Patents by Inventor Ahmet Kemal Ozdemir

Ahmet Kemal Ozdemir 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: 20150003198
    Abstract: A technique includes modeling interpolated seismic measurements as a random process characterized by seismic measurements acquired at a set of sensor locations and an interpolation error. The technique includes determining the interpolated seismic measurements based at least in part on a minimization of the interpolation error.
    Type: Application
    Filed: September 17, 2014
    Publication date: January 1, 2015
    Inventors: AHMET KEMAL OZDEMIR, ALI OZBEK, MASSIMILIANO VASSALO
  • Publication number: 20140369164
    Abstract: A technique includes spatially filtering a signal that is derived from a seismic acquisition. The filtering is associated with a filter length, and the filtering includes varying the filter length with frequency. The filtering may be used in connection with adaptive noise attenuation, which is applied to decomposed subbands. Furthermore, the filtering may be applied during the reconstruction of the signal from the subbands.
    Type: Application
    Filed: June 19, 2014
    Publication date: December 18, 2014
    Inventors: JAMES EDWARD MARTIN, AHMET KEMAL Ă–ZDEMIR, BENT ANDREAS KJELLESVIG, ALI OZBEK
  • Patent number: 8902705
    Abstract: There is provided a method of spatially shifting seismic signals acquired through a seismic survey using the steps of identifying within the signals a set of N actual locations of seismic receivers and corresponding N seismic signals received by the set of seismic receivers; identifying a set of N? desired locations of seismic receivers; and determining a set of N? signal values at said N? desired locations by evaluating for each of said N? signal values a weighted sum of the N seismic signals, wherein the weights are at least partly determined by the relative distance between pairs of locations selected from said set of N actual locations of seismic receivers.
    Type: Grant
    Filed: October 15, 2007
    Date of Patent: December 2, 2014
    Assignee: WesternGeco L.L.C.
    Inventors: Ali Ozbek, Ahmet Kemal Ozdemir
  • Patent number: 8861306
    Abstract: A technique includes modeling interpolated seismic measurements as a random process characterized by seismic measurements acquired at a set of sensor locations and an interpolation error. The technique includes determining the interpolated seismic measurements based at least in part on a minimization of the interpolation error.
    Type: Grant
    Filed: July 5, 2008
    Date of Patent: October 14, 2014
    Assignee: WesternGeco L.L.C.
    Inventors: Ahmet Kemal Ozdemir, Ali Ozbek, Massimiliano Vassallo
  • Publication number: 20140286127
    Abstract: A technique includes receiving first data acquired by at least a particle motion gradient sensor or a rotation sensor of a streamer that is subject to vibration due to towing of the streamer; and receiving second data acquired by at least one particle motion sensor of the streamer and being indicative of particle motion and vibration noise. The technique includes processing the second data in a processor-based machine to, based at least in part on the first data, attenuate the vibration noise indicated by the second data to generate third data indicative of the particle motion.
    Type: Application
    Filed: March 21, 2013
    Publication date: September 25, 2014
    Applicant: WESTERNGECO L.L.C.
    Inventors: NICOLAS GOUJON, JOHAN O.A. ROBERTSSON, AHMET KEMAL OZDEMIR
  • Publication number: 20140288841
    Abstract: A technique includes using a filter having filtering parameters based at least in part on a dispersion curve of at least one vibration mode of a streamer to filter a measurement acquired by at least one sensor of the streamer and using results of the filtering to suppress vibration noise present in the measurement.
    Type: Application
    Filed: March 19, 2013
    Publication date: September 25, 2014
    Applicant: WESTERNGECO L.L.C.
    Inventors: Ahmet Kemal Ozdemir, Bent Andreas Kjellesvig
  • Patent number: 8773949
    Abstract: A technique includes spatially filtering a signal that is derived from a seismic acquisition. The filtering is associated with a filter length, and the filtering includes varying the filter length with frequency. The filtering may be used in connection with adaptive noise attenuation, which is applied to decomposed subbands. Furthermore, the filtering may be applied during the reconstruction of the signal from the subbands.
    Type: Grant
    Filed: November 3, 2009
    Date of Patent: July 8, 2014
    Assignee: WesternGeco L.L.C.
