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Seismic time-lapse imaging using interferometric least-squares migration: Case studyNormal access

Authors: M. Sinha and G.T. Schuster
Journal name: Geophysical Prospecting
Issue: Vol 66, No 8, October 2018 pp. 1457 - 1474
DOI: 10.1111/1365-2478.12684
Organisations: Wiley
Language: English
Info: Article, PDF ( 20.33Mb )

Summary:
Seismic time-lapse surveys are susceptible to repeatability errors due to varying environmental conditions. To mitigate this problem, we propose the use of interferometric least-squares migration to estimate the migration images for the baseline and monitor surveys. Here, a known reflector is used as the reference reflector for interferometric least-squares migration, and the data are approximately redatumed to this reference reflector before imaging. This virtual redatuming mitigates the repeatability errors in the time-lapse migration image. Results with synthetic and field data show that interferometric least-squares migration can sometimes reduce or eliminate artifacts caused by non-repeatability in time-lapse surveys and provide a high-resolution estimate of the time-lapse change in the reservoir.

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