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Least-Squares Migration Beyond PrimariesNormal access

Authors: N. Chemingui, F. Liu and S. Lu
Event name: First EAGE/SBGf Workshop on Least-Squares Migration
Session: Multiples is LSM I
Publication date: 27 November 2018
DOI: 10.3997/2214-4609.201803058
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 3.74Mb )
Price: € 20

We present a least-squares inversion solution for Full Wavefield Migration (FWM). The algorithm is capable of imaging all reflection modes in the data consisting of primaries and multiples. The inversion approach is key to improving the resolution of seismic images and compensating for the illumination variations due to incomplete acquisitions. The least-squares method also attenuates the artifacts caused by the crosstalk between different orders of reflections. At its core, the inversion uses a Born modelling kernel capable of propagating the full reflection wavefield from seismic records. The algorithm solves for the earth reflectivity by means of data residual reduction in an iterative fashion. Successful applications to field data from different geological settings demonstrate the effectiveness of the solution in imaging the full seismic wavefield beyond primaries.

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