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Seismic imaging systems and methods employing tomographic migration-velocity analysis using common angle image gathers

  • US 8,406,081 B2
  • Filed: 09/25/2009
  • Issued: 03/26/2013
  • Est. Priority Date: 09/25/2009
  • Status: Active Grant
First Claim
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1. A seismic imaging method that comprises:

  • obtaining shot gathers for a survey region;

    migrating shot gather data with an initial velocity model to obtain angle-domain common image gathers;

    determining angle-dependent travel time deviations;

    solving a set of tomographic equations that relate the travel time deviations to velocity model updates, wherein said solving includes performing a global least-squares inversion with regularization, subject to geological constraints;

    applying the updates to the velocity model; and

    displaying a representation of the survey region to a user based at least in part on the updated velocity model.

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