Patents Represented by Attorney S. A. McLean

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  • Migration velocity analysis using limited-aperture and monte carlo migration
    Patent number: 5640368
    Abstract: Disclosed is a method for efficiently and accurately determining subsurface velocities for use in migration of seismic data. The method calls for restricting the number of traces considered to those lying upon that portion of the Kirchhoff summation curve wherein the integrand for Kirchhoff migration is smooth. In the preferred embodiment, only a random sample of traces within this aperture are used in the calculations. Improvements in efficiency on the order of a factor of 1000 can be realized with the preferred embodiment.
    Type: Grant
    Filed: July 26, 1993
    Date of Patent: June 17, 1997
    Assignee: Exxon Production Research Company
    Inventor: Jerome R. Krebs
  • Curved-ray replacement dynamics
    Patent number: 5532976
    Abstract: A method of geophysical prospecting wherein nonhyperbolic distortion is reduced from marine seismic data, or land seismic data over a low seismic velocity layer, is disclosed. The method comprises replacing the seismic velocity of the water or low seismic velocity layer with sediment seismic velocity and using analytic ray tracing to determine a mapping function to correct recorded seismic data for removal of the distortion, which occurs because of the high seismic velocity contrast at the water or low seismic velocity layer.
    Type: Grant
    Filed: July 19, 1994
    Date of Patent: July 2, 1996
    Assignee: Exxon Production Research Company
    Inventor: William A. Schneider, Jr.