Robertsson, GB
Johan Robertsson, Grantchester GB
Patent application number | Description | Published |
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20110044127 | REMOVING FREE-SURFACE EFFECTS FROM SEISMIC DATA ACQUIRED IN A TOWED SURVEY - A technique includes towing a spread of at least one streamer to acquire seismic data in response to energy produced by a seismic source. The technique includes towing the seismic source at least 100 meters behind a front end of the spread to configure the spread to acquire a split spread gather record. | 02-24-2011 |
20120035854 | SEISMIC ACQUISITION SYSTEM INCLUDING A DISTRIBUTED SENSOR HAVING AN OPTICAL FIBER - A seismic acquisition system includes a distributed optical sensor (having an optical fiber) and an interrogation subsystem configured to generate a light signal to emit into the optical fiber. The interrogation subsystem receives, from the distributed optical sensor, backscattered light responsive to the emitted light signal, wherein the backscattered light is affected by one or both of seismic signals reflected from a subterranean structure and noise. Output data corresponding to the backscattered light is provided to a processing subsystem to determine a characteristic of the subterranean structure. | 02-09-2012 |
20120275264 | REMOVING FREE-SURFACE EFFECTS FROM SEISMIC DATA ACQUIRED IN A TOWED SURVEY - A technique includes towing a spread of at least one streamer to acquire seismic data in response to energy produced by a seismic source. The technique includes towing the seismic source at least 100 meters behind a front end of the spread to configure the spread to acquire a split spread gather record. | 11-01-2012 |
Johan Robertsson, Cambridge GB
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20090238036 | DETERMINING DIRECTIONAL PROPAGATION ATTRIBUTES OF A SEISMIC EVENT - A technique includes obtaining seismic data acquired by at least one seismic sensor. The technique includes processing the seismic data to determine a value that is indicative of a three-dimensional directional propagation attribute of a seismic event based on the seismic data. | 09-24-2009 |
Johan O.a. Robertsson, Grantchester GB
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20090296520 | ACQUIRING NEAR ZERO OFFSET SURVEY DATA - To acquire near-zero offset survey data, a survey source and a first streamer attached to the survey source are provided, where the first streamer has at least one survey receiver. A second streamer separate from the survey source and the first streamer includes survey receivers. Near-zero offset data is measured using the at least one survey receiver of the first streamer. | 12-03-2009 |
20120002504 | GRAVITY MEASUREMENTS IN MARINE, LAND AND/OR SEABED SEISMIC APPLICATIONS - A technique facilitates collection and use of data on subterranean formations. The technique comprises creating a distributed sensor network having multiple sensors arranged in a desired pattern. The distributed sensor network is employed to collect seismic data from the multiple sensors. Additionally, the distributed network and sensors are designed to collect gravity data from the multiple sensors. The sensors may be arranged in a variety of environments, including land-based environments and seabed environments. | 01-05-2012 |
Johan O.a. Robertsson, Cambridge GB
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20090092003 | CONTROLLING A SEISMIC SURVEY TO REDUCE THE EFFECTS OF VIBRATION NOISE - A technique includes towing a particle motion sensor in connection with a seismic survey and controlling the survey to cause a notch in a frequency response of the particle motion sensor to substantially coincide with a frequency band at which aliased vibration noise appears in a seismic signal acquisition space of the particle motion sensor. | 04-09-2009 |
20090323467 | SYSTEM AND TECHNIQUE TO OBTAIN STREAMER DEPTH AND SHAPE AND APPLICATIONS THEREOF - A technique includes obtaining first measurements acquired by sensors of a towed seismic streamer, which are indicative of an inclination of the streamer. Based at least in part on the measurements, a shape of the streamer while in tow is determined. | 12-31-2009 |
20110249530 | ARRANGING SENSOR ASSEMBLIES FOR SEISMIC SURVEYING - To perform seismic surveying, a plurality of sensor assemblies are provided, where each of multiple ones of the plurality of sensor assemblies has a seismic sensor and a divergence sensor, and where the divergence sensor is used to measure noise. In addition, the plurality of sensor assemblies are arranged in a layout designed to acquire seismic signals in a target sampling pattern, where the layout is independent of provision of sensor assemblies for noise acquisition. | 10-13-2011 |
Johan O. A. Robertsson, Guantchester GB
