Non-linear orthorhombic AVAZ inversion workflow

Edan Gofer*, Ran Bachrach, Robin Fletcher, Michel Vie

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


In this paper, we present an amplitude variation with azimuth (AVAZ) non-linear orthorhombic inversion workflow. The workflow integrates an inversion based on linearized orthorhombic PP-reflectivity equations and an inversion based on non-linear general Zoeppritz equations. The former is suitable for weak contrasts and the latter valid also for strong interfaces. The strong-contrast orthorhombic AVAZ inversion uses a quasi-Newton solver. Quasi-Newton methods find local minima and, as such, are dependent on the starting model supplied. To provide a good initial model for the non-linear inversion, we propose a workflow that uses the linearized solution. We describe the workflow and demonstrate it on a synthetic example.

Original languageEnglish
Pages (from-to)500-504
Number of pages5
JournalSEG Technical Program Expanded Abstracts
StatePublished - 2016
Externally publishedYes
EventSEG International Exposition and 86th Annual Meeting, SEG 2016 - Dallas, United States
Duration: 16 Oct 201121 Oct 2011


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