, 2014Applicant: PGS Geophysical ASInventors: Roald Gunnar van Borselen, Robertus F. Hegge
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Publication number: 20130329520Abstract: Techniques are described for predicting surface-related multiples from measurements performed at varying depths. One or more operations, such as wavefield decompositions and/or extrapolations, may be performed on scattered wavefield data obtained by underwater sensors at different underwater depths to determine one or more surface-related multiple wavefield contributions at a selected depth or at the different underwater depths where the scattered wavefield data is collected from measurements.Type: ApplicationFiled: June 11, 2012Publication date: December 12, 2013Applicant: PGS GEOPHYSICAL ASInventor: Roald Gunnar van Borselen
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Patent number: 6751559Abstract: A method is disclosed for attenuating noise from marine seismic signals caused by a noise in the water. The method includes determining an arrival time of a noise event at each of a plurality of seismic sensors, estimating a position of the noise source from the arrival times, and attenuating the noise event from the signals detected by the seismic sensors.Type: GrantFiled: September 10, 2002Date of Patent: June 15, 2004Assignee: PGS Exploration (UK) LimitedInventors: Gregory Peter Gwyn Fookes, Roald Gunnar van Borselen, Jaafar Ali, John Brittan, Jeroen Hubertus Maria Hoogeveen
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Publication number: 20040049347Abstract: A method is disclosed for attenuating noise from marine seismic signals caused by a noise source in the water. The method includes determining an arrival time of a noise event at each of a plurality of seismic sensors, estimating a position of the noise source from the arrival times, and attenuating the noise event from the signals detected by the seismic sensors.Type: ApplicationFiled: September 10, 2002Publication date: March 11, 2004Inventors: Gregory Peter Gwyn Fookes, Roald Gunnar van Borselen, Jaafar Ali, John Brittan, Jeroen Hubertus Maria Hoogeveen