Patents by Inventor Stian Hegna

Stian Hegna 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).

  • Publication number: 20190293817
    Abstract: Noise can be attenuated in marine seismic data from a marine seismic survey. A first near-continuous measurement of a wavefield and a second near-continuous measurement of the wavefield recorded from a marine seismic survey can be equalized, a coherent portion of the equalized second near-continuous measurement can be collapsed, and a noise model can be derived. The noise model can be subtracted from the second near-continuous measurement.
    Type: Application
    Filed: June 11, 2019
    Publication date: September 26, 2019
    Applicant: PGS Geophysical AS
    Inventors: Stian Hegna, Tilman Kluver
  • Patent number: 10401518
    Abstract: Estimation of direct arrival signals based on predicted direct arrival signals and measurements can include obtaining notional source signatures for notional sources that correspond to source elements in a seismic source. A first predicted direct arrival signal at a first location and a second predicted direct arrival signal at a second location can be determined. The first location corresponds to a seismic receiver and the second location does not correspond to a seismic receiver. A transfer function can be determined based on the first predicted direct arrival signal at the first location and the second predicted direct arrival signal at the second location. An estimated direct arrival signal at the second location can be determined based on the transfer function and a measurement by the seismic receiver corresponding to the first location. The estimated direct arrival signal represents what a measured direct arrival signal would be at the second location.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: September 3, 2019
    Assignee: PGS Geophysical AS
    Inventor: Stian Hegna
  • Publication number: 20190235112
    Abstract: Estimating an earth response can include deconvolving a multi-dimensional source wavefield from near-continuously recorded seismic data recorded at a receiver position. The deconvolving can include spreading the near-continuously recorded seismic data across a plurality of possible source emission angles. The result of the deconvolution can be the earth response estimate.
    Type: Application
    Filed: April 10, 2019
    Publication date: August 1, 2019
    Applicant: PGS Geophysical AS
    Inventors: Tilman Kluver, Stian Hegna
  • Patent number: 10338255
    Abstract: Noise can be attenuated in marine seismic data from a marine seismic survey. A first near-continuous measurement of a wavefield and a second near-continuous measurement of the wavefield recorded from a marine seismic survey can be equalized, a coherent portion of the equalized second near-continuous measurement can be collapsed, and a noise model can be derived. The noise model can be subtracted from the second near-continuous measurement.
    Type: Grant
    Filed: January 23, 2017
    Date of Patent: July 2, 2019
    Assignee: PGS Geophysical AS
    Inventors: Stian Hegna, Tilman Kluver
  • Patent number: 10317553
    Abstract: Wavefield separation methods and systems that adjust near-continuous pressure and particle motion wavefields based on distance moved along a vessel track by the sensors when the wavefields were measured are disclosed. Methods and systems correct for the motion of the receivers in towed streamer seismic data in order to obtain a wavefield with approximately stationary-receiver locations. Wavefield separation may then be applied to the wavefield with approximately stationary-receiver locations.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: June 11, 2019
    Assignee: PGS Geophysical AS
    Inventors: Stian Hegna, Gregg Parkes
  • Patent number: 10267936
    Abstract: Estimating an earth response can include deconvolving a multi-dimensional source wavefield from near-continuously recorded seismic data recorded at a receiver position. The deconvolving can include spreading the near-continuously recorded seismic data across a plurality of possible source emission angles. The result of the deconvolution can be the earth response estimate.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: April 23, 2019
    Assignee: PGS Geophysical AS
    Inventors: Tilman Kluver, Stian Hegna
  • Publication number: 20190113645
    Abstract: Techniques are disclosed relating to performing marine surveys with non-uniform spacing of survey elements in a cross-line direction. This may include, for example, performing a survey pass in a multi-pass survey by towing a plurality of sources and sensors in a towing pattern with non-uniform spacing between adjacent ones of the sources. In some embodiments, the non-uniform spacing between adjacent ones of the sources is determined based on a common mid-point (CMP) spacing parameter for the survey pass in the cross-line direction. The spacing parameter may relate, for example, to difference in average CMP spacing for different parts of the survey spread, variance in CMP spacing, and/or width of the survey spread for which a threshold CMP spacing distance is satisfied. In various embodiments, the disclosed techniques may improve survey resolution and/or accuracy and may require a smaller number of survey passes and/or a reduced amount of survey equipment relative to traditional techniques.