    Inventors: James Edward Martin, Ahmet Kemal Ozdemir, Bent Andreas Kjellesvig, Ali Ozbek
  • Patent number: 8699297
    Abstract: A technique includes receiving data, which are indicative of measurements acquired by seismic sensors of a seismic wavefield. The seismic wavefield is formed from a combination of an upgoing wavefield and a downgoing wavefield. The technique includes providing a statistical estimator, which relates the upgoing wavefield to a linear combination of the measurements and a reconstruction error. The technique includes determining the upgoing wavefield based on the statistical estimator. The determination includes substantially minimizing a variance of the reconstruction error.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: April 15, 2014
    Assignee: WesternGeco L.L.C.
    Inventors: Ahmet Kemal Ozdemir, Ali Ozbek, Massimiliano Vassallo, Dirk-Jan Van Manen
  • Patent number: 8693282
    Abstract: A technique includes receiving seismic data acquired by seismic sensors; and processing the seismic data on a machine to deghost the data. The processing includes deghosting the seismic data using a first deghosting technique that relies on a ghost model; deghosting the seismic data using a second deghosting technique that is independent from any modeling of the ghost; and selectively combining the results of the deghosting using the first and second deghosting techniques.
    Type: Grant
    Filed: November 24, 2010
    Date of Patent: April 8, 2014
    Assignee: WesternGeco L.L.C.
    Inventors: Ahmet Kemal Ozdemir, Bent Andreas Kjellesvig, Philippe Bernard Albert Caprioli, Philip A. F. Christie, Julian Edward (Ed) Kragh
  • Patent number: 8639442
    Abstract: A method for processing seismic data. The method may include (1) receiving seismic data acquired by an ith seismic sensor of a plurality of seismic sensors and (2) determining an ith value to represent an ith power spectral density curve that corresponds to the seismic data. The method may then repeat steps (1)-(2) for each seismic sensor. The method may then include generating an expected value curve based on the ith value for each power spectral density curve. The method may then compare each ith value to the expected value curve and identify invalid seismic sensors based on the comparison. After identifying the invalid seismic sensors, the method may process the seismic data without seismic data acquired by the invalid seismic sensors to determine one or more locations of hydrocarbon deposits in subterranean geological formations.
    Type: Grant
    Filed: June 24, 2011
    Date of Patent: January 28, 2014
    Assignee: WesternGeco L.L.C.
    Inventors: Ahmet Kemal Ozdemir, Bent Andreas Kjellesvig
  • Patent number: 8625389
    Abstract: A technique includes receiving particle motion data acquired by particle motion sensors while in tow. The particle motion data are indicative of a seismic signal and a torque noise, and the particle motion sensors are oriented to modulate a wavenumber of a first component of the torque noise away from a signal cone that is associated with the seismic signal. The technique includes estimating the first component of the torque noise and based at least in part on the estimated first component, estimating a second component of the torque noise inside the signal cone. The technique includes suppressing the second component of the torque noise based at least in part on the estimated second component.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: January 7, 2014
    Assignee: WesternGeco L.L.C.
    Inventors: Patrick Perciot, Ahmet Kemal Ozdemir, Lars Borgen
  • Publication number: 20130343155
    Abstract: A technique includes distributing particle motion sensors along the length of a seismic streamer. Each particle motion sensor is eccentrically disposed at an associated angle about an axis of the seismic streamer with respect to a reference line that is common to the associated angles. The sensors are mounted to suppress torque noise in measurements that are acquired by the particle motion sensors. This mounting includes substantially varying the associated angles.
    Type: Application
    Filed: August 26, 2013
    Publication date: December 26, 2013
    Applicant: WESTERNGECO L.L.C.
    Inventors: AHMET KEMAL OZDEMIR, OEYVIND TEIGEN, LARS BORGEN
  • Patent number: 8547787
    Abstract: A technique includes distributing particle motion sensors along the length of a seismic streamer. Each particle motion sensor is eccentrically disposed at an associated angle about an axis of the seismic streamer with respect to a reference line that is common to the associated angles. The sensors are mounted to suppress torque noise in measurements that are acquired by the particle motion sensors. This mounting includes substantially varying the associated angles.
    Type: Grant
    Filed: November 3, 2009
    Date of Patent: October 1, 2013
    Assignee: WesternGeco L.L.C.
