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Full Elastic Non-linear Inversion the Key to 4DNormal access

Author: A. Gisolf
Event name: 77th EAGE Conference and Exhibition - Workshops
Session: WS02 - Getting the Most out of 4D - From Reservoir to Surface
Publication date: 01 June 2015
DOI: 10.3997/2214-4609.201413462
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.3Mb )
Price: € 20

Summary:
Usually great emphasis is placed on the repeatability of seismic acquisition for time-lapse purposes. However, the non-linearity of the relationship between seismic time-lapse data differences and time-lapse property changes is usually ignored. In this paper it is demonstrated that ignoring the non-linearity can cause serious errors in time-lapse interpretation, whereas application of full elastic non-linear inversion to base-line and time-lapse surveys separately, fully accounts for the non-linearity and gives quantitatively very accurate results. In addition, it is well understood that full elastic non-linear inversion is less sensitive to noise and acquisition imprint. The method is illustrated with the help of a synthetic time-lapse example based on real logs.


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