    Type: Application
    Filed: October 9, 2018
    Publication date: April 18, 2019
    Inventors: Stian Hegna, Tilman Kluver, Jostein Lima
  • Patent number: 10241218
    Abstract: Methods and systems for computing notional source signatures from modeled notional signatures and measured near-field signatures are described. Modeled near-field signatures are calculated from the modeled notional signatures. Low weights are assigned to parts of a source pressure wavefield spectrum where signatures are less reliable and higher weights are assigned to parts of the source pressure wavefield spectrum where signatures are more reliable. The part of the spectrum where both sets of signatures are reliable can be used for quality control and for comparing the measured near-field signatures to modeled near-field signatures. When there are uncertainties in the input parameters to the modeling, the input parameters can be scaled to minimize the differences between measured and modeled near-field signatures.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: March 26, 2019
    Assignee: PGS Geophysical AS
    Inventors: Stian Hegna, Fabien Julliard
  • Patent number: 10234578
    Abstract: In order to avoid complicated and unpredictable effects on the wavefields emitted by air guns activated at different times, methods and systems of the current disclosure are directed to computationally designing a sequence for activating subsets of air guns in a time distributed manner that minimizes the effects of air in the water surrounding the source. The sequence may be used with discrete and continuously recorded marine surveys.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: March 19, 2019
    Assignee: PGS Geophysical AS
    Inventors: Gregg Parkes, Stian Hegna, Francis Drossaert
  • Patent number: 10132946
    Abstract: Systems and methods to correct source responses and perform source deghosting of a pressure or particle motion wavefield recorded using near-continuous recording of seismic data along a vessel track with generalize source activation times. The methods and systems receive a near-continuously recorded seismic data and generate a near-continuous wavefield for approximately stationary-receiver locations. Time windows of different temporal lengths are applied to traces of the near-continuous wavefield in approximately stationary-receiver locations in order to compute common-receiver gathers. The common-receiver gathers are corrected source wavefield response and source ghost effects and are combined in weighted sums to generate broadband seismic data.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: November 20, 2018
    Assignee: PGS Geophysical AS
    Inventors: Stian Hegna, Gregg Parkes
  • Patent number: 10073183
    Abstract: Methods and systems that attenuate noise in seismic data. In one aspect, noise attenuation methods iteratively generate a low-speed noise model of low-speed noise recorded in the seismic data. The seismic data is arranged into a sparse seismic-data matrix. Low-speed noise refers to noise that propagates at speeds less the speed of sound in water. The low-speed noise model includes the low-speed noise and includes interpolated low-speed noise that approximates portions of the low-speed noise typically affected by spatial aliasing and streamer surface irregularities. The low-speed noise model may be subtracted from the sparse seismic-data matrix to obtain a noise-attenuated sparse seismic-data matrix.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: September 11, 2018
    Assignee: PGS Geophysical AS
    Inventor: Stian Hegna
  • Publication number: 20180143334
    Abstract: A method for seismic data processing can include obtaining seismic data acquired based upon trigger times and not based upon positions of triggered source elements. The seismic data can include near-continuously recorded seismic data in split records. The split records can be spliced together into a single near-continuous record to produce a trace with seismic data from a single acquired line. The seismic data can be processed by performing a spatial shift for each of a number of time samples to correct for motion of a number of seismic receivers.
    Type: Application
    Filed: January 22, 2018
    Publication date: May 24, 2018
    Applicant: PGS Geophysical AS
    Inventors: Stian Hegna, Gregg E. Parkes
  • Publication number: 20180106666
    Abstract: A first portion of electric potentials generated by a first detector and a second detector of a hydrophone can be isolated, wherein the first portion is indicative of particle motion. A second portion of the electric potentials generated by the first detector and the second detector of the hydrophone can be isolated, wherein the second portion is indicative of pressure.
