Baardman
Rolf Baardman, Rotterdam NL
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20150362610 | METHOD OF SUPPRESSING SPECTRAL ARTEFACTS OF WAVEFIELD DECOMPOSITION CAUSED BY IMPERFECT EXTRAPOLATION - Artefacts arising from imperfect extrapolation of a data set subjected to filtering operation are removed by forming a model of the extrapolated data, performing a filtering process on the model and the data set to form a filtered model and a filtered data set, and adaptively subtracting the filtered model from the filtered data set. The adaptive subtraction may employ a least-square error filter. | 12-17-2015 |
Rolf H. Baardman, Rotterdam NL
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20130121109 | METHOD AND SYSTEM FOR SEPARATING SEISMIC SOURCES IN MARINE SIMULTANEOUS SHOOTING ACQUISITION - Seismic data are obtained by recording simultaneously in seismic streamers, 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 residual 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. | 05-16-2013 |
Rolf H. Baardman, Leiden NL
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20150293250 | METHOD AND SYSEM FOR SEPARATING SEISMIC SOURCES IN MARINE SIMULTANEOUS SHOOTING ACQUISITION - 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. | 10-15-2015 |
Rolf Huibert Baardman, Rotterdam NL
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20140269169 | SYSTEMS AND METHODS FOR RANDOMIZING FIRING TIMES OF SIMULTANEOUS SOURCES IN MARINE SURVEYS - 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. | 09-18-2014 |
20150241587 | METHODS AND SYSTEMS FOR QUANTIFYING COHERENCY AND CONSTRAINING COHERENCY-BASED SEPARATION IN SIMULTANEOUS SHOOTING ACQUISITION - This disclosure presents methods and systems for deblending blended seismic data obtained during simultaneous shooting acquisition into deblended seismic data gathers. Methods and systems iteratively separate the blended seismic data into the deblended seismic data gathers based on semblance analysis of a residual difference between the blended seismic data and the deblended seismic data gathers. Each deblended seismic data gather is associated with one of the sources and appears to have been obtained without substantial interference from seismic energy produced by other sources. | 08-27-2015 |
Rolf Huibert Baardman, Leiden NL
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20150369936 | ESTIMATION OF WATER PROPERTIES FROM SEISMIC DATA - A method for estimation of water properties from seismic data can include determining a number of travel times for at least one event based, at least in part, on predefined values for a plurality of water properties, determining an alignment of data values for each of the number of travel times determined for the at least one event, and determining an estimation of a plurality of undetermined water property values based, at least in part, on the alignment of the data values for each of the number of travel times producing a high quantitative measure of a coherence value. | 12-24-2015 |