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Migration

Migration. Intuitive. Least Squares. Green’s Theorem. Migration. Prestack Migration. Question: Why Prestack when poststack migration seems good enough?. Answer: Poststack assumes layered medium assumption. . . +. s x. x g. . . . +.

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Migration

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  1. Migration Intuitive Least Squares Green’s Theorem Migration

  2. Prestack Migration Question: Why Prestack when poststack migration seems good enough? Answer: Poststack assumes layered medium assumption.

  3.  + sx xg    + T(s,g) = s,g sx xg g s   sx xg d(s,g, ) x Diffraction Stack Migration: Prestack Where is scatterer? Narrow band case: direct wave correlated with data

  4. d  d  x’ x’ ~ ~ W( ) W( )=1 ò ò Broadband case d(x’,x,  +  ) = xx’ x’x’’ A(x’’,x’) A(x,x’) 115. Diffraction Stack Migration: Prestack - -     i i * xx’ ~ e x’x’’ e m(x) = d(x’) A(x,x’) A(x’’,x’) .. Narrow band case: direct wave correlated with data

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