Patents by Inventor Sandra Tegtmeier-Last

Sandra Tegtmeier-Last 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).

  • Patent number: 9588244
    Abstract: A method of attenuating interbed multiples in multiply-reflected seismic waves is performed at a computer system, the method including: providing multiple beams of seismic data and an earth model related to a geological volume; selecting one of the beams as an input beam associated with a pair of source and detector located near a top surface of the geological volume; determining at least one of (i) a source-side stationary pegleg arrival and a corresponding detector-side primary beam and (ii) a detector-side stationary pegleg arrival and a corresponding source-side primary beam; predicting an interbed multiples beam using at least one of (i) the detector-side primary beam delayed by the source-side stationary pegleg arrival and (ii) the source-side primary beam delayed by the detector-side stationary pegleg arrival; and deconvolving the predicted interbed multiples beam with the input beam to remove at least a portion of interbed multiples present in the input beam.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: March 7, 2017
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Tamas Nemeth, Sandra Tegtmeier-Last, N. Ross Hill, Yue Wang, Peeter Akerberg, Shoujian Huang
  • Publication number: 20150032378
    Abstract: A method of attenuating interbed multiples in multiply-reflected seismic waves is performed at a computer system, the method comprising: providing multiple beams of seismic data and an earth model related to a geological volume; selecting one of the beams as an input beam associated with a pair of source and detector located near a top surface of the geological volume; determining at least one of (i) a source-side stationary pegleg arrival and a corresponding detector-side primary beam and (ii) a detector-side stationary pegleg arrival and a corresponding source-side primary beam; predicting an interbed multiples beam using at least one of (i) the detector-side primary beam delayed by the source-side stationary pegleg arrival and (ii) the source-side primary beam delayed by the detector-side stationary pegleg arrival; and deconvolving the predicted interbed multiples beam with the input beam to remove at least a portion of interbed multiples present in the input beam.
    Type: Application
    Filed: July 25, 2013
    Publication date: January 29, 2015
    Applicant: CHEVRON U.S.A. INC.
    Inventors: Tamas Nemeth, Sandra Tegtmeier-Last, N. Ross Hill, Yue Wang, Peeter Akerberg, Shoujian Huang
  • Publication number: 20140278118
    Abstract: A system and method for attenuating noise in seismic data representative of a subsurface region of interest including receiving a seismic dataset representative of seismic signal or seismic noise and a seismic dataset representative of seismic signal and noise, transforming them into a domain were they have sparse or compressible representation, comparing the sets of coefficients to identify desirable coefficients in the set of coefficients representing the signal and noise dataset, selecting the desirable coefficients to produce an improved set of coefficients, and inverse transforming the improved set of coefficients to produce a modified seismic dataset. The modified seismic dataset may be noise-attenuated seismic data or may be a noise model that is subtracted from the original data to produce noise-attenuated data.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: Chevron U.S.A. Inc.
    Inventors: Sandra Tegtmeier-Last, Bogdan Lukasz Kustowski, Douglas William Clark, Gilles Hennenfent, Harry Martin
  • Publication number: 20140269186
    Abstract: A system and method for isolating signal in seismic data representative of a subsurface region of interest including receiving a seismic dataset representative of seismic signal and seismic noise and a seismic data guide; transforming the seismic dataset and the seismic data guide into a domain wherein the seismic data have a sparse or compressible representation to create a first set and a second set of representative coefficients; comparing the first set of representative coefficients to the second set of representative coefficients to identify and select desirable members of the first set of representative coefficients that are within a defined threshold of the second set of representative coefficients to create an improved first set of representative coefficients; and performing an inverse transform of the improved first set of representative coefficients to generate a modified seismic dataset.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: Chevron U.S.A. Inc.
    Inventors: Sandra Tegtmeier-Last, Gilles Hennenfent, Jeffrey Eaton Cole
  • Publication number: 20130253838
    Abstract: A system and method for determining a 4D difference from 4D seismic data including receiving a baseline seismic dataset and a monitor seismic dataset; identifying a 4D signal present in the monitor seismic dataset to create a 4D monitor dataset and a signal in the baseline seismic dataset which matches the monitor seismic dataset to create a baseline matching signal dataset; differencing the baseline matching signal dataset and the baseline seismic dataset to create a 4D baseline dataset; and differencing the 4D baseline dataset and the 4D monitor dataset to create a 4D difference dataset. In an embodiment, a multi-scale, multi-directional transform is used to identify the 4D signal present in the monitor seismic dataset and the signal in the baseline seismic dataset which matches the monitor seismic dataset.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 26, 2013
    Applicant: Chevron U.S.A. Inc.
    Inventors: Sandra Tegtmeier-Last, Gilles Hennenfent