    Type: Application
    Filed: September 14, 2017
    Publication date: April 19, 2018
    Applicant: PGS Geophysical AS
    Inventors: Stig Rune Lennart Tenghamn, Stian Hegna
  • Patent number: 9921325
    Abstract: This disclosure is directed to systems and methods of wavefield separation based on matching operators that represents the relationship between co-located pressure and particle motions sensors. A pressure wavefield and a particle motion wavefield emitted from a subterranean formation are measured using co-located pressure and particle motion sensors located along one or more streamers of a seismic data acquisition system. A matching operator that relates pressure sensor and particle motion sensor responses for co-located pressure and particle motion sensors is computed based on depth of the co-located pressure and particle motion sensors and on the measured pressure and particle motion wavefields. The matching operator and the measured pressure and particle motion wavefields may then be used to compute up-going and down-going wavefields.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: March 20, 2018
    Assignee: PGS Geophysical AS
    Inventors: Stian Hegna, Tilman Kluver
  • Patent number: 9915745
    Abstract: At least some embodiments are directed to a system. The system includes a processor and a memory coupled to the processor. The memory stores a program that, when executed by the processor, causes the processor to calculate a pressure response of a first sensor, and correct pressure wavefield data obtained from the first sensor responsive to a first acoustic wavefield. The correction is based on the calculated pressure response of the first sensor. The pressure response of the first sensor is responsive to a second acoustic wavefield having a propagation path between a source of the second acoustic wavefield and the first sensor, in which the propagation path includes no reflection from a subsurface formation.
    Type: Grant
    Filed: March 30, 2016
    Date of Patent: March 13, 2018
    Assignee: PGS Geophysical AS
    Inventors: Stian Hegna, Tilman Kluver
  • Patent number: 9910063
    Abstract: Included are methods and systems for marine geophysical surveying. A system includes a streamer; a sensor package coupled to the streamer, wherein the sensor package comprises a primary orientation sensor and a complimentary orientation sensor, wherein the complimentary orientation sensor comprises a magnetometer, wherein the primary orientation sensor and the complimentary orientation sensor are capable of collecting data indicative of the orientation of the streamer; and geophysical sensors distributed on the streamer.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: March 6, 2018
    Assignee: PGS Geophysical AS
    Inventors: Gustav Göran Mattias Südow, Stian Hegna
  • Patent number: 9903966
    Abstract: A method for seismic data acquisition can include near-continuously recording seismic data received from a number of seismic receivers and triggering a plurality of source elements, based upon time and not based upon position, at a predefined sequence of times relative to a start of a near-continuous recording.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: February 27, 2018
    Assignee: PGS Geophysical AS
    Inventors: Stian Hegna, Gregg E Parkes
  • Patent number: 9874646
    Abstract: A method for seismic data processing can include obtaining seismic data acquired based upon trigger times and not based upon positions of triggered source elements. The seismic data can include near-continuously recorded seismic data in split records. The split records can be spliced together into a single near-continuous record to produce a trace with seismic data from a single acquired line. The seismic data can be processed by performing a spatial shift for each of a number of time samples to correct for motion of a number of seismic receivers.
    Type: Grant
    Filed: September 19, 2014
    Date of Patent: January 23, 2018
    Assignee: PGS Geophysical AS
    Inventors: Stian Hegna, Gregg E Parkes
  • Patent number: 9851464
    Abstract: In a first embodiment the invention comprises a method for gathering geophysical data, including towing geophysical data gathering equipment behind a survey vessel in a body of water, said equipment including an array of sensor streamers extending behind said vessel, and determining a geodetic location of a streamer steering reference point at a forward end of the sensor streamers and a reference direction. At least one sensor streamer included in said array of sensor streamers is laterally deflected in response to the determined geodetic location of said streamer steering reference point and the determined reference direction.
    Type: Grant
    Filed: July 28, 2014
    Date of Patent: December 26, 2017
    Assignee: PGS Geophysical AS
    Inventors: Øyvind Hillesund, Stian Hegna
  • Publication number: 20170299746
    Abstract: Noise can be attenuated in marine seismic data from a marine seismic survey. A first near-continuous measurement of a wavefield and a second near-continuous measurement of the wavefield recorded from a marine seismic survey can be equalized, a coherent portion of the equalized second near-continuous measurement can be collapsed, and a noise model can be derived. The noise model can be subtracted from the second near-continuous measurement.
    Type: Application
    Filed: January 23, 2017
    Publication date: October 19, 2017
    Applicant: PGS Geophysical AS
    Inventors: Stian Hegna, Tilman Kluver