Pre-stack AVO Inversion: What elastic information can be extracted from an ideal AVO data set Tested on a North Sea greensand reservoir model

Gram, Tobias Benjamin, Nielsen, Astrid Katrine Lundsgaard

ISBN 10: 3659331333 / ISBN 13: 9783659331336

Published by LAP LAMBERT Academic Publishing, 2013

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Bibliographic Details

• Title: Pre-stack AVO Inversion: What elastic information can be extracted from an ideal AVO data set Tested on a North Sea greensand reservoir model
• Publisher: LAP LAMBERT Academic Publishing
• Publication Date: 2013
• Language: English
• ISBN 10: 3659331333
• ISBN 13: 9783659331336
• Binding: Paperback
• Condition: Like New
• Book Type: book

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Synopsis

An inversion method based on rejection sampling is developed, with the objective of obtaining posterior distributions of the P-wave velocity, S-wave velocity and density. The inversion algorithm is based on the exact expression of the reflection coefficient from the Zoeppritz equation. The results of inverting directly on the reflection coefficient is compared with inversion algorithms based on the two- and three term Taylor approximation to the Zoeppritz equation, allowing larger contrasts across the reflecting interface. At first, the inversions are compared for a broad limited prior model and subsequently different constraints are applied for a better resolution of the posterior distribution of the P-wave velocity, S-wave velocity and density, including acoustic- and shear impedance and Poisson’s ratio. The inversions are tested for a subsurface three layer model, assuming ideal conditions. Reference values of the P-wave velocity, S-wave velocity and density is interpreted from well logs in the NINI oil field of the North Sea.

About the Author

2010-present: M.Sc. University of Copenhagen2010-2011: M.Sc. Technical University of DenmarkAutumn 2008: B.Sc. University of London2007-2010: B.Sc. University of Copenhagen2011-present: Student assistant at Maersk Oil2009-2012: Student assistant at COWI2008-2011: Student assistant at DMI