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EFFICIENT METHODS OF LINEAR SEARCH IN A COMPLETE WAVE FIELD MULTI-PARAMETRIC INVERSE
EFFICIENT METHODS OF LINEAR SEARCH IN A COMPLETE WAVE FIELD MULTI-PARAMETRIC INVERSE
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机译：完整波场多参数反演中线性搜索的有效方法
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摘要
FIELD: geophysics.;SUBSTANCE: invention relates to geophysics and may be used in seismic data processing. Proposed is a method of complete wave field seismic data simultaneous reversal for numerous classes of parameters of physical properties (for example, speed and anisotropy), including the gradient calculation, that is, the direction of the search, objective function for each class of parameters. Next, the first pass of the independent linear search is performed (preferably, exhaustive) to each parameter class to obtain the corresponding step length in the search direction for each parameter class. Method also includes using the lengths of the steps to set the relative scaling between the gradients of all parameter classes. Further, each scaled search direction is recombined to generate a new search direction, and the second pass of the new linear search is performed in the new search direction, and all parameters are simultaneously updated in accordance with the obtained step length. Unlike the previous alternating two-pass search embodiment, the model can be updated after each linear search first pass and does not perform a linear search second pass for this.;EFFECT: technical result is increasing in accuracy of obtained data.;10 cl, 13 dwg
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