Patents by Inventor Toshi Thomas Chang

Toshi Thomas Chang 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: 8259532
    Abstract: A method for generating a synthetic seismogram. In one implementation, the method may include generating a first seismogram in a tau-p domain for a wavefront that moves through an overburden to an upper boundary of a reservoir. The first seismogram is based on a common shot point gather. The method may further include generating a second seismogram in the tau-p domain for the wavefront moving from the upper boundary to a lower boundary of the reservoir and reflected back up to the upper boundary; generating a third seismogram in the tau-p domain for the wavefront moving from the upper boundary of the reservoir through the overburden; and adding the first seismogram in the tau-p domain, the second seismogram in the tau-p domain, and the third seismogram in the tau-p domain.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: September 4, 2012
    Assignee: WesternGeco L.L.C.
    Inventors: Toshi Thomas Chang, Luis Canales, Alfonso Gonzalez
  • Patent number: 8072841
    Abstract: A method for generating a synthetic seismogram. In one implementation, a ray tracing may be performed on a subsurface. The ray tracing may generate a plurality of rays. A first seismic wavefront may be reconstructed by triangulating a first plurality of control points that correspond to the plurality of rays. Each control point may represent an end point of a ray at the first seismic wavefront. The plurality of rays may be propagated to a second seismic wavefront. The second seismic wavefront may have a hole associated with at least one missing ray at the second seismic wavefront. A plurality of points on a circle may be defined that correspond to a second plurality of control points defining the hole. The second seismic wavefront may be reconstructed based on the plurality of points on the circle.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: December 6, 2011
    Assignee: WesternGeco L.L.C.
    Inventors: Toshi Thomas Chang, Luis Canales, Alfonso Gonzalez
  • Publication number: 20100142321
    Abstract: A method for generating a synthetic seismogram. In one implementation, the method may include generating a first seismogram in a tau-p domain for a wavefront that moves through an overburden to an upper boundary of a reservoir. The first seismogram is based on a common shot point gather. The method may further include generating a second seismogram in the tau-p domain for the wavefront moving from the upper boundary to a lower boundary of the reservoir and reflected back up to the upper boundary; generating a third seismogram in the tau-p domain for the wavefront moving from the upper boundary of the reservoir through the overburden; and adding the first seismogram in the tau-p domain, the second seismogram in the tau-p domain, and the third seismogram in the tau-p domain.
    Type: Application
    Filed: December 10, 2008
    Publication date: June 10, 2010
    Inventors: Toshi Thomas Chang, Luis Canales, Alfonso Gonzalez
  • Publication number: 20100142322
    Abstract: A method for generating a synthetic seismogram. In one implementation, a ray tracing may be performed on a subsurface. The ray tracing may generate a plurality of rays. A first seismic wavefront by may be reconstructed by triangulating a first plurality of control points that correspond to the plurality of rays. Each control point may represent an end point of a ray at the first seismic wavefront. The plurality of rays may be propagated to a second seismic wavefront. The second seismic wavefront may have a hole associated with at least one missing ray at the second seismic wavefront. A plurality of points on a circle may be defined that correspond to a second plurality of control points defining the hole. The second seismic wavefront may be reconstructed based on the plurality of points on the circle.
    Type: Application
    Filed: December 10, 2008
    Publication date: June 10, 2010
    Inventors: Toshi Thomas Chang, Luis Canales, Alfonso Gonzalez