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20130100762 | SEISMIC DATA ACQUISITION AND SOURCE-SIDE DERIVATIVES GENERATION AND APPLICATION - The technologies described herein include systems and methods for performing a first seismic survey and performing a second seismic survey after a predetermined amount of time has lapsed between the first seismic survey and the second seismic survey. The shot times and the shot positions of the second seismic survey may be substantially the same as the shot times and the shot positions of the first seismic survey. After performing the seismic surveys, seismic data generated by the first seismic survey may be processed to generate a first image, and seismic data generated by the second seismic survey may be processed to generate a second image. After generating the first and second images, a difference between the first image and the second image may be computed to generate a time lapse difference image. | 04-25-2013 |
Johan O. A. Robertsson, Grantchester GB
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20090067285 | 3D DEGHOSTING OF MULTICOMPONENT OR OVER / UNDER STREAMER RECORDINGS USING CROSS-LINE WAVENUMBER SPECTRA OF HYDROPHONE DATA - A technique includes obtaining pressure data that was acquired by seismic sensors towed as part of a three-dimensional spread of streamers and obtaining particle motion data, which are indicative of particle motion at locations of the sensors. The technique includes estimating cross-line spectra of the pressure data based at least in part on the pressure data, and the technique includes deghosting the particle motion data based at least in part on the estimated cross-line spectra. | 03-12-2009 |
20100265797 | INTERFEROMETRIC SEISMIC DATA PROCESSING - Implementations of various technologies for a method for generating a seismic image of a subsurface are described herein. Seismic data may be received from two sensors in a seismic survey. The seismic data below and equal to a predetermined frequency may be classified as low-frequency seismic data. The low-frequency seismic data may be re-sampled based on the predetermined frequency. A set of low-frequency Green's functions may be calculated using interferometry on the re-sampled low-frequency seismic data. High-frequency seismic data of the seismic data may be processed to create a set of high-frequency Green's functions at one or more source locations of the seismic survey. The set of high-frequency Green's functions may be merged with the set of low-frequency Green's functions to create a set of broad-band Green's functions. The seismic image may be generated using the set of broad-band Green's functions at the source locations. | 10-21-2010 |
20110211423 | Gravity Measurements Using Seismic Streamers - A technique facilitates collection and use of data on subterranean formations. The technique comprises obtaining gravity measurements through the use of seismic streamers. At least one streamer is provided such that each streamer has multiple sensors, e.g. accelerometers. The at least one streamer is towed with a tow vessel, and gravity data are accumulated via the multiple sensors during towing. | 09-01-2011 |
20120020184 | USING A DISTRIBUTED OPTICAL ACOUSTIC SENSOR TO POSITION AN OBJECT - A distributed optical acoustic sensor is provided along a structure in a body of water. The distributed optical acoustic sensor is used to detect acoustic waves generated by at least one acoustic source for positioning of at least one object in relation to the structure. | 01-26-2012 |
20120140592 | 3D DEGHOSTING OF MULTICOMPONENT OR OVER/UNDER STREAMER RECORDINGS USING CROSS-LINE WAVENUMBER SPECTRA OF HYDROPHONE DATA - A technique includes obtaining pressure data that was acquired by seismic sensors towed as part of a three-dimensional spread of streamers and obtaining particle motion data, which are indicative of particle motion at locations of the sensors. The technique includes estimating cross-line spectra of the pressure data based at least in part on the pressure data, and the technique includes deghosting the particle motion data based at least in part on the estimated cross-line spectra. | 06-07-2012 |
20130088939 | WAVEFIELD SEPARATION USING A GRADIENT SENSOR - Seismic data relating to a subterranean structure is received from at least one translational survey sensor, and gradient sensor data is received from at least one gradient sensor. A P wavefield and an S wavefield in the seismic data are separated, based on combining the seismic data and the gradient sensor data. | 04-11-2013 |
Johan O. A. Robertsson, Cambridge GB
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20110075517 | CORRECTING AN ACOUSTIC SIMULATION FOR ELASTIC EFFECTS - A technique includes simulating seismic wave propagation based on an acoustic model and based on a result of the simulation, estimating an error between the result and another result obtained if the seismic wave propagation were simulated based on an elastic model. The technique includes based at least in part on the estimated error predicting the other result without performing the simulation based on the elastic model. | 03-31-2011 |
