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Extended Subspace Method for Cross-Talk Mitigation in Multi-Parameter Inversion

  • US 20140358504A1
  • Filed: 05/08/2014
  • Published: 12/04/2014
  • Est. Priority Date: 06/03/2013
  • Status: Active Grant
First Claim
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1. A computer-implemented method for iteratively inverting measured geophysical data to infer 3D subsurface models of N≧

  • 2 physical properties, comprising;

    providing an initial model for each physical property, wherein a subsurface region is subdivided into discrete cells, each cell having a value of the physical property;

    for each physical property and for each of a plurality of the cells, representing a search direction, indicating whether the initial model needs to be updated positively or negatively, as a linear combination of M>

    N basis vectors, wherein;

    each basis vector has its own coefficient in the linear combination, said coefficient to be determined;

    the basis vectors are chosen such that their coefficients account for cross-talk between the N physical properties during the inversion; and

    optimal values of the coefficients are simultaneously solved for, using a computer, to minimize or maximize an objective function measuring misfit between model-simulated geophysical data and the measured geophysical data, wherein solving for the coefficients is performed at least by numerical computation constrained by the geophysical data; and

    using the optimal coefficients to generate search directions, and using the search directions to generate an updated model for each physical property.

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