The common reflecting element ( CRE ) method revisited

  • Cruz J
  • Hubral P
  • Tygel M
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The common reflecting element (CRE) method is an interesting alternative to the familiar methods of com- mon midpoint (CMP) stack or migration to zero offset (MZO). Like these two methods, theCREmethod aims at constructing a stacked zero-offset section from a set of constant-offset sections. However, it requires no more knowledge about the generally laterally inhomogeneous subsurface model than the near-surface values of the ve- locity field. In addition to being a tool to construct a stacked zero-offset section, theCREmethod simultane- ously obtains information about the laterally inhomoge- neous macrovelocity model.Animportant feature of the CREmethod is that it does not suffer from pulse stretch. Moreover, it gives an alternative solution for conflicting dip problems. In the 1-D case, CRE is closely related to the optical stack. For the price of having to search for two data-derived parameters instead of one, the CRE method provides important advantages over the con- ventional CMP stack. Its results are similar to those of the MZO process, which is commonly implemented as anNMOcorrection followed by a dip moveout (DMO) correction applied to the original constant-offset section. The CRE method is based on 2-D kinematic considera- tions only and is not an amplitude-preserving process

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  • J C R Cruz

  • Peter Hubral

  • Martin Tygel

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