20110082647 | COMBINING SEISMIC DATA FROM SENSORS TO ATTENUATE NOISE - To perform noise attenuation for seismic surveying, a sensor assembly is deployed on a ground surface, where the sensor assembly has a seismic sensor to measure seismic waves propagated through a subterranean structure, and a divergence sensor comprising a pressure sensor to measure noise. First data is received from the seismic sensor, and second data is received from the divergence sensor. The first data and the second data are combined to attenuate noise in the first data. | 04-07-2011 |
20110310699 | REGULATING COHERENT BOUNDARY REFLECTIONS DURING GENERATION OF A MODELED WAVEFIELD - A technique includes receiving data indicative of a wavefield in a processor-based system and processing the data on the processor-based system to generate a modeled wavefield. The processing includes varying boundary conditions of the modeled wavefield with respect to time to regulate coherent boundary reflections in the modeled wavefield. | 12-22-2011 |
20130107664 | PROCESSING MULTI-COMPONENT SEISMIC DATA | 05-02-2013 |
Johan Olaf Anders Robertsson, Grantchester GB
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20130250721 | MARINE SEISMIC SURVEYING EMPLOYING INTERPOLATED MULTICOMPONENT STREAMER PRESSURE DATA - It is described a method of interpolating and extrapolating seismic recordings, including the steps of deriving particle velocity related data from seismic recordings obtained by at least one streamer carrying a plurality of multi-component receivers and using the particle velocity related data to replace higher derivatives of pressure data in an expansion series. | 09-26-2013 |
Johan Olof Anders Robertsson, Grantchester GB
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20090245021 | RECONSTRUCTING LOW FREQUENCY DATA RECORDINGS USING A SPREAD OF SHALLOW AND DEEP STREAMERS - A technique includes obtaining first data indicative of seismic measurements acquired by seismic sensors of a first set of towed streamers and obtaining second data indicative of seismic measurements acquired by seismic sensors of a second set of towed streamers. The second set of towed streamers is towed at a deeper depth than the first set of towed streamers. The technique includes interpolating seismic measurements based on the first and second data. The interpolation includes assigning more weight to the second data than to the first data for lower frequencies of the interpolated seismic measurements. | 10-01-2009 |
20090290448 | System and Technique to Determine High Order Derivatives from Seismic Sensor Data - A technique includes obtaining multi-component seismic data acquired by two or more seismic sensors while in tow. The multi-component seismic data is indicative of a pressure wavefield and particle motion. The technique includes based on the data, determining at least one high order (i.e., second order or higher) spatial derivative of the pressure wavefield. | 11-26-2009 |
Johan Olof Anders Robertsson, Cambridge GB
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20100135112 | Methods and Apparatus for Acquisition of Marine Seismic Data - Methods and apparatus for acquiring marine seismic data are described. One method comprises selecting tow depth of one or more marine seismic streamers based at least in part on lack of or presence of currents at different depths, and allowing the current to contribute to steering the streamers to desired lateral positions at the selected tow depth. It is emphasized that this abstract is provided to comply with the rules requiring an abstract, which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. | 06-03-2010 |
20120087207 | PROCESSING SEISMIC DATA - A method of monitoring a marine seismic source array comprises, consequent to actuation of a seismic source array ( | 04-12-2012 |
20120095689 | PROCESSING SEISMIC DATA - A method of processing seismic data acquired consequent to actuation of a seismic source is described. The method comprises taking the result of the following process into account when processing the seismic data where the process comprises estimating the effect of uncertainty in the position and/or orientation of the seismic source relative to the measuring receiver on processing the seismic data by estimating a source wavefield from data acquired by a near-field measuring receiver and from a first parameter set including at least one parameter indicative of the position and/or orientation of the seismic source relative to the measuring receiver, varying the value of at least one parameter of the first parameter set, estimating the source wavefield from the data acquired by the measuring receiver and from the varied first parameter set and obtaining information about the uncertainty in the estimate of the source wavefield. | 04-19-2012 |
Johan Olof Anders Robertsson, Cambridgeshire GB
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20100002539 | ZERO-OFFSET SEISMIC TRACE CONSTRUCTION - Described are methods for obtaining seismic signals representative of properties of the earth's interior, including the steps of obtaining near-field acoustic signals recorded in the vicinity of a seismic source ( | 01-07-2010 |