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Onshore Mexico example of least-squares migration for improved imaging and inversionNormal access

Authors: J. Mathewson, C. G. Mayes, J. R. Cervantes, J. H. Villalobos, J.G. Hernandez-Jaime and J. Jurado-Ramirez
Event name: First EAGE/SBGf Workshop on Least-Squares Migration
Session: Case Studies
Publication date: 27 November 2018
DOI: 10.3997/2214-4609.201803069
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 926.2Kb )
Price: € 20

Summary:
In oil exploration today, many easy targets are exhausted and seismic imaging is often relied on in areas that suffer from variable illumination due to complex overburden heterogeneity. At the same time, seismic data are increasingly expected to reveal subsurface rock properties and fluid information. To achieve this, rock physics analysis and property estimation using seismic inversion are essential, but these methods assume that changes in seismic amplitudes reflect changes in lithology, which may not be the case for an onshore seismic dataset formed from a merge of different acquisitions and affected by complex overthrust with large velocity contrasts. In this case study we demonstrate how least-squares migration in the image domain was successful in improving seismic images and inversion results for an onshore Mexico project.


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