    Inventors: Ahmet Kemal Ozdemir, Oeyvind Teigen, Lars Borgen
  • Publication number: 20130107664
    Abstract: A technique includes receiving first data indicative of a pressure measurement and measurements of components of a particle motion vector acquired by sensors disposed on at least one cable; and processing the first data to generate second data indicative of a constructed an in-line component of the particle motion vector. The technique includes processing the first and second data in a geophysical processing operation that relies on at least three components of the particle motion vector.
    Type: Application
    Filed: October 26, 2011
    Publication date: May 2, 2013
    Inventors: Nicolas Goujon, Ahmet Kemal Ozdemir, Oeyvind Teigen, Johan O. A. Robertsson
  • Publication number: 20130028050
    Abstract: Measurement data acquired by at least one sensor in a cable structure towed through a body of water is received. A torsional vibration noise component in the measurement data is estimated. The torsional vibration noise component is used to estimate a rotation angle of the at least one survey sensor with respect to a reference coordinate system of the cable structure.
    Type: Application
    Filed: July 29, 2011
    Publication date: January 31, 2013
    Inventors: Ahmet Kemal OZDEMIR, Nicolas Goujon, Oeyvind Teigen, Kenneth E. Welker
  • Publication number: 20120163122
    Abstract: A technique includes decomposing a signal that is derived from a seismic acquisition into a plurality of signals such that each signal is associated with a different frequency band. For each signal of the plurality of signals, the technique includes performing the following: decomposing the signal into subbands in successive stages, where the subbands are associated with at least different frequency ranges of the signal; selectively applying adaptive noise attenuation in between the successive stages such that the stages decompose noise-attenuated subbands; and reconstructing the signal from the subbands resulting from the decomposition. The technique includes combining the reconstructed signals.
    Type: Application
    Filed: December 23, 2010
    Publication date: June 28, 2012
    Inventors: Ahmet Kemal Ozdemir, Bent Andreas Kjellesvig
  • Publication number: 20120130643
    Abstract: A method for processing seismic data. The method may include (1) receiving seismic data acquired by an ith seismic sensor of a plurality of seismic sensors and (2) determining an ith value to represent an ith power spectral density curve that corresponds to the seismic data. The method may then repeat steps (1)-(2) for each seismic sensor. The method may then include generating an expected value curve based on the ith value for each power spectral density curve. The method may then compare each ith value to the expected value curve and identify invalid seismic sensors based on the comparison. After identifying the invalid seismic sensors, the method may process the seismic data without seismic data acquired by the invalid seismic sensors to determine one or more locations of hydrocarbon deposits in subterranean geological formations.
    Type: Application
    Filed: June 24, 2011
    Publication date: May 24, 2012
    Inventors: Ahmet Kemal Ozdemir, Bent Andreas Kjellesvig
  • Publication number: 20120082000
    Abstract: A technique includes receiving particle motion data acquired by particle motion sensors while in tow. The particle motion data are indicative of a seismic signal and a torque noise, and the particle motion sensors are oriented to modulate a wavenumber of a first component of the torque noise away from a signal cone that is associated with the seismic signal. The technique includes estimating the first component of the torque noise and based at least in part on the estimated first component, estimating a second component of the torque noise inside the signal cone. The technique includes suppressing the second component of the torque noise based at least in part on the estimated second component.
    Type: Application
    Filed: October 1, 2010
    Publication date: April 5, 2012
    Inventors: Patrick Perciot, Ahmet Kemal Ozdemir, Lars Borgen
  • Publication number: 20120082001
    Abstract: A technique includes acquiring particle motion data from a plurality of particle motion sensors while in tow during a seismic survey. During the seismic survey, the particle motion data are processed without deghosting the particle motion data to determine whether at least some portion of the particle motion data is inadequate for an application that relies on the particle motion data.
    Type: Application
    Filed: October 1, 2010
    Publication date: April 5, 2012
    Inventors: Kenneth E. Welker, Ahmet Kemal Ozdemir, Espen Gulbransen
  • Patent number: 8136383
    Abstract: To calibrate an accelerometer, a seismic cable that carries the accelerometer is rotated. Data measured by the accelerometer as the seismic cable is rotated is received, and at least one calibration parameter according to the received data is computed. The at least one calibration parameter is for use in calibrating the accelerometer.
    Type: Grant
    Filed: August 17, 2008
    Date of Patent: March 20, 2012
    Assignee: WesternGeco L.L.C.
    Inventors: Nicolas Goujon, Ahmet Kemal Ozdemir, Bent Andreas Kjellesvig