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AVO Analyses from Four Wells in the West of Shetland - Spectral DecompositionNormal access

Authors: E. Liu, M. Chapman, N. Loizou and X.Y. Li
Event name: 68th EAGE Conference and Exhibition incorporating SPE EUROPEC 2006
Session: AVO-AVA Analysis and Interpretation
Publication date: 12 June 2006
DOI: 10.3997/2214-4609.201401996
Organisations: SPE, EAGE
Language: English
Info: Extended abstract, PDF ( 1.06Mb )
Price: € 20

Summary:
Geological models are currently used to aid AVO-analysis, usually thick-layered. In an actual thin-layered sub-surface medium, the AVO has some specifics, ignoring which may lead to errors in predicting hydrocarbon reservoirs. In the resonant frequency range periodic thin-layered stack, AVO inversion on the basis of the linearized Shuya formula produces an estimate of the effective Poisson coefficient much lower than one of a separate gas-saturated layer. Also, in the low-frequency range an effective Poisson coefficient estimate is much higher than one in case of a separate gas-saturated layer. Within a frequency range close to the resonant frequency (tuning thickness) for a thin-layered stack, favorable conditions occur for predicting multi-layer hydrocarbon reservoirs from the AVO-analysis. At the same time, disregarding absorption may lead to interpretation errors. A finite difference solution for the elastic wave equation and the Haskell-Thomson method in its visco-elastic variant were used to perform the investigation.


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